PendingIntent Flag missing in Android > 31

[gabdy]

In Android 31 i'm getting an error, that the PendingIntent needs a flag.
I tried to fix it by adding "PendingIntent.FLAG_IMMUTABLE", but i had no luck.
Is there a solution for this problem?

This is the error log:

Launching lib/main.dart on sdk gphone64 arm64 in debug mode...
✓  Built build/app/outputs/flutter-apk/app-debug.apk.
Connecting to VM Service at ws://127.0.0.1:58465/2GRamNiEcaY=/ws
I/javaClass(10003): Calling to method: initService
I/javaClass(10003): start service invoked
I/javaClass(10003): Attempting to initialize service...
I/javaClass(10003): Service not bound, binding now....
I/javaClass(10003): Mapping method call to player item object
I/javaClass(10003): Firing up service. (onStartCommand)...
I/javaClass(10003): LocalBroadCastManager Received...
W/t.studiopiu.vm(10003): Accessing hidden method Landroid/media/AudioTrack;->getLatency()I (unsupported, reflection, allowed)
I/ExoPlayerImpl(10003): Init 66048fd [ExoPlayerLib/2.13.1] [emulator64_arm64, sdk_gphone64_arm64, Google, 31]
I/javaClass(10003): Pushing Event: flutter_radio_stopped
I/javaClass(10003): onPlayerStateChanged: STOPPED
I/javaClass(10003): Pushing Event: flutter_radio_loading
I/javaClass(10003): onPlayerStateChanged: LOADING
D/CompatibilityChangeReporter(10003): Compat change id reported: 160794467; UID 10146; state: ENABLED
D/AndroidRuntime(10003): Shutting down VM
E/AndroidRuntime(10003): FATAL EXCEPTION: main
E/AndroidRuntime(10003): Process: com.example.app, PID: 10003
E/AndroidRuntime(10003): java.lang.RuntimeException: Unable to start service me.sithiramunasinghe.flutter.flutter_radio_player.core.StreamingCore@d40233e with Intent { cmp=com.example.app/me.sithiramunasinghe.flutter.flutter_radio_player.core.StreamingCore (has extras) }: java.lang.IllegalArgumentException: com.example.app: Targeting S+ (version 31 and above) requires that one of FLAG_IMMUTABLE or FLAG_MUTABLE be specified when creating a PendingIntent.
E/AndroidRuntime(10003): Strongly consider using FLAG_IMMUTABLE, only use FLAG_MUTABLE if some functionality depends on the PendingIntent being mutable, e.g. if it needs to be used with inline replies or bubbles.
E/AndroidRuntime(10003): 	at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:4661)
E/AndroidRuntime(10003): 	at android.app.ActivityThread.access$2000(ActivityThread.java:247)
E/AndroidRuntime(10003): 	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2095)
E/AndroidRuntime(10003): 	at android.os.Handler.dispatchMessage(Handler.java:106)
E/AndroidRuntime(10003): 	at android.os.Looper.loopOnce(Looper.java:201)
E/AndroidRuntime(10003): 	at android.os.Looper.loop(Looper.java:288)
E/AndroidRuntime(10003): 	at android.app.ActivityThread.main(ActivityThread.java:7842)
E/AndroidRuntime(10003): 	at java.lang.reflect.Method.invoke(Native Method)
E/AndroidRuntime(10003): 	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
E/AndroidRuntime(10003): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)
E/AndroidRuntime(10003): Caused by: java.lang.IllegalArgumentException: com.example.app: Targeting S+ (version 31 and above) requires that one of FLAG_IMMUTABLE or FLAG_MUTABLE be specified when creating a PendingIntent.
E/AndroidRuntime(10003): Strongly consider using FLAG_IMMUTABLE, only use FLAG_MUTABLE if some functionality depends on the PendingIntent being mutable, e.g. if it needs to be used with inline replies or bubbles.
E/AndroidRuntime(10003): 	at android.app.PendingIntent.checkFlags(PendingIntent.java:375)
E/AndroidRuntime(10003): 	at android.app.PendingIntent.getBroadcastAsUser(PendingIntent.java:645)
E/AndroidRuntime(10003): 	at android.app.PendingIntent.getBroadcast(PendingIntent.java:632)
E/AndroidRuntime(10003): 	at com.google.android.exoplayer2.ui.PlayerNotificationManager.createBroadcastIntent(PlayerNotificationManager.java:1395)
E/AndroidRuntime(10003): 	at com.google.android.exoplayer2.ui.PlayerNotificationManager.createPlaybackActions(PlayerNotificationManager.java:1351)
E/AndroidRuntime(10003): 	at com.google.android.exoplayer2.ui.PlayerNotificationManager.<init>(PlayerNotificationManager.java:658)
E/AndroidRuntime(10003): 	at com.google.android.exoplayer2.ui.PlayerNotificationManager.<init>(PlayerNotificationManager.java:568)
E/AndroidRuntime(10003): 	at com.google.android.exoplayer2.ui.PlayerNotificationManager.createWithNotificationChannel(PlayerNotificationManager.java:521)
E/AndroidRuntime(10003): 	at me.sithiramunasinghe.flutter.flutter_radio_player.core.StreamingCore.onStartCommand(StreamingCore.kt:248)
E/AndroidRuntime(10003): 	at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:4643)
E/AndroidRuntime(10003): 	... 9 more
I/Process (10003): Sending signal. PID: 10003 SIG: 9
Lost connection to device.
Exited (sigterm)

I tried this, but had no luck with it:
(android/src/main/kotlin/me/sithiramunasinghe/flutter/flutter_radio_player/core/StreamingCore)

override fun createCurrentContentIntent(player: Player): PendingIntent {
 var intent = Intent(this@StreamingCore, activity!!.javaClass)
 var contentPendingIntent = PendingIntent.getActivity(this@StreamingCore, 0, intent, PendingIntent.FLAG_IMMUTABLE );
   return contentPendingIntent;
   }

Device: Pixel 4 API 31 - Android 12.0

[✓] Flutter (Channel beta, 2.9.0-0.1.pre, on macOS 12.1 21C52 darwin-arm, locale de-DE)
[✓] Android toolchain - develop for Android devices (Android SDK version 31.0.0)
[✓] Xcode - develop for iOS and macOS (Xcode 13.1)
[✓] Chrome - develop for the web
[✓] Android Studio (version 2020.3)
[✓] VS Code (version 1.63.2)
[✓] Connected device (3 available)

[justinbeatz]

I could make it work by adding the required PendingIntent code and upgrading exoplayer to 2.14.2, if anyone still need it.

[Vasajj]

I could make it work by adding the required PendingIntent code and upgrading exoplayer to 2.14.2, if anyone still need it.

please show me how you did it

[prssvraju]

justinbeatz can you guide to solve this issue

[Sithira]

Has been updated to v2. Please check the master branch