overwrite web style, change min sdk to 16 and add German hints

app/build.gradle

@@ -4,7 +4,7 @@ android {
     compileSdkVersion 28
     defaultConfig {
         applicationId "de.weseng.wifiweatherstation"
-        minSdkVersion 15
+        minSdkVersion 16
         targetSdkVersion 28
         versionCode 20190302
         versionName "2019.3.2"

app/src/main/AndroidManifest.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
     package="de.weseng.wifiweatherstation">
 
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
@@ -14,7 +15,8 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/DarkTheme"
-        android:usesCleartextTraffic="true">
+        android:usesCleartextTraffic="true"
+        tools:ignore="AllowBackup,GoogleAppIndexingWarning">
         <activity android:name=".MainActivity">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />

app/src/main/assets/style.css

@@ -0,0 +1,3 @@
+body {
+  background-color: transparent;
+}

app/src/main/java/de/weseng/wifiweatherstation/MainActivity.java

@@ -1,5 +1,6 @@
 package de.weseng.wifiweatherstation;
 
+import android.annotation.SuppressLint;
 import android.app.ProgressDialog;
 import android.content.Context;
 import android.content.Intent;
@@ -14,6 +15,7 @@ import android.net.wifi.WifiInfo;
 import android.net.wifi.WifiManager;
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
+import android.util.Base64;
 import android.view.KeyEvent;
 import android.view.Menu;
 import android.view.MenuItem;
@@ -22,6 +24,7 @@ import android.webkit.WebView;
 import android.webkit.WebViewClient;
 import android.widget.Toast;
 
+import java.io.InputStream;
 import java.util.List;
 
 
@@ -30,6 +33,7 @@ public class MainActivity extends AppCompatActivity {
     WebView myWebView;
     public static String MESSAGE = "de.weseng.wifiweatherstation.MESSAGE";
 
+    @SuppressLint("SetJavaScriptEnabled")
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -71,8 +75,11 @@ public class MainActivity extends AppCompatActivity {
 
             @Override
             public void onPageFinished(WebView view, String url) {
+                // Inject CSS when page is done loading
+                injectCSS();
+
                 pd.dismiss();
-                String webUrl = myWebView.getUrl();
+                //String webUrl = myWebView.getUrl();
             }
 
             @Override
@@ -174,6 +181,30 @@ public class MainActivity extends AppCompatActivity {
         myWebView.restoreState(savedInstanceState);
     }
 
+
+    // Inject CSS method: read style.css from assets folder
+    // Append stylesheet to document head
+    private void injectCSS() {
+        try {
+            InputStream inputStream = getAssets().open("style.css");
+            byte[] buffer = new byte[inputStream.available()];
+            //noinspection ResultOfMethodCallIgnored
+            inputStream.read(buffer);  // read is necessary!
+            inputStream.close();
+            String encoded = Base64.encodeToString(buffer, Base64.NO_WRAP);
+            myWebView.loadUrl("javascript:(function() {" +
+                    "var parent = document.getElementsByTagName('head').item(0);" +
+                    "var style = document.createElement('style');" +
+                    "style.type = 'text/css';" +
+                    // Tell the browser to BASE64-decode the string into your script !!!
+                    "style.innerHTML = window.atob('" + encoded + "');" +
+                    "parent.appendChild(style)" +
+                    "})()");
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
     /** Called when the user taps the Send button */
     public void settings() {
         Intent intentSettings = new Intent(this, SettingsActivity.class);

app/src/main/java/de/weseng/wifiweatherstation/SettingsActivity.java

@@ -1,21 +1,13 @@
 package de.weseng.wifiweatherstation;
 
-import android.content.Context;
 import android.content.Intent;
 import android.content.SharedPreferences;
-import android.net.ConnectivityManager;
-import android.net.NetworkInfo;
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
 import android.view.KeyEvent;
-import android.view.MenuItem;
 import android.view.View;
-import android.view.inputmethod.EditorInfo;
 import android.widget.EditText;
 import android.widget.TextView;
-import android.widget.Toast;
-
-import static de.weseng.wifiweatherstation.MainActivity.PREFS_NAME;
 
 public class SettingsActivity extends AppCompatActivity {
     public static final String PREFS_NAME = "Settings";
@@ -99,7 +91,6 @@ public class SettingsActivity extends AppCompatActivity {
         // platform.
         save_all();
         super.onBackPressed();
-        return;
     }
 
     @Override
@@ -122,6 +113,6 @@ public class SettingsActivity extends AppCompatActivity {
         editor.putString(key, value);
 
         // Commit the edits!
-        editor.commit();
+        editor.apply();
     }
 }

app/src/main/res/layout/activity_settings.xml

@@ -11,7 +11,7 @@
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_marginTop="16dp"
-        android:text="TextView"
+        android:text=""
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent" />
@@ -30,7 +30,7 @@
             android:id="@+id/editTextSsidLocal"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
-            android:hint="SSID"
+            android:hint="@string/hint_ssid"
             android:inputType="text" />
     </android.support.design.widget.TextInputLayout>
 
@@ -48,7 +48,7 @@
             android:id="@+id/editTextUrlLocal"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
-            android:hint="Local URL"
+            android:hint="@string/hint_url_local"
             android:inputType="text" />
     </android.support.design.widget.TextInputLayout>
 
@@ -66,10 +66,8 @@
             android:id="@+id/editTextUrlGlobal"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
-            android:hint="Global URL"
+            android:hint="@string/hint_url_global"
             android:inputType="text" />
     </android.support.design.widget.TextInputLayout>
 
-
-
 </android.support.constraint.ConstraintLayout>

app/src/main/res/menu/main.xml

@@ -2,6 +2,6 @@
 <menu xmlns:android="http://schemas.android.com/apk/res/android">
     <item android:id="@+id/settings"
           android:title="@string/settings"/>
-          //android:icon="@drawable/ic_new_game"
+          <!--android:icon="@drawable/ic_new_game"-->
-          //android:showAsAction="ifRoom"
+          <!--android:showAsAction="ifRoom"-->
 </menu>

app/src/main/res/values-de/strings.xml

@@ -1,5 +1,7 @@
 <resources>
     <string name="app_name">WiFi-Wetter-Station</string>
     <string name="settings">Einstellungen</string>
-    <string name="loading">Bitte warten, die Ansicht wird geladen...</string>
+    <string name="loading">Bitte warten, die Ansicht wird geladen…</string>
+    <string name="hint_url_local">Lokale URL</string>
+    <string name="hint_url_global">Globale URL</string>
 </resources>

app/src/main/res/values/strings.xml

@@ -1,8 +1,11 @@
 <resources>
     <string name="app_name">WiFi Weather Station</string>
     <string name="settings">Settings</string>
-    <string name="loading">Please wait, the view is loading...</string>
+    <string name="loading">Please wait, the view is loading…</string>
     <string name="ssid" translatable="false">NETGEAR26-5G-2</string>
     <string name="url_local" translatable="false">http://192.168.1.5/site/wifi-weather-station/</string>
     <string name="url_global" translatable="false">http://inetsrv.no-ip.org/site/wifi-weather-station/</string>
+    <string name="hint_ssid" translatable="false">SSID</string>
+    <string name="hint_url_local">Local URL</string>
+    <string name="hint_url_global">Global URL</string>
 </resources>