inital commit

2021-04-18 19:37:00 +02:00
commit 51b2c91d24
44 changed files with 2782 additions and 0 deletions
--- a/.gitignore
+++ b/.gitignore
@@ -0,0 +1,36 @@
+# built application files
+*.apk
+*.ap_
+
+# Mac files
+.DS_Store
+
+# files for the dex VM
+*.dex
+
+# Java class files
+*.class
+
+# generated files
+bin/
+gen/
+
+# Ignore gradle files
+.gradle/
+build/
+
+# Local configuration file (sdk path, etc)
+local.properties
+
+# Proguard folder generated by Eclipse
+proguard/
+proguard-project.txt
+
+# Eclipse files
+.project
+.classpath
+.settings/
+
+# Android Studio/IDEA
+*.iml
+.idea
--- a/191
+++ b/191
@@ -0,0 +1,191 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
+      publicly display, publicly perform, sublicense, and distribute the
+      Work and such Derivative Works in Source or Object form.
+
+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
+      use, offer to sell, sell, import, and otherwise transfer the Work,
+      where such license applies only to those patent claims licensable
+      by such Contributor that are necessarily infringed by their
+      Contribution(s) alone or by combination of their Contribution(s)
+      with the Work to which such Contribution(s) was submitted. If You
+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
+      modifications, and in Source or Object form, provided that You
+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
+          attribution notices from the Source form of the Work,
+          excluding those notices that do not pertain to any part of
+          the Derivative Works; and
+
+      (d) If the Work includes a "NOTICE" text file as part of its
+          distribution, then any Derivative Works that You distribute must
+          include a readable copy of the attribution notices contained
+          within such NOTICE file, excluding those notices that do not
+          pertain to any part of the Derivative Works, in at least one
+          of the following places: within a NOTICE text file distributed
+          as part of the Derivative Works; within the Source form or
+          documentation, if provided along with the Derivative Works; or,
+          within a display generated by the Derivative Works, if and
+          wherever such third-party notices normally appear. The contents
+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   Copyright 2020 The Android Open Source Project
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+
--- a/README.md
+++ b/README.md
@@ -0,0 +1,36 @@
+
+Android CameraLive
+==================
+
+This app is using the Camera2 API to display the camera preview with a JPEG, DEPTH
+or RAW frame.
+
+Introduction
+------------
+
+The [Camera2 API][1] allows users to capture RAW images, i.e. unprocessed pixel data
+directly from the camera sensor that has not yet been converted into a format and
+colorspace typically used for displaying and storing images viewed by humans.
+
+This app displays a live camera preview in a TextureView and is based on the 
+[Camera2Basic][2] example.
+
+[1]: https://developer.android.com/reference/android/hardware/camera2/package-summary.html
+[2]: https://github.com/android/camera-samples/tree/main/Camera2Basic
+
+Pre-requisites
+--------------
+
+- Android SDK 29+
+- Android Studio 3.5+
+
+Screenshots
+-----------
+
+<img src="screenshots/main.png" height="400" alt="Screenshot"/> 
+
+Getting Started
+---------------
+
+This sample uses the Gradle build system. To build this project, use the
+"gradlew build" command or use "Import Project" in Android Studio.
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -0,0 +1,89 @@
+/*
+ * Copyright 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+apply plugin: 'com.android.application'
+apply plugin: 'kotlin-android'
+apply plugin: 'kotlin-kapt'
+apply plugin: 'kotlin-android-extensions'
+apply plugin: "androidx.navigation.safeargs"
+
+android {
+    compileSdkVersion 29
+    defaultConfig {
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+        applicationId "de.weseng.camera.basic"
+        minSdkVersion 21
+        targetSdkVersion 29
+        versionCode 1
+        versionName "1.0.0"
+    }
+
+    compileOptions {
+        sourceCompatibility rootProject.ext.java_version
+        targetCompatibility rootProject.ext.java_version
+    }
+
+    kotlinOptions {
+        jvmTarget = "$rootProject.ext.java_version"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+dependencies {
+    implementation project(':utils')
+
+    // Kotlin lang
+    implementation 'androidx.core:core-ktx:1.2.0'
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
+    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.3.4'
+
+    // App compat and UI things
+    implementation 'androidx.appcompat:appcompat:1.1.0'
+    implementation 'androidx.lifecycle:lifecycle-runtime-ktx:2.2.0'
+    implementation "androidx.viewpager2:viewpager2:1.0.0"
+    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
+
+    // Navigation library
+    def nav_version = '2.2.2'
+    implementation "androidx.navigation:navigation-fragment-ktx:$nav_version"
+    implementation "androidx.navigation:navigation-ui-ktx:$nav_version"
+
+    // EXIF Interface
+    implementation 'androidx.exifinterface:exifinterface:1.2.0'
+
+    // Glide
+    implementation 'com.github.bumptech.glide:glide:4.11.0'
+    kapt 'com.github.bumptech.glide:compiler:4.11.0'
+
+    // Unit testing
+    testImplementation 'androidx.test.ext:junit:1.1.1'
+    testImplementation 'androidx.test:rules:1.2.0'
+    testImplementation 'androidx.test:runner:1.2.0'
+    testImplementation 'androidx.test.espresso:espresso-core:3.2.0'
+    testImplementation 'org.robolectric:robolectric:4.3.1'
+
+    // Instrumented testing
+    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
+    androidTestImplementation 'androidx.test:rules:1.2.0'
+    androidTestImplementation 'androidx.test:runner:1.2.0'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
+}
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -0,0 +1,49 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ Copyright 2020 The Android Open Source Project
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~     https://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    package="de.weseng.camera.basic">
+
+    <!-- Permission declarations -->
+    <uses-permission android:name="android.permission.CAMERA" />
+
+    <!-- A camera with (optional) RAW capability is required to use this application -->
+    <uses-feature android:name="android.hardware.camera.any" />
+    <uses-feature android:name="android.hardware.camera.raw" android:required="false" />
+
+    <application
+        android:allowBackup="true"
+        android:fullBackupContent="true"
+        android:label="@string/app_name"
+        android:icon="@drawable/ic_launcher"
+        tools:ignore="GoogleAppIndexingWarning">
+
+        <activity
+            android:name="de.weseng.camera.basic.CameraActivity"
+            android:clearTaskOnLaunch="true"
+            android:theme="@style/AppTheme">
+
+            <!-- Main app intent filter -->
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+
+        </activity>
+    </application>
+
+</manifest>
--- a/app/src/main/java/de/weseng/camera/basic/CameraActivity.kt
+++ b/app/src/main/java/de/weseng/camera/basic/CameraActivity.kt
@@ -0,0 +1,58 @@
+/*
+ * Copyright 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package de.weseng.camera.basic
+
+import android.os.Bundle
+import android.view.View
+import android.widget.FrameLayout
+import android.widget.ImageButton
+import androidx.appcompat.app.AppCompatActivity
+
+class CameraActivity : AppCompatActivity() {
+
+    private lateinit var container: FrameLayout
+    private lateinit var captureButton: ImageButton
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_camera)
+        container = findViewById(R.id.fragment_container)
+    }
+
+    override fun onResume() {
+        super.onResume()
+        // Before setting full screen flags, we must wait a bit to let UI settle; otherwise, we may
+        // be trying to set app to immersive mode before it's ready and the flags do not stick
+        container.postDelayed({
+            container.systemUiVisibility = FLAGS_FULLSCREEN
+        }, IMMERSIVE_FLAG_TIMEOUT)
+    }
+
+    companion object {
+        /** Combination of all flags required to put activity into immersive mode */
+        const val FLAGS_FULLSCREEN =
+                View.SYSTEM_UI_FLAG_LOW_PROFILE or
+                        View.SYSTEM_UI_FLAG_FULLSCREEN or
+                        View.SYSTEM_UI_FLAG_LAYOUT_STABLE or
+                        View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
+
+        /** Milliseconds used for UI animations */
+        const val ANIMATION_FAST_MILLIS = 50L
+        const val ANIMATION_SLOW_MILLIS = 100L
+        private const val IMMERSIVE_FLAG_TIMEOUT = 500L
+    }
+}
--- a/app/src/main/java/de/weseng/camera/basic/fragments/CameraFragment.kt
+++ b/app/src/main/java/de/weseng/camera/basic/fragments/CameraFragment.kt
@@ -0,0 +1,487 @@
+/*
+ * Copyright 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package de.weseng.camera.basic.fragments
+
+import android.annotation.SuppressLint
+import android.content.Context
+import android.graphics.Color
+import android.graphics.ImageFormat
+import android.hardware.camera2.CameraCaptureSession
+import android.hardware.camera2.CameraCharacteristics
+import android.hardware.camera2.CameraDevice
+import android.hardware.camera2.CameraManager
+import android.hardware.camera2.CaptureRequest
+import android.hardware.camera2.CaptureResult
+import android.hardware.camera2.DngCreator
+import android.hardware.camera2.TotalCaptureResult
+import android.media.Image
+import android.media.ImageReader
+import android.os.Build
+import android.os.Bundle
+import android.os.Handler
+import android.os.HandlerThread
+import android.util.Log
+import android.view.LayoutInflater
+import android.view.Surface
+import android.view.SurfaceHolder
+import android.view.View
+import android.view.ViewGroup
+import androidx.core.graphics.drawable.toDrawable
+import androidx.exifinterface.media.ExifInterface
+import androidx.fragment.app.Fragment
+import androidx.lifecycle.Observer
+import androidx.lifecycle.lifecycleScope
+import androidx.navigation.NavController
+import androidx.navigation.Navigation
+import androidx.navigation.fragment.navArgs
+import de.weseng.camera.utils.computeExifOrientation
+import de.weseng.camera.utils.getPreviewOutputSize
+import de.weseng.camera.utils.AutoFitSurfaceView
+import de.weseng.camera.utils.OrientationLiveData
+import de.weseng.camera.basic.R
+import de.weseng.camera.basic.CameraActivity
+import kotlinx.android.synthetic.main.fragment_camera.*
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.suspendCancellableCoroutine
+import java.io.Closeable
+import java.io.File
+import java.io.FileOutputStream
+import java.io.IOException
+import java.text.SimpleDateFormat
+import java.util.concurrent.ArrayBlockingQueue
+import java.util.concurrent.TimeoutException
+import java.util.Date
+import java.util.Locale
+import kotlin.RuntimeException
+import kotlin.coroutines.resume
+import kotlin.coroutines.resumeWithException
+import kotlin.coroutines.suspendCoroutine
+
+class CameraFragment : Fragment() {
+
+    /** AndroidX navigation arguments */
+    private val args: CameraFragmentArgs by navArgs()
+
+    /** Host's navigation controller */
+    private val navController: NavController by lazy {
+        Navigation.findNavController(requireActivity(), R.id.fragment_container)
+    }
+
+    /** Detects, characterizes, and connects to a CameraDevice (used for all camera operations) */
+    private val cameraManager: CameraManager by lazy {
+        val context = requireContext().applicationContext
+        context.getSystemService(Context.CAMERA_SERVICE) as CameraManager
+    }
+
+    /** [CameraCharacteristics] corresponding to the provided Camera ID */
+    private val characteristics: CameraCharacteristics by lazy {
+        cameraManager.getCameraCharacteristics(args.cameraId)
+    }
+
+    /** Readers used as buffers for camera still shots */
+    private lateinit var imageReader: ImageReader
+
+    /** [HandlerThread] where all camera operations run */
+    private val cameraThread = HandlerThread("CameraThread").apply { start() }
+
+    /** [Handler] corresponding to [cameraThread] */
+    private val cameraHandler = Handler(cameraThread.looper)
+
+    /** Performs recording animation of flashing screen */
+    private val animationTask: Runnable by lazy {
+        Runnable {
+            // Flash white animation
+            overlay.background = Color.argb(150, 255, 255, 255).toDrawable()
+            // Wait for ANIMATION_FAST_MILLIS
+            overlay.postDelayed({
+                // Remove white flash animation
+                overlay.background = null
+            }, CameraActivity.ANIMATION_FAST_MILLIS)
+        }
+    }
+
+    /** [HandlerThread] where all buffer reading operations run */
+    private val imageReaderThread = HandlerThread("imageReaderThread").apply { start() }
+
+    /** [Handler] corresponding to [imageReaderThread] */
+    private val imageReaderHandler = Handler(imageReaderThread.looper)
+
+    /** Where the camera preview is displayed */
+    private lateinit var viewFinder: AutoFitSurfaceView
+
+    /** Overlay on top of the camera preview */
+    private lateinit var overlay: View
+
+    /** The [CameraDevice] that will be opened in this fragment */
+    private lateinit var camera: CameraDevice
+
+    /** Internal reference to the ongoing [CameraCaptureSession] configured with our parameters */
+    private lateinit var session: CameraCaptureSession
+
+    /** Live data listener for changes in the device orientation relative to the camera */
+    private lateinit var relativeOrientation: OrientationLiveData
+
+    override fun onCreateView(
+            inflater: LayoutInflater,
+            container: ViewGroup?,
+            savedInstanceState: Bundle?
+    ): View? = inflater.inflate(R.layout.fragment_camera, container, false)
+
+    @SuppressLint("MissingPermission")
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        overlay = view.findViewById(R.id.overlay)
+        viewFinder = view.findViewById(R.id.view_finder)
+        capture_button.setOnApplyWindowInsetsListener { v, insets ->
+            v.translationX = (-insets.systemWindowInsetRight).toFloat()
+            v.translationY = (-insets.systemWindowInsetBottom).toFloat()
+            insets.consumeSystemWindowInsets()
+        }
+        capture_button.setVisibility(View.GONE)
+                //captureButton = findViewById(R.id.capture_button)
+                //captureButton.setVisibility(View.GONE))
+
+        viewFinder.holder.addCallback(object : SurfaceHolder.Callback {
+            override fun surfaceDestroyed(holder: SurfaceHolder) = Unit
+
+            override fun surfaceChanged(
+                    holder: SurfaceHolder,
+                    format: Int,
+                    width: Int,
+                    height: Int) = Unit
+
+            override fun surfaceCreated(holder: SurfaceHolder) {
+
+                // Selects appropriate preview size and configures view finder
+                val previewSize = getPreviewOutputSize(
+                        viewFinder.display, characteristics, SurfaceHolder::class.java)
+                Log.d(TAG, "View finder size: ${viewFinder.width} x ${viewFinder.height}")
+                Log.d(TAG, "Selected preview size: $previewSize")
+                viewFinder.setAspectRatio(previewSize.width, previewSize.height)
+
+                // To ensure that size is set, initialize camera in the view's thread
+                view.post { initializeCamera() }
+            }
+        })
+
+        // Used to rotate the output media to match device orientation
+        relativeOrientation = OrientationLiveData(requireContext(), characteristics).apply {
+            observe(viewLifecycleOwner, Observer {
+                orientation -> Log.d(TAG, "Orientation changed: $orientation")
+            })
+        }
+    }
+
+    /**
+     * Begin all camera operations in a coroutine in the main thread. This function:
+     * - Opens the camera
+     * - Configures the camera session
+     * - Starts the preview by dispatching a repeating capture request
+     * - Sets up the still image capture listeners
+     */
+    private fun initializeCamera() = lifecycleScope.launch(Dispatchers.Main) {
+        // Open the selected camera
+        camera = openCamera(cameraManager, args.cameraId, cameraHandler)
+
+        // Initialize an image reader which will be used to capture still photos
+        val size = characteristics.get(
+                CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP)!!
+                .getOutputSizes(args.pixelFormat).maxBy { it.height * it.width }!!
+        imageReader = ImageReader.newInstance(
+                size.width, size.height, args.pixelFormat, IMAGE_BUFFER_SIZE)
+
+        // Creates list of Surfaces where the camera will output frames
+        val targets = listOf(viewFinder.holder.surface, imageReader.surface)
+
+        // Start a capture session using our open camera and list of Surfaces where frames will go
+        session = createCaptureSession(camera, targets, cameraHandler)
+
+        val captureRequest = camera.createCaptureRequest(
+                CameraDevice.TEMPLATE_PREVIEW).apply { addTarget(viewFinder.holder.surface) }
+
+        // This will keep sending the capture request as frequently as possible until the
+        // session is torn down or session.stopRepeating() is called
+        session.setRepeatingRequest(captureRequest.build(), null, cameraHandler)
+
+        // Listen to the capture button
+        capture_button.setOnClickListener {
+
+            // Disable click listener to prevent multiple requests simultaneously in flight
+            it.isEnabled = false
+
+            // Perform I/O heavy operations in a different scope
+            lifecycleScope.launch(Dispatchers.IO) {
+                takePhoto().use { result ->
+                    Log.d(TAG, "Result received: $result")
+
+                    // Save the result to disk
+                    val output = saveResult(result)
+                    Log.d(TAG, "Image saved: ${output.absolutePath}")
+
+                    // If the result is a JPEG file, update EXIF metadata with orientation info
+                    if (output.extension == "jpg") {
+                        val exif = ExifInterface(output.absolutePath)
+                        exif.setAttribute(
+                                ExifInterface.TAG_ORIENTATION, result.orientation.toString())
+                        exif.saveAttributes()
+                        Log.d(TAG, "EXIF metadata saved: ${output.absolutePath}")
+                    }
+
+                    // Display the photo taken to user
+                    lifecycleScope.launch(Dispatchers.Main) {
+                        navController.navigate(CameraFragmentDirections.actionCameraToJpegViewer(output.absolutePath)
+                                .setOrientation(result.orientation)
+                                .setDepth(Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q &&
+                                        result.format == ImageFormat.DEPTH_JPEG))
+                    }
+                }
+
+                // Re-enable click listener after photo is taken
+                it.post { it.isEnabled = true }
+            }
+        }
+    }
+
+    /** Opens the camera and returns the opened device (as the result of the suspend coroutine) */
+    @SuppressLint("MissingPermission")
+    private suspend fun openCamera(
+            manager: CameraManager,
+            cameraId: String,
+            handler: Handler? = null
+    ): CameraDevice = suspendCancellableCoroutine { cont ->
+        manager.openCamera(cameraId, object : CameraDevice.StateCallback() {
+            override fun onOpened(device: CameraDevice) = cont.resume(device)
+
+            override fun onDisconnected(device: CameraDevice) {
+                Log.w(TAG, "Camera $cameraId has been disconnected")
+                requireActivity().finish()
+            }
+
+            override fun onError(device: CameraDevice, error: Int) {
+                val msg = when(error) {
+                    ERROR_CAMERA_DEVICE -> "Fatal (device)"
+                    ERROR_CAMERA_DISABLED -> "Device policy"
+                    ERROR_CAMERA_IN_USE -> "Camera in use"
+                    ERROR_CAMERA_SERVICE -> "Fatal (service)"
+                    ERROR_MAX_CAMERAS_IN_USE -> "Maximum cameras in use"
+                    else -> "Unknown"
+                }
+                val exc = RuntimeException("Camera $cameraId error: ($error) $msg")
+                Log.e(TAG, exc.message, exc)
+                if (cont.isActive) cont.resumeWithException(exc)
+            }
+        }, handler)
+    }
+
+    /**
+     * Starts a [CameraCaptureSession] and returns the configured session (as the result of the
+     * suspend coroutine
+     */
+    private suspend fun createCaptureSession(
+            device: CameraDevice,
+            targets: List<Surface>,
+            handler: Handler? = null
+    ): CameraCaptureSession = suspendCoroutine { cont ->
+
+        // Create a capture session using the predefined targets; this also involves defining the
+        // session state callback to be notified of when the session is ready
+        device.createCaptureSession(targets, object: CameraCaptureSession.StateCallback() {
+
+            override fun onConfigured(session: CameraCaptureSession) = cont.resume(session)
+
+            override fun onConfigureFailed(session: CameraCaptureSession) {
+                val exc = RuntimeException("Camera ${device.id} session configuration failed")
+                Log.e(TAG, exc.message, exc)
+                cont.resumeWithException(exc)
+            }
+        }, handler)
+    }
+
+    /**
+     * Helper function used to capture a still image using the [CameraDevice.TEMPLATE_STILL_CAPTURE]
+     * template. It performs synchronization between the [CaptureResult] and the [Image] resulting
+     * from the single capture, and outputs a [CombinedCaptureResult] object.
+     */
+    private suspend fun takePhoto():
+            CombinedCaptureResult = suspendCoroutine { cont ->
+
+        // Flush any images left in the image reader
+        @Suppress("ControlFlowWithEmptyBody")
+        while (imageReader.acquireNextImage() != null) {}
+
+        // Start a new image queue
+        val imageQueue = ArrayBlockingQueue<Image>(IMAGE_BUFFER_SIZE)
+        imageReader.setOnImageAvailableListener({ reader ->
+            val image = reader.acquireNextImage()
+            Log.d(TAG, "Image available in queue: ${image.timestamp}")
+            imageQueue.add(image)
+        }, imageReaderHandler)
+
+        val captureRequest = session.device.createCaptureRequest(
+                CameraDevice.TEMPLATE_STILL_CAPTURE).apply { addTarget(imageReader.surface) }
+        session.capture(captureRequest.build(), object : CameraCaptureSession.CaptureCallback() {
+
+            override fun onCaptureStarted(
+                    session: CameraCaptureSession,
+                    request: CaptureRequest,
+                    timestamp: Long,
+                    frameNumber: Long) {
+                super.onCaptureStarted(session, request, timestamp, frameNumber)
+                viewFinder.post(animationTask)
+            }
+
+            override fun onCaptureCompleted(
+                    session: CameraCaptureSession,
+                    request: CaptureRequest,
+                    result: TotalCaptureResult) {
+                super.onCaptureCompleted(session, request, result)
+                val resultTimestamp = result.get(CaptureResult.SENSOR_TIMESTAMP)
+                Log.d(TAG, "Capture result received: $resultTimestamp")
+
+                // Set a timeout in case image captured is dropped from the pipeline
+                val exc = TimeoutException("Image dequeuing took too long")
+                val timeoutRunnable = Runnable { cont.resumeWithException(exc) }
+                imageReaderHandler.postDelayed(timeoutRunnable, IMAGE_CAPTURE_TIMEOUT_MILLIS)
+
+                // Loop in the coroutine's context until an image with matching timestamp comes
+                // We need to launch the coroutine context again because the callback is done in
+                //  the handler provided to the `capture` method, not in our coroutine context
+                @Suppress("BlockingMethodInNonBlockingContext")
+                lifecycleScope.launch(cont.context) {
+                    while (true) {
+
+                        // Dequeue images while timestamps don't match
+                        val image = imageQueue.take()
+                        // TODO(owahltinez): b/142011420
+                        // if (image.timestamp != resultTimestamp) continue
+                        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q &&
+                                image.format != ImageFormat.DEPTH_JPEG &&
+                                image.timestamp != resultTimestamp) continue
+                         Log.d(TAG, "Matching image dequeued: ${image.timestamp}")
+
+                        // Unset the image reader listener
+                        imageReaderHandler.removeCallbacks(timeoutRunnable)
+                        imageReader.setOnImageAvailableListener(null, null)
+
+                        // Clear the queue of images, if there are left
+                        while (imageQueue.size > 0) {
+                            imageQueue.take().close()
+                        }
+
+                        // Compute EXIF orientation metadata
+                        val rotation = relativeOrientation.value ?: 0
+                        val mirrored = characteristics.get(CameraCharacteristics.LENS_FACING) ==
+                                CameraCharacteristics.LENS_FACING_FRONT
+                        val exifOrientation = computeExifOrientation(rotation, mirrored)
+
+                        // Build the result and resume progress
+                        cont.resume(CombinedCaptureResult(
+                                image, result, exifOrientation, imageReader.imageFormat))
+
+                        // There is no need to break out of the loop, this coroutine will suspend
+                    }
+                }
+            }
+        }, cameraHandler)
+    }
+
+    /** Helper function used to save a [CombinedCaptureResult] into a [File] */
+    private suspend fun saveResult(result: CombinedCaptureResult): File = suspendCoroutine { cont ->
+        when (result.format) {
+
+            // When the format is JPEG or DEPTH JPEG we can simply save the bytes as-is
+            ImageFormat.JPEG, ImageFormat.DEPTH_JPEG -> {
+                val buffer = result.image.planes[0].buffer
+                val bytes = ByteArray(buffer.remaining()).apply { buffer.get(this) }
+                try {
+                    val output = createFile(requireContext(), "jpg")
+                    FileOutputStream(output).use { it.write(bytes) }
+                    cont.resume(output)
+                } catch (exc: IOException) {
+                    Log.e(TAG, "Unable to write JPEG image to file", exc)
+                    cont.resumeWithException(exc)
+                }
+            }
+
+            // When the format is RAW we use the DngCreator utility library
+            ImageFormat.RAW_SENSOR -> {
+                val dngCreator = DngCreator(characteristics, result.metadata)
+                try {
+                    val output = createFile(requireContext(), "dng")
+                    FileOutputStream(output).use { dngCreator.writeImage(it, result.image) }
+                    cont.resume(output)
+                } catch (exc: IOException) {
+                    Log.e(TAG, "Unable to write DNG image to file", exc)
+                    cont.resumeWithException(exc)
+                }
+            }
+
+            // No other formats are supported by this sample
+            else -> {
+                val exc = RuntimeException("Unknown image format: ${result.image.format}")
+                Log.e(TAG, exc.message, exc)
+                cont.resumeWithException(exc)
+            }
+        }
+    }
+
+    override fun onStop() {
+        super.onStop()
+        try {
+            camera.close()
+        } catch (exc: Throwable) {
+            Log.e(TAG, "Error closing camera", exc)
+        }
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        cameraThread.quitSafely()
+        imageReaderThread.quitSafely()
+    }
+
+    companion object {
+        private val TAG = CameraFragment::class.java.simpleName
+
+        /** Maximum number of images that will be held in the reader's buffer */
+        private const val IMAGE_BUFFER_SIZE: Int = 3
+
+        /** Maximum time allowed to wait for the result of an image capture */
+        private const val IMAGE_CAPTURE_TIMEOUT_MILLIS: Long = 5000
+
+        /** Helper data class used to hold capture metadata with their associated image */
+        data class CombinedCaptureResult(
+                val image: Image,
+                val metadata: CaptureResult,
+                val orientation: Int,
+                val format: Int
+        ) : Closeable {
+            override fun close() = image.close()
+        }
+
+        /**
+         * Create a [File] named a using formatted timestamp with the current date and time.
+         *
+         * @return [File] created.
+         */
+        private fun createFile(context: Context, extension: String): File {
+            val sdf = SimpleDateFormat("yyyy_MM_dd_HH_mm_ss_SSS", Locale.US)
+            return File(context.filesDir, "IMG_${sdf.format(Date())}.$extension")
+        }
+    }
+}
--- a/app/src/main/java/de/weseng/camera/basic/fragments/ImageViewerFragment.kt
+++ b/app/src/main/java/de/weseng/camera/basic/fragments/ImageViewerFragment.kt
@@ -0,0 +1,176 @@
+/*
+ * Copyright 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package de.weseng.camera.basic.fragments
+
+import android.graphics.Bitmap
+import android.graphics.BitmapFactory
+import android.graphics.Matrix
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.util.Log
+import android.view.ViewGroup.LayoutParams.MATCH_PARENT
+import android.widget.ImageView
+import androidx.fragment.app.Fragment
+import androidx.lifecycle.lifecycleScope
+import androidx.navigation.fragment.navArgs
+import androidx.viewpager2.widget.ViewPager2
+import com.bumptech.glide.Glide
+import de.weseng.camera.utils.GenericListAdapter
+import de.weseng.camera.utils.decodeExifOrientation
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
+import java.io.BufferedInputStream
+import java.io.File
+import kotlin.math.max
+
+
+class ImageViewerFragment : Fragment() {
+
+    /** AndroidX navigation arguments */
+    private val args: ImageViewerFragmentArgs by navArgs()
+
+    /** Default Bitmap decoding options */
+    private val bitmapOptions = BitmapFactory.Options().apply {
+        inJustDecodeBounds = false
+        // Keep Bitmaps at less than 1 MP
+        if (max(outHeight, outWidth) > DOWNSAMPLE_SIZE) {
+            val scaleFactorX = outWidth / DOWNSAMPLE_SIZE + 1
+            val scaleFactorY = outHeight / DOWNSAMPLE_SIZE + 1
+            inSampleSize = max(scaleFactorX, scaleFactorY)
+        }
+    }
+
+    /** Bitmap transformation derived from passed arguments */
+    private val bitmapTransformation: Matrix by lazy { decodeExifOrientation(args.orientation) }
+
+    /** Flag indicating that there is depth data available for this image */
+    private val isDepth: Boolean by lazy { args.depth }
+
+    /** Data backing our Bitmap viewpager */
+    private val bitmapList: MutableList<Bitmap> = mutableListOf()
+
+    private fun imageViewFactory() = ImageView(requireContext()).apply {
+        layoutParams = ViewGroup.LayoutParams(MATCH_PARENT, MATCH_PARENT)
+    }
+
+    override fun onCreateView(
+            inflater: LayoutInflater,
+            container: ViewGroup?,
+            savedInstanceState: Bundle?
+    ): View? = ViewPager2(requireContext()).apply {
+        // Populate the ViewPager and implement a cache of two media items
+        offscreenPageLimit = 2
+        adapter = GenericListAdapter(
+                bitmapList,
+                itemViewFactory = { imageViewFactory() }) { view, item, _ ->
+            view as ImageView
+            Glide.with(view).load(item).into(view)
+        }
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        view as ViewPager2
+        lifecycleScope.launch(Dispatchers.IO) {
+
+            // Load input image file
+            val inputBuffer = loadInputBuffer()
+
+            // Load the main JPEG image
+            addItemToViewPager(view, decodeBitmap(inputBuffer, 0, inputBuffer.size))
+
+            // If we have depth data attached, attempt to load it
+            if (isDepth) {
+                try {
+                    val depthStart = findNextJpegEndMarker(inputBuffer, 2)
+                    addItemToViewPager(view, decodeBitmap(
+                            inputBuffer, depthStart, inputBuffer.size - depthStart))
+
+                    val confidenceStart = findNextJpegEndMarker(inputBuffer, depthStart)
+                    addItemToViewPager(view, decodeBitmap(
+                            inputBuffer, confidenceStart, inputBuffer.size - confidenceStart))
+
+                } catch (exc: RuntimeException) {
+                    Log.e(TAG, "Invalid start marker for depth or confidence data")
+                }
+            }
+        }
+    }
+
+    /** Utility function used to read input file into a byte array */
+    private fun loadInputBuffer(): ByteArray {
+        val inputFile = File(args.filePath)
+        return BufferedInputStream(inputFile.inputStream()).let { stream ->
+            ByteArray(stream.available()).also {
+                stream.read(it)
+                stream.close()
+            }
+        }
+    }
+
+    /** Utility function used to add an item to the viewpager and notify it, in the main thread */
+    private fun addItemToViewPager(view: ViewPager2, item: Bitmap) = view.post {
+        bitmapList.add(item)
+        view.adapter!!.notifyDataSetChanged()
+    }
+
+    /** Utility function used to decode a [Bitmap] from a byte array */
+    private fun decodeBitmap(buffer: ByteArray, start: Int, length: Int): Bitmap {
+
+        // Load bitmap from given buffer
+        val bitmap = BitmapFactory.decodeByteArray(buffer, start, length, bitmapOptions)
+
+        // Transform bitmap orientation using provided metadata
+        return Bitmap.createBitmap(
+                bitmap, 0, 0, bitmap.width, bitmap.height, bitmapTransformation, true)
+    }
+
+    companion object {
+        private val TAG = ImageViewerFragment::class.java.simpleName
+
+        /** Maximum size of [Bitmap] decoded */
+        private const val DOWNSAMPLE_SIZE: Int = 1024  // 1MP
+
+        /** These are the magic numbers used to separate the different JPG data chunks */
+        private val JPEG_DELIMITER_BYTES = arrayOf(-1, -39)
+
+        /**
+         * Utility function used to find the markers indicating separation between JPEG data chunks
+         */
+        private fun findNextJpegEndMarker(jpegBuffer: ByteArray, start: Int): Int {
+
+            // Sanitize input arguments
+            assert(start >= 0) { "Invalid start marker: $start" }
+            assert(jpegBuffer.size > start) {
+                "Buffer size (${jpegBuffer.size}) smaller than start marker ($start)" }
+
+            // Perform a linear search until the delimiter is found
+            for (i in start until jpegBuffer.size - 1) {
+                if (jpegBuffer[i].toInt() == JPEG_DELIMITER_BYTES[0] &&
+                        jpegBuffer[i + 1].toInt() == JPEG_DELIMITER_BYTES[1]) {
+                    return i + 2
+                }
+            }
+
+            // If we reach this, it means that no marker was found
+            throw RuntimeException("Separator marker not found in buffer (${jpegBuffer.size})")
+        }
+    }
+}
--- a/app/src/main/java/de/weseng/camera/basic/fragments/PermissionsFragment.kt
+++ b/app/src/main/java/de/weseng/camera/basic/fragments/PermissionsFragment.kt
@@ -0,0 +1,71 @@
+/*
+ * Copyright 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package de.weseng.camera.basic.fragments
+
+import android.Manifest
+import android.content.Context
+import android.content.pm.PackageManager
+import android.os.Bundle
+import android.widget.Toast
+import androidx.core.content.ContextCompat
+import androidx.fragment.app.Fragment
+import androidx.navigation.Navigation
+import de.weseng.camera.basic.R
+
+private const val PERMISSIONS_REQUEST_CODE = 10
+private val PERMISSIONS_REQUIRED = arrayOf(Manifest.permission.CAMERA)
+
+/**
+ * This [Fragment] requests permissions and, once granted, it will navigate to the next fragment
+ */
+class PermissionsFragment : Fragment() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        if (hasPermissions(requireContext())) {
+            // If permissions have already been granted, proceed
+            Navigation.findNavController(requireActivity(), R.id.fragment_container).navigate(
+                    PermissionsFragmentDirections.actionPermissionsToSelector())
+        } else {
+            // Request camera-related permissions
+            requestPermissions(PERMISSIONS_REQUIRED, PERMISSIONS_REQUEST_CODE)
+        }
+    }
+
+    override fun onRequestPermissionsResult(
+            requestCode: Int, permissions: Array<String>, grantResults: IntArray) {
+        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
+        if (requestCode == PERMISSIONS_REQUEST_CODE) {
+            if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
+                // Takes the user to the success fragment when permission is granted
+                Navigation.findNavController(requireActivity(), R.id.fragment_container).navigate(
+                        PermissionsFragmentDirections.actionPermissionsToSelector())
+            } else {
+                Toast.makeText(context, "Permission request denied", Toast.LENGTH_LONG).show()
+            }
+        }
+    }
+
+    companion object {
+
+        /** Convenience method used to check if all permissions required by this app are granted */
+        fun hasPermissions(context: Context) = PERMISSIONS_REQUIRED.all {
+            ContextCompat.checkSelfPermission(context, it) == PackageManager.PERMISSION_GRANTED
+        }
+    }
+}
--- a/app/src/main/java/de/weseng/camera/basic/fragments/SelectorFragment.kt
+++ b/app/src/main/java/de/weseng/camera/basic/fragments/SelectorFragment.kt
@@ -0,0 +1,134 @@
+/*
+ * Copyright 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package de.weseng.camera.basic.fragments
+
+import android.annotation.SuppressLint
+import android.content.Context
+import android.graphics.ImageFormat
+import android.hardware.camera2.CameraCharacteristics
+import android.hardware.camera2.CameraManager
+import android.hardware.camera2.CameraMetadata
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.TextView
+import androidx.fragment.app.Fragment
+import androidx.navigation.Navigation
+import androidx.recyclerview.widget.LinearLayoutManager
+import androidx.recyclerview.widget.RecyclerView
+import de.weseng.camera.basic.R
+import de.weseng.camera.utils.GenericListAdapter
+
+class SelectorFragment : Fragment() {
+
+    override fun onCreateView(
+            inflater: LayoutInflater,
+            container: ViewGroup?,
+            savedInstanceState: Bundle?
+    ): View? = RecyclerView(requireContext())
+
+    @SuppressLint("MissingPermission")
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        view as RecyclerView
+        view.apply {
+            layoutManager = LinearLayoutManager(requireContext())
+
+            val cameraManager =
+                    requireContext().getSystemService(Context.CAMERA_SERVICE) as CameraManager
+
+            val cameraList = enumerateCameras(cameraManager)
+
+            val layoutId = android.R.layout.simple_list_item_1
+            adapter = GenericListAdapter(cameraList, itemLayoutId = layoutId) { view, item, _ ->
+                view.findViewById<TextView>(android.R.id.text1).text = item.title
+                view.setOnClickListener {
+                    Navigation.findNavController(requireActivity(), R.id.fragment_container)
+                            .navigate(SelectorFragmentDirections.actionSelectorToCamera(
+                                    item.cameraId, item.format))
+                }
+            }
+        }
+
+    }
+
+    companion object {
+
+        /** Helper class used as a data holder for each selectable camera format item */
+        private data class FormatItem(val title: String, val cameraId: String, val format: Int)
+
+        /** Helper function used to convert a lens orientation enum into a human-readable string */
+        private fun lensOrientationString(value: Int) = when(value) {
+            CameraCharacteristics.LENS_FACING_BACK -> "Back"
+            CameraCharacteristics.LENS_FACING_FRONT -> "Front"
+            CameraCharacteristics.LENS_FACING_EXTERNAL -> "External"
+            else -> "Unknown"
+        }
+
+        /** Helper function used to list all compatible cameras and supported pixel formats */
+        @SuppressLint("InlinedApi")
+        private fun enumerateCameras(cameraManager: CameraManager): List<FormatItem> {
+            val availableCameras: MutableList<FormatItem> = mutableListOf()
+
+            // Get list of all compatible cameras
+            val cameraIds = cameraManager.cameraIdList.filter {
+                val characteristics = cameraManager.getCameraCharacteristics(it)
+                val capabilities = characteristics.get(
+                        CameraCharacteristics.REQUEST_AVAILABLE_CAPABILITIES)
+                capabilities?.contains(
+                        CameraMetadata.REQUEST_AVAILABLE_CAPABILITIES_BACKWARD_COMPATIBLE) ?: false
+            }
+
+
+            // Iterate over the list of cameras and return all the compatible ones
+            cameraIds.forEach { id ->
+                val characteristics = cameraManager.getCameraCharacteristics(id)
+                val orientation = lensOrientationString(
+                        characteristics.get(CameraCharacteristics.LENS_FACING)!!)
+
+                // Query the available capabilities and output formats
+                val capabilities = characteristics.get(
+                        CameraCharacteristics.REQUEST_AVAILABLE_CAPABILITIES)!!
+                val outputFormats = characteristics.get(
+                        CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP)!!.outputFormats
+
+                // All cameras *must* support JPEG output so we don't need to check characteristics
+                availableCameras.add(FormatItem(
+                        "$orientation JPEG ($id)", id, ImageFormat.JPEG))
+
+                // Return cameras that support RAW capability
+                if (capabilities.contains(
+                                CameraCharacteristics.REQUEST_AVAILABLE_CAPABILITIES_RAW) &&
+                        outputFormats.contains(ImageFormat.RAW_SENSOR)) {
+                    availableCameras.add(FormatItem(
+                            "$orientation RAW ($id)", id, ImageFormat.RAW_SENSOR))
+                }
+
+                // Return cameras that support JPEG DEPTH capability
+                if (capabilities.contains(
+                            CameraCharacteristics.REQUEST_AVAILABLE_CAPABILITIES_DEPTH_OUTPUT) &&
+                        outputFormats.contains(ImageFormat.DEPTH_JPEG)) {
+                    availableCameras.add(FormatItem(
+                            "$orientation DEPTH ($id)", id, ImageFormat.DEPTH_JPEG))
+                }
+            }
+
+            return availableCameras
+        }
+    }
+}
--- a/app/src/main/res/drawable-hdpi/ic_launcher.png
+++ b/app/src/main/res/drawable-hdpi/ic_launcher.png
--- a/app/src/main/res/drawable-mdpi/ic_launcher.png
+++ b/app/src/main/res/drawable-mdpi/ic_launcher.png
--- a/app/src/main/res/drawable-xhdpi/ic_launcher.png
+++ b/app/src/main/res/drawable-xhdpi/ic_launcher.png
--- a/app/src/main/res/drawable-xxhdpi/ic_launcher.png
+++ b/app/src/main/res/drawable-xxhdpi/ic_launcher.png
--- a/app/src/main/res/drawable/ic_photo.xml
+++ b/app/src/main/res/drawable/ic_photo.xml
@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright 2020 The Android Open Source Project
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~     https://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24.0"
+    android:viewportHeight="24.0">
+    <path
+        android:fillColor="#000000"
+        android:pathData="M21,19V5c0,-1.1 -0.9,-2 -2,-2H5c-1.1,0 -2,0.9 -2,2v14c0,1.1 0.9,2 2,2h14c1.1,0 2,-0.9 2,-2zM8.5,13.5l2.5,3.01L14.5,12l4.5,6H5l3.5,-4.5z"/>
+</vector>
--- a/app/src/main/res/layout-land/fragment_camera.xml
+++ b/app/src/main/res/layout-land/fragment_camera.xml
@@ -0,0 +1,42 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright 2020 The Android Open Source Project
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~     https://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+<FrameLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <de.weseng.camera.utils.AutoFitSurfaceView
+        android:id="@+id/view_finder"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+
+    <View
+        android:id="@+id/overlay"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:foreground="@android:color/transparent" />
+
+    <ImageButton
+        android:id="@+id/capture_button"
+        android:layout_width="96dp"
+        android:layout_height="96dp"
+        android:layout_gravity="center|right"
+        android:scaleType="fitCenter"
+        android:background="@drawable/ic_shutter"
+        android:contentDescription="@string/capture" />
+
+</FrameLayout>
--- a/app/src/main/res/layout/activity_camera.xml
+++ b/app/src/main/res/layout/activity_camera.xml
@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright 2020 The Android Open Source Project
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~     https://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+<androidx.fragment.app.FragmentContainerView
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:id="@+id/fragment_container"
+    android:name="androidx.navigation.fragment.NavHostFragment"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:keepScreenOn="true"
+    app:defaultNavHost="true"
+    app:navGraph="@navigation/nav_graph"
+    tools:context="de.weseng.camera.basic.CameraActivity" />
--- a/app/src/main/res/layout/fragment_camera.xml
+++ b/app/src/main/res/layout/fragment_camera.xml
@@ -0,0 +1,42 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright 2020 The Android Open Source Project
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~     https://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+<FrameLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <de.weseng.camera.utils.AutoFitSurfaceView
+        android:id="@+id/view_finder"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+
+    <View
+        android:id="@+id/overlay"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:foreground="@android:color/transparent" />
+
+    <ImageButton
+        android:id="@+id/capture_button"
+        android:layout_width="96dp"
+        android:layout_height="96dp"
+        android:layout_gravity="bottom|center"
+        android:scaleType="fitCenter"
+        android:background="@drawable/ic_shutter"
+        android:contentDescription="@string/capture" />
+
+</FrameLayout>
--- a/app/src/main/res/navigation/nav_graph.xml
+++ b/app/src/main/res/navigation/nav_graph.xml
@@ -0,0 +1,97 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright 2020 The Android Open Source Project
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~     https://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+<navigation
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:id="@+id/nav_graph"
+    app:startDestination="@id/permissions_fragment">
+
+    <fragment
+        android:id="@+id/permissions_fragment"
+        android:name="de.weseng.camera.basic.fragments.PermissionsFragment"
+        android:label="Permissions" >
+
+        <action
+            android:id="@+id/action_permissions_to_selector"
+            app:destination="@id/selector_fragment"
+            app:popUpTo="@id/permissions_fragment"
+            app:popUpToInclusive="true" />
+
+    </fragment>
+
+    <fragment
+        android:id="@+id/selector_fragment"
+        android:name="de.weseng.camera.basic.fragments.SelectorFragment"
+        android:label="Selector" >
+
+        <action
+            android:id="@+id/action_selector_to_camera"
+            app:launchSingleTop="true"
+            app:destination="@id/camera_fragment" />
+
+    </fragment>
+
+    <fragment
+        android:id="@+id/camera_fragment"
+        android:name="de.weseng.camera.basic.fragments.CameraFragment"
+        android:label="Camera" >
+
+        <argument
+            android:name="camera_id"
+            app:argType="string"
+            app:nullable="false"/>
+
+        <argument
+            android:name="pixel_format"
+            app:argType="integer"
+            app:nullable="false"/>
+
+        <action
+            android:id="@+id/action_camera_to_permissions"
+            app:destination="@id/permissions_fragment"
+            app:popUpTo="@id/camera_fragment"
+            app:popUpToInclusive="true"/>
+
+        <action
+            android:id="@+id/action_camera_to_jpeg_viewer"
+            app:launchSingleTop="true"
+            app:destination="@id/image_viewer_fragment" />
+
+    </fragment>
+
+    <fragment
+        android:id="@+id/image_viewer_fragment"
+        android:name="de.weseng.camera.basic.fragments.ImageViewerFragment"
+        android:label="Image Viewer" >
+
+        <argument
+            android:name="file_path"
+            app:argType="string"
+            app:nullable="false"/>
+
+        <argument
+            android:name="orientation"
+            app:argType="integer"
+            android:defaultValue="0" />
+
+        <argument
+            android:name="depth"
+            app:argType="boolean"
+            android:defaultValue="false" />
+    </fragment>
+
+</navigation>
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+ Copyright 2015 The Android Open Source Project
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+-->
+<resources>
+    <string name="app_name">CameraLive</string>
+    <string name="capture">Capture</string>
+</resources>
--- a/app/src/main/res/values/styles.xml
+++ b/app/src/main/res/values/styles.xml
@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright 2020 The Android Open Source Project
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~     https://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+<resources>
+
+    <!-- Base application theme. -->
+    <style name="AppTheme" parent="Theme.AppCompat.DayNight.NoActionBar">
+        <item name="android:immersive">true</item>
+        <item name="android:windowFullscreen">true</item>
+        <item name="android:windowTranslucentStatus">true</item>
+        <item name="android:windowTranslucentNavigation">true</item>
+    </style>
+
+</resources>
--- a/app/src/test/java/de/weseng/camera/basic/InstrumentedTests.kt
+++ b/app/src/test/java/de/weseng/camera/basic/InstrumentedTests.kt
@@ -0,0 +1,47 @@
+/*
+ * Copyright 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package de.weseng.camera.basic
+
+import android.Manifest
+import android.content.Context
+import androidx.test.core.app.ApplicationProvider
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import androidx.test.rule.ActivityTestRule
+import androidx.test.rule.GrantPermissionRule
+import org.junit.Assert.assertEquals
+import org.junit.Rule
+import org.junit.Test
+import org.junit.runner.RunWith
+
+
+@RunWith(AndroidJUnit4::class)
+class MainInstrumentedTest {
+
+    @get:Rule
+    val permissionRule = GrantPermissionRule.grant(Manifest.permission.CAMERA)
+
+    @get:Rule
+    val activityRule: ActivityTestRule<CameraActivity> =
+            ActivityTestRule(CameraActivity::class.java)
+
+    @Test
+    fun useAppContext() {
+        // Context of the app under test
+        val context = ApplicationProvider.getApplicationContext() as Context
+        assertEquals("de.weseng.camera.basic", context.packageName)
+    }
+}
--- a/build.gradle
+++ b/build.gradle
@@ -0,0 +1,48 @@
+/*
+ * Copyright 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+
+buildscript {
+    // Top-level variables used for versioning
+    ext.kotlin_version = '1.4.31'
+    ext.java_version = JavaVersion.VERSION_1_8
+
+    repositories {
+        google()
+        jcenter()
+    }
+    dependencies {
+        classpath 'com.android.tools.build:gradle:4.1.3'
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+        classpath "androidx.navigation:navigation-safe-args-gradle-plugin:2.3.4"
+
+        // NOTE: Do not place your application dependencies here; they belong
+        // in the individual module build.gradle files
+    }
+}
+
+allprojects {
+    repositories {
+        mavenLocal()
+        google()
+        jcenter()
+    }
+}
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}
--- a/gradle.properties
+++ b/gradle.properties
@@ -0,0 +1,22 @@
+
+# Project-wide Gradle settings.
+
+# IDE (e.g. Android Studio) users:
+# Settings specified in this file will override any Gradle settings
+# configured through the IDE.
+
+# For more details on how to configure your build environment visit
+# http://www.gradle.org/docs/current/userguide/build_environment.html
+
+# Specifies the JVM arguments used for the daemon process.
+# The setting is particularly useful for tweaking memory settings.
+# Default value: -Xmx10248m -XX:MaxPermSize=256m
+# org.gradle.jvmargs=-Xmx2048m -XX:MaxPermSize=512m -XX:+HeapDumpOnOutOfMemoryError -Dfile.encoding=UTF-8
+
+# When configured, Gradle will run in incubating parallel mode.
+# This option should only be used with decoupled projects. More details, visit
+# http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
+# org.gradle.parallel=true
+
+android.enableJetifier=true
+android.useAndroidX=true
--- a/gradle/wrapper/gradle-wrapper.jar
+++ b/gradle/wrapper/gradle-wrapper.jar
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,6 @@
+#Wed Mar 31 20:44:51 PDT 2021
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-bin.zip
--- a/172
+++ b/172
@@ -0,0 +1,172 @@
+#!/usr/bin/env sh
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS=""
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=$((i+1))
+    done
+    case $i in
+        (0) set -- ;;
+        (1) set -- "$args0" ;;
+        (2) set -- "$args0" "$args1" ;;
+        (3) set -- "$args0" "$args1" "$args2" ;;
+        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=$(save "$@")
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
+if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
+  cd "$(dirname "$0")"
+fi
+
+exec "$JAVACMD" "$@"
--- a/gradlew.bat
+++ b/gradlew.bat
@@ -0,0 +1,84 @@
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS=
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
--- a/screenshots/icon-web.png
+++ b/screenshots/icon-web.png
--- a/screenshots/main.png
+++ b/screenshots/main.png
--- a/settings.gradle
+++ b/settings.gradle
@@ -0,0 +1,18 @@
+/*
+ * Copyright 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+include 'app'
+include 'utils'
--- a/utils/.gitignore
+++ b/utils/.gitignore
@@ -0,0 +1,2 @@
+/build
+.idea
--- a/utils/build.gradle
+++ b/utils/build.gradle
@@ -0,0 +1,75 @@
+/*
+ * Copyright 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+apply plugin: 'com.android.library'
+apply plugin: 'kotlin-android'
+apply plugin: 'kotlin-android-extensions'
+android {
+    compileSdkVersion 29
+
+    defaultConfig {
+        minSdkVersion 21
+        targetSdkVersion 29
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+        consumerProguardFiles 'consumer-rules.pro'
+    }
+
+    compileOptions {
+        sourceCompatibility rootProject.ext.java_version
+        targetCompatibility rootProject.ext.java_version
+    }
+
+    kotlinOptions {
+        jvmTarget = "$rootProject.ext.java_version"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+dependencies {
+
+    // Kotlin lang
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
+    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.3.4'
+
+    // App compat and UI things
+    implementation 'androidx.appcompat:appcompat:1.1.0'
+    implementation 'androidx.recyclerview:recyclerview:1.1.0'
+
+    // EXIF Interface
+    implementation 'androidx.exifinterface:exifinterface:1.2.0'
+
+    // Unit testing
+    testImplementation 'androidx.test.ext:junit:1.1.1'
+    testImplementation 'androidx.test:rules:1.2.0'
+    testImplementation 'androidx.test:runner:1.2.0'
+    testImplementation 'androidx.test.espresso:espresso-core:3.2.0'
+    testImplementation 'org.robolectric:robolectric:4.3.1'
+
+    // Instrumented testing
+    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
+    androidTestImplementation 'androidx.test:rules:1.2.0'
+    androidTestImplementation 'androidx.test:runner:1.2.0'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
+}
--- a/utils/src/main/AndroidManifest.xml
+++ b/utils/src/main/AndroidManifest.xml
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ Copyright 2020 The Android Open Source Project
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~     https://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+<manifest package="de.weseng.camera.utils" />
--- a/utils/src/main/java/de/weseng/camera/utils/AutoFitSurfaceView.kt
+++ b/utils/src/main/java/de/weseng/camera/utils/AutoFitSurfaceView.kt
@@ -0,0 +1,79 @@
+/*
+ * Copyright 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package de.weseng.camera.utils
+
+import android.content.Context
+import android.util.AttributeSet
+import android.util.Log
+import android.view.SurfaceView
+import kotlin.math.roundToInt
+
+/**
+ * A [SurfaceView] that can be adjusted to a specified aspect ratio and
+ * performs center-crop transformation of input frames.
+ */
+class AutoFitSurfaceView @JvmOverloads constructor(
+        context: Context,
+        attrs: AttributeSet? = null,
+        defStyle: Int = 0
+) : SurfaceView(context, attrs, defStyle) {
+
+    private var aspectRatio = 0f
+
+    /**
+     * Sets the aspect ratio for this view. The size of the view will be
+     * measured based on the ratio calculated from the parameters.
+     *
+     * @param width  Camera resolution horizontal size
+     * @param height Camera resolution vertical size
+     */
+    fun setAspectRatio(width: Int, height: Int) {
+        require(width > 0 && height > 0) { "Size cannot be negative" }
+        aspectRatio = width.toFloat() / height.toFloat()
+        holder.setFixedSize(width, height)
+        requestLayout()
+    }
+
+    override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
+        super.onMeasure(widthMeasureSpec, heightMeasureSpec)
+        val width = MeasureSpec.getSize(widthMeasureSpec)
+        val height = MeasureSpec.getSize(heightMeasureSpec)
+        if (aspectRatio == 0f) {
+            setMeasuredDimension(width, height)
+        } else {
+
+            // Performs center-crop transformation of the camera frames
+            val newWidth: Int
+            val newHeight: Int
+            val actualRatio = if (width > height) aspectRatio else 1f / aspectRatio
+            if (width < height * actualRatio) {
+                newHeight = height
+                newWidth = (height * actualRatio).roundToInt()
+            } else {
+                newWidth = width
+                newHeight = (width / actualRatio).roundToInt()
+            }
+
+            Log.d(TAG, "Measured dimensions set: $newWidth x $newHeight")
+            setMeasuredDimension(newWidth, newHeight)
+        }
+    }
+
+    companion object {
+        private val TAG = AutoFitSurfaceView::class.java.simpleName
+    }
+}
--- a/utils/src/main/java/de/weseng/camera/utils/CameraSizes.kt
+++ b/utils/src/main/java/de/weseng/camera/utils/CameraSizes.kt
@@ -0,0 +1,79 @@
+/*
+ * Copyright 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package de.weseng.camera.utils
+
+import android.graphics.Point
+import android.hardware.camera2.CameraCharacteristics
+import android.hardware.camera2.params.StreamConfigurationMap
+import android.util.Size
+import android.view.Display
+import kotlin.math.max
+import kotlin.math.min
+
+/** Helper class used to pre-compute shortest and longest sides of a [Size] */
+class SmartSize(width: Int, height: Int) {
+    var size = Size(width, height)
+    var long = max(size.width, size.height)
+    var short = min(size.width, size.height)
+    override fun toString() = "SmartSize(${long}x${short})"
+}
+
+/** Standard High Definition size for pictures and video */
+val SIZE_1080P: SmartSize = SmartSize(1920, 1080)
+
+/** Returns a [SmartSize] object for the given [Display] */
+fun getDisplaySmartSize(display: Display): SmartSize {
+    val outPoint = Point()
+    display.getRealSize(outPoint)
+    return SmartSize(outPoint.x, outPoint.y)
+}
+
+/**
+ * Returns the largest available PREVIEW size. For more information, see:
+ * https://d.android.com/reference/android/hardware/camera2/CameraDevice and
+ * https://developer.android.com/reference/android/hardware/camera2/params/StreamConfigurationMap
+ */
+fun <T>getPreviewOutputSize(
+        display: Display,
+        characteristics: CameraCharacteristics,
+        targetClass: Class<T>,
+        format: Int? = null
+): Size {
+
+    // Find which is smaller: screen or 1080p
+    val screenSize = getDisplaySmartSize(display)
+    val hdScreen = screenSize.long >= SIZE_1080P.long || screenSize.short >= SIZE_1080P.short
+    val maxSize = if (hdScreen) SIZE_1080P else screenSize
+
+    // If image format is provided, use it to determine supported sizes; else use target class
+    val config = characteristics.get(
+            CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP)!!
+    if (format == null)
+        assert(StreamConfigurationMap.isOutputSupportedFor(targetClass))
+    else
+        assert(config.isOutputSupportedFor(format))
+    val allSizes = if (format == null)
+        config.getOutputSizes(targetClass) else config.getOutputSizes(format)
+
+    // Get available sizes and sort them by area from largest to smallest
+    val validSizes = allSizes
+            .sortedWith(compareBy { it.height * it.width })
+            .map { SmartSize(it.width, it.height) }.reversed()
+
+    // Then, get the largest output size that is smaller or equal than our max size
+    return validSizes.first { it.long <= maxSize.long && it.short <= maxSize.short }.size
+}
--- a/utils/src/main/java/de/weseng/camera/utils/ExifUtils.kt
+++ b/utils/src/main/java/de/weseng/camera/utils/ExifUtils.kt
@@ -0,0 +1,73 @@
+/*
+ * Copyright 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package de.weseng.camera.utils
+
+import android.graphics.Bitmap
+import android.graphics.Matrix
+import android.util.Log
+import androidx.exifinterface.media.ExifInterface
+
+private const val TAG: String = "ExifUtils"
+
+/** Transforms rotation and mirroring information into one of the [ExifInterface] constants */
+fun computeExifOrientation(rotationDegrees: Int, mirrored: Boolean) = when {
+    rotationDegrees == 0 && !mirrored -> ExifInterface.ORIENTATION_NORMAL
+    rotationDegrees == 0 && mirrored -> ExifInterface.ORIENTATION_FLIP_HORIZONTAL
+    rotationDegrees == 180 && !mirrored -> ExifInterface.ORIENTATION_ROTATE_180
+    rotationDegrees == 180 && mirrored -> ExifInterface.ORIENTATION_FLIP_VERTICAL
+    rotationDegrees == 270 && mirrored -> ExifInterface.ORIENTATION_TRANSVERSE
+    rotationDegrees == 90 && !mirrored -> ExifInterface.ORIENTATION_ROTATE_90
+    rotationDegrees == 90 && mirrored -> ExifInterface.ORIENTATION_TRANSPOSE
+    rotationDegrees == 270 && mirrored -> ExifInterface.ORIENTATION_ROTATE_270
+    rotationDegrees == 270 && !mirrored -> ExifInterface.ORIENTATION_TRANSVERSE
+    else -> ExifInterface.ORIENTATION_UNDEFINED
+}
+
+/**
+ * Helper function used to convert an EXIF orientation enum into a transformation matrix
+ * that can be applied to a bitmap.
+ *
+ * @return matrix - Transformation required to properly display [Bitmap]
+ */
+fun decodeExifOrientation(exifOrientation: Int): Matrix {
+    val matrix = Matrix()
+
+    // Apply transformation corresponding to declared EXIF orientation
+    when (exifOrientation) {
+        ExifInterface.ORIENTATION_NORMAL -> Unit
+        ExifInterface.ORIENTATION_UNDEFINED -> Unit
+        ExifInterface.ORIENTATION_ROTATE_90 -> matrix.postRotate(90F)
+        ExifInterface.ORIENTATION_ROTATE_180 -> matrix.postRotate(180F)
+        ExifInterface.ORIENTATION_ROTATE_270 -> matrix.postRotate(270F)
+        ExifInterface.ORIENTATION_FLIP_HORIZONTAL -> matrix.postScale(-1F, 1F)
+        ExifInterface.ORIENTATION_FLIP_VERTICAL -> matrix.postScale(1F, -1F)
+        ExifInterface.ORIENTATION_TRANSPOSE -> {
+            matrix.postScale(-1F, 1F)
+            matrix.postRotate(270F)
+        }
+        ExifInterface.ORIENTATION_TRANSVERSE -> {
+            matrix.postScale(-1F, 1F)
+            matrix.postRotate(90F)
+        }
+
+        // Error out if the EXIF orientation is invalid
+        else -> Log.e(TAG, "Invalid orientation: $exifOrientation")
+    }
+
+    // Return the resulting matrix
+    return matrix
+}
--- a/utils/src/main/java/de/weseng/camera/utils/GenericListAdapter.kt
+++ b/utils/src/main/java/de/weseng/camera/utils/GenericListAdapter.kt
@@ -0,0 +1,55 @@
+/*
+ * Copyright 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package de.weseng.camera.utils
+
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.recyclerview.widget.RecyclerView
+
+/** Type helper used for the callback triggered once our view has been bound */
+typealias BindCallback<T> = (view: View, data: T, position: Int) -> Unit
+
+/** List adapter for generic types, intended used for small-medium lists of data */
+class GenericListAdapter<T>(
+        private val dataset: List<T>,
+        private val itemLayoutId: Int? = null,
+        private val itemViewFactory: (() -> View)? = null,
+        private val onBind: BindCallback<T>
+) : RecyclerView.Adapter<GenericListAdapter.GenericListViewHolder>() {
+
+    class GenericListViewHolder(val view: View) : RecyclerView.ViewHolder(view)
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int) = GenericListViewHolder(when {
+        itemViewFactory != null -> itemViewFactory.invoke()
+        itemLayoutId != null -> {
+            LayoutInflater.from(parent.context)
+                    .inflate(itemLayoutId, parent, false)
+        }
+        else -> {
+            throw IllegalStateException(
+                    "Either the layout ID or the view factory need to be non-null")
+        }
+    })
+
+    override fun onBindViewHolder(holder: GenericListViewHolder, position: Int) {
+        if (position < 0 || position > dataset.size) return
+        onBind(holder.view, dataset[position], position)
+    }
+
+    override fun getItemCount() = dataset.size
+}
--- a/utils/src/main/java/de/weseng/camera/utils/OrientationLiveData.kt
+++ b/utils/src/main/java/de/weseng/camera/utils/OrientationLiveData.kt
@@ -0,0 +1,95 @@
+/*
+ * Copyright 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package de.weseng.camera.utils
+
+import android.content.Context
+import android.hardware.camera2.CameraCharacteristics
+import android.view.OrientationEventListener
+import android.view.Surface
+import androidx.lifecycle.LiveData
+
+
+/**
+ * Calculates closest 90-degree orientation to compensate for the device
+ * rotation relative to sensor orientation, i.e., allows user to see camera
+ * frames with the expected orientation.
+ */
+class OrientationLiveData(
+        context: Context,
+        characteristics: CameraCharacteristics
+): LiveData<Int>() {
+
+    private val listener = object : OrientationEventListener(context.applicationContext) {
+        override fun onOrientationChanged(orientation: Int) {
+            val rotation = when {
+                orientation <= 45 -> Surface.ROTATION_0
+                orientation <= 135 -> Surface.ROTATION_90
+                orientation <= 225 -> Surface.ROTATION_180
+                orientation <= 315 -> Surface.ROTATION_270
+                else -> Surface.ROTATION_0
+            }
+            val relative = computeRelativeRotation(characteristics, rotation)
+            if (relative != value) postValue(relative)
+        }
+    }
+
+    override fun onActive() {
+        super.onActive()
+        listener.enable()
+    }
+
+    override fun onInactive() {
+        super.onInactive()
+        listener.disable()
+    }
+
+    companion object {
+
+        /**
+         * Computes rotation required to transform from the camera sensor orientation to the
+         * device's current orientation in degrees.
+         *
+         * @param characteristics the [CameraCharacteristics] to query for the sensor orientation.
+         * @param surfaceRotation the current device orientation as a Surface constant
+         * @return the relative rotation from the camera sensor to the current device orientation.
+         */
+        @JvmStatic
+        private fun computeRelativeRotation(
+                characteristics: CameraCharacteristics,
+                surfaceRotation: Int
+        ): Int {
+            val sensorOrientationDegrees =
+                    characteristics.get(CameraCharacteristics.SENSOR_ORIENTATION)!!
+
+            val deviceOrientationDegrees = when (surfaceRotation) {
+                Surface.ROTATION_0 -> 0
+                Surface.ROTATION_90 -> 90
+                Surface.ROTATION_180 -> 180
+                Surface.ROTATION_270 -> 270
+                else -> 0
+            }
+
+            // Reverse device orientation for front-facing cameras
+            val sign = if (characteristics.get(CameraCharacteristics.LENS_FACING) ==
+                    CameraCharacteristics.LENS_FACING_FRONT) 1 else -1
+
+            // Calculate desired JPEG orientation relative to camera orientation to make
+            // the image upright relative to the device orientation
+            return (sensorOrientationDegrees - (deviceOrientationDegrees * sign) + 360) % 360
+        }
+    }
+}
--- a/utils/src/main/java/de/weseng/camera/utils/YuvToRgbConverter.kt
+++ b/utils/src/main/java/de/weseng/camera/utils/YuvToRgbConverter.kt
@@ -0,0 +1,198 @@
+/*
+ * Copyright 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package de.weseng.camera.utils
+
+import android.content.Context
+import android.graphics.Bitmap
+import android.graphics.ImageFormat
+import android.graphics.Rect
+import android.media.Image
+import android.renderscript.Allocation
+import android.renderscript.Element
+import android.renderscript.RenderScript
+import android.renderscript.ScriptIntrinsicYuvToRGB
+import android.renderscript.Type
+
+/**
+ * Helper class used to efficiently convert a [Media.Image] object from
+ * [ImageFormat.YUV_420_888] format to an RGB [Bitmap] object.
+ *
+ * The [yuvToRgb] method is able to achieve the same FPS as the CameraX image
+ * analysis use case on a Pixel 3 XL device at the default analyzer resolution,
+ * which is 30 FPS with 640x480.
+ *
+ * NOTE: This has been tested in a limited number of devices and is not
+ * considered production-ready code. It was created for illustration purposes,
+ * since this is not an efficient camera pipeline due to the multiple copies
+ * required to convert each frame.
+ */
+class YuvToRgbConverter(context: Context) {
+    private val rs = RenderScript.create(context)
+    private val scriptYuvToRgb = ScriptIntrinsicYuvToRGB.create(rs, Element.U8_4(rs))
+
+    private var pixelCount: Int = -1
+    private lateinit var yuvBuffer: ByteArray
+    private lateinit var inputAllocation: Allocation
+    private lateinit var outputAllocation: Allocation
+
+    @Synchronized
+    fun yuvToRgb(image: Image, output: Bitmap) {
+
+        // Ensure that the intermediate output byte buffer is allocated
+        if (!::yuvBuffer.isInitialized) {
+            pixelCount = image.cropRect.width() * image.cropRect.height()
+            // Bits per pixel is an average for the whole image, so it's useful to compute the size
+            // of the full buffer but should not be used to determine pixel offsets
+            val pixelSizeBits = ImageFormat.getBitsPerPixel(ImageFormat.YUV_420_888)
+            yuvBuffer = ByteArray(pixelCount * pixelSizeBits / 8)
+        }
+
+        // Get the YUV data in byte array form using NV21 format
+        imageToByteArray(image, yuvBuffer)
+
+        // Ensure that the RenderScript inputs and outputs are allocated
+        if (!::inputAllocation.isInitialized) {
+            // Explicitly create an element with type NV21, since that's the pixel format we use
+            val elemType = Type.Builder(rs, Element.YUV(rs)).setYuvFormat(ImageFormat.NV21).create()
+            inputAllocation = Allocation.createSized(rs, elemType.element, yuvBuffer.size)
+        }
+        if (!::outputAllocation.isInitialized) {
+            outputAllocation = Allocation.createFromBitmap(rs, output)
+        }
+
+        // Convert NV21 format YUV to RGB
+        inputAllocation.copyFrom(yuvBuffer)
+        scriptYuvToRgb.setInput(inputAllocation)
+        scriptYuvToRgb.forEach(outputAllocation)
+        outputAllocation.copyTo(output)
+    }
+
+    private fun imageToByteArray(image: Image, outputBuffer: ByteArray) {
+        assert(image.format == ImageFormat.YUV_420_888)
+
+        val imageCrop = image.cropRect
+        val imagePlanes = image.planes
+
+        imagePlanes.forEachIndexed { planeIndex, plane ->
+            // How many values are read in input for each output value written
+            // Only the Y plane has a value for every pixel, U and V have half the resolution i.e.
+            //
+            // Y Plane            U Plane    V Plane
+            // ===============    =======    =======
+            // Y Y Y Y Y Y Y Y    U U U U    V V V V
+            // Y Y Y Y Y Y Y Y    U U U U    V V V V
+            // Y Y Y Y Y Y Y Y    U U U U    V V V V
+            // Y Y Y Y Y Y Y Y    U U U U    V V V V
+            // Y Y Y Y Y Y Y Y
+            // Y Y Y Y Y Y Y Y
+            // Y Y Y Y Y Y Y Y
+            val outputStride: Int
+
+            // The index in the output buffer the next value will be written at
+            // For Y it's zero, for U and V we start at the end of Y and interleave them i.e.
+            //
+            // First chunk        Second chunk
+            // ===============    ===============
+            // Y Y Y Y Y Y Y Y    V U V U V U V U
+            // Y Y Y Y Y Y Y Y    V U V U V U V U
+            // Y Y Y Y Y Y Y Y    V U V U V U V U
+            // Y Y Y Y Y Y Y Y    V U V U V U V U
+            // Y Y Y Y Y Y Y Y
+            // Y Y Y Y Y Y Y Y
+            // Y Y Y Y Y Y Y Y
+            var outputOffset: Int
+
+            when (planeIndex) {
+                0 -> {
+                    outputStride = 1
+                    outputOffset = 0
+                }
+                1 -> {
+                    outputStride = 2
+                    // For NV21 format, U is in odd-numbered indices
+                    outputOffset = pixelCount + 1
+                }
+                2 -> {
+                    outputStride = 2
+                    // For NV21 format, V is in even-numbered indices
+                    outputOffset = pixelCount
+                }
+                else -> {
+                    // Image contains more than 3 planes, something strange is going on
+                    return@forEachIndexed
+                }
+            }
+
+            val planeBuffer = plane.buffer
+            val rowStride = plane.rowStride
+            val pixelStride = plane.pixelStride
+
+            // We have to divide the width and height by two if it's not the Y plane
+            val planeCrop = if (planeIndex == 0) {
+                imageCrop
+            } else {
+                Rect(
+                    imageCrop.left / 2,
+                    imageCrop.top / 2,
+                    imageCrop.right / 2,
+                    imageCrop.bottom / 2
+                )
+            }
+
+            val planeWidth = planeCrop.width()
+            val planeHeight = planeCrop.height()
+
+            // Intermediate buffer used to store the bytes of each row
+            val rowBuffer = ByteArray(plane.rowStride)
+
+            // Size of each row in bytes
+            val rowLength = if (pixelStride == 1 && outputStride == 1) {
+                planeWidth
+            } else {
+                // Take into account that the stride may include data from pixels other than this
+                // particular plane and row, and that could be between pixels and not after every
+                // pixel:
+                //
+                // |---- Pixel stride ----|                    Row ends here --> |
+                // | Pixel 1 | Other Data | Pixel 2 | Other Data | ... | Pixel N |
+                //
+                // We need to get (N-1) * (pixel stride bytes) per row + 1 byte for the last pixel
+                (planeWidth - 1) * pixelStride + 1
+            }
+
+            for (row in 0 until planeHeight) {
+                // Move buffer position to the beginning of this row
+                planeBuffer.position(
+                    (row + planeCrop.top) * rowStride + planeCrop.left * pixelStride)
+
+                if (pixelStride == 1 && outputStride == 1) {
+                    // When there is a single stride value for pixel and output, we can just copy
+                    // the entire row in a single step
+                    planeBuffer.get(outputBuffer, outputOffset, rowLength)
+                    outputOffset += rowLength
+                } else {
+                    // When either pixel or output have a stride > 1 we must copy pixel by pixel
+                    planeBuffer.get(rowBuffer, 0, rowLength)
+                    for (col in 0 until planeWidth) {
+                        outputBuffer[outputOffset] = rowBuffer[col * pixelStride]
+                        outputOffset += outputStride
+                    }
+                }
+            }
+        }
+    }
+}
--- a/utils/src/main/res/drawable/ic_shutter.xml
+++ b/utils/src/main/res/drawable/ic_shutter.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright 2020 The Android Open Source Project
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~     https://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:state_pressed="true" android:drawable="@drawable/ic_shutter_pressed" />
+    <item android:state_focused="true" android:drawable="@drawable/ic_shutter_focused" />
+    <item android:drawable="@drawable/ic_shutter_normal" />
+</selector>
--- a/utils/src/main/res/drawable/ic_shutter_focused.xml
+++ b/utils/src/main/res/drawable/ic_shutter_focused.xml
@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright 2020 The Android Open Source Project
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~     https://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="74"
+    android:viewportHeight="74">
+    <path android:fillColor="#FFFFFF" android:fillType="evenOdd"
+        android:pathData="M73.1,37C73.1,17.0637 56.9373,0.9 37,0.9C17.0627,0.9 0.9,17.0637 0.9,37C0.9,56.9373 17.0627,73.1 37,73.1C56.9373,73.1 73.1,56.9373 73.1,37"
+        android:strokeColor="#00000000" android:strokeWidth="1"/>
+    <path android:fillColor="#58A0C4" android:fillType="evenOdd"
+        android:pathData="M67.4,37C67.4,53.7895 53.7895,67.4 37,67.4C20.2105,67.4 6.6,53.7895 6.6,37C6.6,20.2105 20.2105,6.6 37,6.6C53.7895,6.6 67.4,20.2105 67.4,37"
+        android:strokeColor="#00000000" android:strokeWidth="1"/>
+</vector>
--- a/utils/src/main/res/drawable/ic_shutter_normal.xml
+++ b/utils/src/main/res/drawable/ic_shutter_normal.xml
@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright 2020 The Android Open Source Project
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~     https://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="74"
+    android:viewportHeight="74">
+    <path android:fillColor="#FFFFFF" android:fillType="evenOdd"
+        android:pathData="M73.1,37C73.1,17.0637 56.9373,0.9 37,0.9C17.0627,0.9 0.9,17.0637 0.9,37C0.9,56.9373 17.0627,73.1 37,73.1C56.9373,73.1 73.1,56.9373 73.1,37"
+        android:strokeColor="#00000000" android:strokeWidth="1"/>
+    <path android:fillColor="#CFD7DB" android:fillType="evenOdd"
+        android:pathData="M67.4,37C67.4,53.7895 53.7895,67.4 37,67.4C20.2105,67.4 6.6,53.7895 6.6,37C6.6,20.2105 20.2105,6.6 37,6.6C53.7895,6.6 67.4,20.2105 67.4,37"
+        android:strokeColor="#00000000" android:strokeWidth="1"/>
+</vector>
--- a/utils/src/main/res/drawable/ic_shutter_pressed.xml
+++ b/utils/src/main/res/drawable/ic_shutter_pressed.xml
@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright 2020 The Android Open Source Project
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~     https://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="74"
+    android:viewportHeight="74">
+    <path android:fillColor="#FFFFFF" android:fillType="evenOdd"
+        android:pathData="M73.1,37C73.1,17.0637 56.9373,0.9 37,0.9C17.0627,0.9 0.9,17.0637 0.9,37C0.9,56.9373 17.0627,73.1 37,73.1C56.9373,73.1 73.1,56.9373 73.1,37"
+        android:strokeColor="#00000000" android:strokeWidth="1"/>
+    <path android:fillColor="#58A0C4" android:fillType="evenOdd"
+        android:pathData="M67.4,37C67.4,53.7895 53.7895,67.4 37,67.4C20.2105,67.4 6.6,53.7895 6.6,37C6.6,20.2105 20.2105,6.6 37,6.6C53.7895,6.6 67.4,20.2105 67.4,37"
+        android:strokeColor="#00000000" android:strokeWidth="1"/>
+</vector>