inital commit

2021-04-18 19:37:00 +02:00
commit 51b2c91d24
44 changed files with 2782 additions and 0 deletions
--- 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)
+    }
+}