Fixing for Android 12

packages/audiofileplayer/android/build.gradle

@@ -22,7 +22,7 @@ rootProject.allprojects {
 apply plugin: 'com.android.library'
 
 android {
-    compileSdkVersion 29
+    compileSdkVersion 31
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
@@ -40,5 +40,5 @@ android {
 
 dependencies {
     implementation 'androidx.core:core:1.0.0'
-    implementation 'androidx.media:media:1.0.0'
+    implementation 'androidx.media:media:1.3.0'
 }

packages/audiofileplayer/android/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.8-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

packages/audiofileplayer/android/src/main/java/com/google/flutter/plugins/audiofileplayer/AudiofileplayerPlugin.java

@@ -509,16 +509,12 @@ public void onActivityDestroyed(Activity activity) {
         @Override
         public void onConnected() {
           Log.i(TAG, "ConnectionCallback.onConnected");
-          try {
-            MediaSessionCompat.Token token = mediaBrowser.getSessionToken();
-            mediaController = new MediaControllerCompat(activity, token);
-            MediaControllerCompat.setMediaController(activity, mediaController);
-            mediaController.registerCallback(controllerCallback);
-            AudiofileplayerService.instance.setPendingIntentActivity(activity);
-            AudiofileplayerService.instance.setListener(AudiofileplayerPlugin.this);
-          } catch (RemoteException e) {
-            throw new RuntimeException(e);
-          }
+          MediaSessionCompat.Token token = mediaBrowser.getSessionToken();
+          mediaController = new MediaControllerCompat(activity, token);
+          MediaControllerCompat.setMediaController(activity, mediaController);
+          mediaController.registerCallback(controllerCallback);
+          AudiofileplayerService.instance.setPendingIntentActivity(activity);
+          AudiofileplayerService.instance.setListener(AudiofileplayerPlugin.this);
         }
 
         @Override
@@ -676,8 +672,9 @@ private NotificationCompat.Action customMediaButtonMapToAction(Map customMediaBu
     Intent intent = new Intent(Intent.ACTION_MEDIA_BUTTON);
     intent.setComponent(component);
     intent.putExtra(CUSTOM_MEDIA_BUTTON_EXTRA_KEY, eventId);
+
     PendingIntent pendingIntent =
-        PendingIntent.getService(context, 0, intent, PendingIntent.FLAG_CANCEL_CURRENT);
+        PendingIntent.getService(context, 0, intent, PendingIntent.FLAG_IMMUTABLE | PendingIntent.FLAG_CANCEL_CURRENT);
 
     return new NotificationCompat.Action(resourceId, title, pendingIntent);
   }

packages/audiofileplayer/android/src/main/java/com/google/flutter/plugins/audiofileplayer/AudiofileplayerService.java

@@ -62,8 +62,13 @@ public void onCreate() {
     super.onCreate();
     Log.i(TAG, "onCreate");
     instance = this;
+    PendingIntent pendingItent = PendingIntent.getBroadcast(
+            getApplicationContext(),
+            0, new Intent(Intent.ACTION_MEDIA_BUTTON),
+            PendingIntent.FLAG_IMMUTABLE
+    );
 
-    mediaSession = new MediaSessionCompat(this, TAG);
+    mediaSession = new MediaSessionCompat(this, TAG, null, pendingItent);
     mediaSession.setFlags(
         MediaSessionCompat.FLAG_HANDLES_MEDIA_BUTTONS
             | MediaSessionCompat.FLAG_HANDLES_TRANSPORT_CONTROLS);
@@ -137,7 +142,7 @@ public void setPendingIntentActivity(Activity activity) {
     Context context = activity.getApplicationContext();
     Intent intent = new Intent(context, activity.getClass());
     PendingIntent pendingIntent =
-        PendingIntent.getActivity(context, 99, intent, PendingIntent.FLAG_UPDATE_CURRENT);
+            PendingIntent.getActivity(context, 99, intent, PendingIntent.FLAG_IMMUTABLE | PendingIntent.FLAG_UPDATE_CURRENT);
     mediaSession.setSessionActivity(pendingIntent);
   }