Screen Saver Android implementation (experiment)

android/app/build.gradle.kts

@@ -19,13 +19,13 @@ android {
     namespace = "com.pranshulgg.weather_master_app"
     compileSdk = flutter.compileSdkVersion
     ndkVersion = "27.0.12077973"
-    
+
 
     compileOptions {
         sourceCompatibility = JavaVersion.VERSION_17
         targetCompatibility = JavaVersion.VERSION_17
         isCoreLibraryDesugaringEnabled = true
-        
+
     }
 
     kotlinOptions {
@@ -37,7 +37,7 @@ android {
         applicationId = "com.pranshulgg.weather_master_app"
         // You can update the following values to match your application needs.
         // For more information, see: https://flutter.dev/to/review-gradle-config.
-        minSdk = 23
+        minSdk = flutter.minSdkVersion
         targetSdk = flutter.targetSdkVersion
         versionCode = flutter.versionCode
         versionName = flutter.versionName

android/app/src/main/AndroidManifest.xml

@@ -5,9 +5,9 @@
     <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
-    <uses-permission android:name="android.permission.FOREGROUND_SERVICE"/>
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
     <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
-    <uses-permission android:name="android.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS"/>
+    <uses-permission android:name="android.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS" />
     <uses-permission android:name="android.permission.WAKE_LOCK" />
     <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE_DATA_SYNC" />
@@ -31,12 +31,11 @@
                  while the Flutter UI initializes. After that, this theme continues
                  to determine the Window background behind the Flutter UI. -->
             <meta-data
-              android:name="io.flutter.embedding.android.NormalTheme"
-              android:resource="@style/NormalTheme"
-              />
+                android:name="io.flutter.embedding.android.NormalTheme"
+                android:resource="@style/NormalTheme" />
             <intent-filter>
-                <action android:name="android.intent.action.MAIN"/>
-                <category android:name="android.intent.category.LAUNCHER"/>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
         <!-- Don't delete the meta-data below.
@@ -47,17 +46,19 @@
 
         <!-- WIDGETS -->
 
-    <receiver
-        android:name="dev.fluttercommunity.plus.homewidget.HomeWidgetBackgroundReceiver"
-        android:exported="true"
-        >
-        <intent-filter>
-            <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
-        </intent-filter>
-    </receiver>
+        <receiver
+            android:name="dev.fluttercommunity.plus.homewidget.HomeWidgetBackgroundReceiver"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
+            </intent-filter>
+        </receiver>
 
 
-        <receiver android:name=".WeatherWidgetProvider" android:exported="true" android:label="Current horizontal pill">
+        <receiver
+            android:name=".WeatherWidgetProvider"
+            android:exported="true"
+            android:label="Current horizontal pill">
             <intent-filter>
                 <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
             </intent-filter>
@@ -67,7 +68,10 @@
                 android:resource="@xml/weather_widget_info" />
         </receiver>
 
-        <receiver android:name=".WeatherWidgetCastProvider" android:exported="true" android:label="Current + hourly + daily">
+        <receiver
+            android:name=".WeatherWidgetCastProvider"
+            android:exported="true"
+            android:label="Current + hourly + daily">
             <intent-filter>
                 <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
             </intent-filter>
@@ -77,7 +81,10 @@
                 android:resource="@xml/weather_widget_info_cast" />
         </receiver>
 
-        <receiver android:name=".PillWidgetProvider" android:exported="true" android:label="Current pill">
+        <receiver
+            android:name=".PillWidgetProvider"
+            android:exported="true"
+            android:label="Current pill">
             <intent-filter>
                 <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
             </intent-filter>
@@ -87,7 +94,10 @@
                 android:resource="@xml/pill_widget_info" />
         </receiver>
 
-        <receiver android:name=".ClockHourlyWidgetProvider" android:exported="true" android:label="Clock + hourly + current">
+        <receiver
+            android:name=".ClockHourlyWidgetProvider"
+            android:exported="true"
+            android:label="Clock + hourly + current">
             <intent-filter>
                 <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
             </intent-filter>
@@ -97,7 +107,10 @@
                 android:resource="@xml/clock_hourly_info" />
         </receiver>
 
-        <receiver android:name=".DateCurrentWidgetProvider" android:exported="true" android:label="Date + Current">
+        <receiver
+            android:name=".DateCurrentWidgetProvider"
+            android:exported="true"
+            android:label="Date + Current">
             <intent-filter>
                 <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
             </intent-filter>
@@ -107,11 +120,14 @@
                 android:resource="@xml/date_temp_widget_info" />
         </receiver>
 
-        <activity android:name=".clockDateWidgetConfigActivity"
+        <activity
+            android:name=".clockDateWidgetConfigActivity"
             android:theme="@style/Theme.widgetsThemeConfigs"
-            android:exported="true">
-        </activity>
-        <receiver android:name=".clockDateWidgetProvider" android:exported="true" android:label="Glance">
+            android:exported="true"></activity>
+        <receiver
+            android:name=".clockDateWidgetProvider"
+            android:exported="true"
+            android:label="Glance">
             <intent-filter>
                 <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
             </intent-filter>
@@ -130,8 +146,24 @@
 
         <!-- WIDGETS END -->
 
+        <!-- SCREEN SAVERS -->
+        <service
+            android:name=".WeatherDreamService"
+            android:exported="true"
+            android:icon="@drawable/shape_set_2"
+            android:label="Weather"
+            android:permission="android.permission.BIND_DREAM_SERVICE">
 
+            <intent-filter>
+                <action android:name="android.service.dreams.DreamService" />
+                <category android:name="android.intent.category.DEFAULT" />
+            </intent-filter>
 
+            <meta-data
+                android:name="android.service.dream"
+                android:resource="@xml/weather_dream" />
+        </service>
+        <!-- SCREEN SAVERS END -->
     </application>
     <!-- Required to query activities that can process text, see:
          https://developer.android.com/training/package-visibility and
@@ -140,8 +172,8 @@
          In particular, this is used by the Flutter engine in io.flutter.plugin.text.ProcessTextPlugin. -->
     <queries>
         <intent>
-            <action android:name="android.intent.action.PROCESS_TEXT"/>
-            <data android:mimeType="text/plain"/>
+            <action android:name="android.intent.action.PROCESS_TEXT" />
+            <data android:mimeType="text/plain" />
         </intent>
     </queries>
 </manifest>

android/app/src/main/kotlin/com/pranshulgg/weather_master_app/WeatherDreamService.kt

@@ -0,0 +1,101 @@
+package com.pranshulgg.weather_master_app
+
+import android.service.dreams.DreamService
+import android.view.ViewGroup
+import io.flutter.FlutterInjector
+import io.flutter.embedding.android.FlutterActivity
+import io.flutter.embedding.android.FlutterView
+import io.flutter.embedding.engine.FlutterEngine
+import io.flutter.embedding.engine.dart.DartExecutor.DartEntrypoint
+import io.flutter.plugins.GeneratedPluginRegistrant
+
+
+class WeatherDreamService : DreamService() {
+    private var flutterEngine: FlutterEngine? = null
+    private var flutterView: FlutterView? = null
+
+    override fun onAttachedToWindow() {
+        super.onAttachedToWindow()
+
+        // Allow click to propagate to the FlutterView
+        isInteractive = true
+
+        // Make the window fullscreen
+        isFullscreen = true
+
+        // TODO: figure out if this is required or not
+        isScreenBright = true
+
+        // It doesn't seem work with applicationContext, use this instead:
+        val engine = flutterEngine ?: FlutterEngine(this, null).also {
+            it.dartExecutor.executeDartEntrypoint(
+                DartEntrypoint(
+                    dartEntrypointFunctionName = "onDreamServiceStarted"
+                )
+            )
+            flutterEngine = it
+        }
+
+
+        //setContentView(R.layout.flutter_view)
+        //flutterView = findViewById<FlutterView>(R.id.flutter_view).also {
+        //    it.attachToFlutterEngine(engine)
+        //}
+
+        flutterView = FlutterView(this).also {
+            it.id = FlutterActivity.FLUTTER_VIEW_ID
+            it.layoutParams = ViewGroup.LayoutParams(
+                ViewGroup.LayoutParams.MATCH_PARENT,
+                ViewGroup.LayoutParams.MATCH_PARENT
+            )
+            it.isFocusable = true
+            it.isFocusableInTouchMode = true
+
+            setContentView(it)
+
+            it.attachToFlutterEngine(engine)
+            it.requestFocus()
+        }
+    }
+
+    override fun onDreamingStarted() {
+        super.onDreamingStarted()
+        flutterEngine?.lifecycleChannel?.appIsResumed()
+    }
+
+    override fun onDreamingStopped() {
+        super.onDreamingStopped()
+        flutterEngine?.lifecycleChannel?.appIsInactive()
+        flutterEngine?.lifecycleChannel?.appIsPaused()
+    }
+
+    override fun onDetachedFromWindow() {
+        flutterView?.let {
+            it.detachFromFlutterEngine()
+            flutterView = null
+        }
+        super.onDetachedFromWindow()
+    }
+}
+
+fun DartEntrypoint(
+    pathToBundle: String? = null,
+    dartEntrypointLibrary: String? = null,
+    dartEntrypointFunctionName: String = "main"
+): DartEntrypoint {
+    val pathToBundle = pathToBundle ?: FlutterInjector.instance().flutterLoader().let {
+        if (!it.initialized()) {
+            throw AssertionError(
+                "DartEntrypoints can only be created once a FlutterEngine is created."
+            )
+        }
+        it.findAppBundlePath()
+    }
+    return dartEntrypointLibrary?.let {
+        DartEntrypoint(
+            pathToBundle,
+            it,
+            dartEntrypointFunctionName
+        )
+    } ?: DartEntrypoint(pathToBundle, dartEntrypointFunctionName)
+}

android/app/src/main/res/layout/flutter_view.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<io.flutter.embedding.android.FlutterView xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:id="@+id/flutter_view"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent" />

android/app/src/main/res/xml/weather_dream.xml

@@ -0,0 +1,4 @@
+<dream xmlns:android="http://schemas.android.com/apk/res/android"
+    android:previewImage="@mipmap/ic_launcher"
+    android:showClockAndComplications="false"
+    android:settingsActivity="com.pranshulgg.weather_master_app.MainActivity" />

lib/main.dart

@@ -172,6 +172,38 @@ void main() async {
   );
 }
 
+@pragma('vm:entry-point')
+void onDreamServiceStarted() {
+  WidgetsFlutterBinding.ensureInitialized();
+  runApp(MaterialApp(
+    theme: ThemeData.light(),
+    darkTheme: ThemeData.dark(),
+    home: Builder(builder: (context) {
+      return Scaffold(
+        body: Center(
+          child: FilledButton(
+              onPressed: () => showDialog(
+                    context: context,
+                    builder: (context) => AlertDialog(
+                      title: Text("Headline"),
+                      content: Text("Supporting text"),
+                      actions: [
+                        TextButton(
+                            onPressed: () => Navigator.pop(context),
+                            child: Text("Cancel")),
+                        TextButton(
+                            onPressed: () => Navigator.pop(context),
+                            child: Text("OK"))
+                      ],
+                    ),
+                  ),
+              child: Text("Hello world!")),
+        ),
+      );
+    }),
+  ));
+}
+
 class MyApp extends StatelessWidget {
   final String? cacheKey;
   final String? cityName;