java.lang.NullPointerException: Attempt to invoke virtual method 'android.app.Application android.app.Activity.getApplication()' on a null object reference

[zhancheng]

E/AndroidRuntime( 8696): java.lang.NullPointerException: Attempt to invoke virtual method 'android.app.Application android.app.Activity.getApplication()' on a null object reference
E/AndroidRuntime( 8696): 	at com.github.adee42.keyboardvisibility.KeyboardVisibilityPlugin.registerWith(KeyboardVisibilityPlugin.java:107)
E/AndroidRuntime( 8696): 	at io.flutter.plugins.GeneratedPluginRegistrant.registerWith(GeneratedPluginRegistrant.java:63)
E/AndroidRuntime( 8696): 	at im.weshine.haipei.WeshineFlutterApp.registerWith(WeshineFlutterApp.java:91)
E/AndroidRuntime( 8696): 	at com.ryanheise.audioservice.AudioServicePlugin$ClientHandler$4.onPlay(AudioServicePlugin.java:271)
E/AndroidRuntime( 8696): 	at com.ryanheise.audioservice.AudioService$MediaSessionCallback$1.run(AudioService.java:536)
E/AndroidRuntime( 8696): 	at com.ryanheise.audioservice.AudioService$MediaSessionCallback.play(AudioService.java:552)
E/AndroidRuntime( 8696): 	at com.ryanheise.audioservice.AudioService$MediaSessionCallback.onPlay(AudioService.java:534)
E/AndroidRuntime( 8696): 	at android.support.v4.media.session.MediaSessionCompat$Callback$StubApi21.onPlay(MediaSessionCompat.java:1405)
E/AndroidRuntime( 8696): 	at android.support.v4.media.session.MediaSessionCompatApi21$CallbackProxy.onPlay(MediaSessionCompatApi21.java:196)
E/AndroidRuntime( 8696): 	at android.media.session.MediaSession$CallbackMessageHandler.handleMessage(MediaSession.java:1486)
E/AndroidRuntime( 8696): 	at android.os.Handler.dispatchMessage(Handler.java:106)
E/AndroidRuntime( 8696): 	at android.os.Looper.loop(Looper.java:207)
E/AndroidRuntime( 8696): 	at android.app.ActivityThread.main(ActivityThread.java:6867)
E/AndroidRuntime( 8696): 	at java.lang.reflect.Method.invoke(Native Method)
E/AndroidRuntime( 8696): 	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
E/AndroidRuntime( 8696): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:876)

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, v1.9.1+hotfix.6, on Mac OS X 10.14.6 18G95, locale
    zh-Hans-CN)

[!] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
    ! Some Android licenses not accepted.  To resolve this, run: flutter doctor
      --android-licenses
[✓] Xcode - develop for iOS and macOS (Xcode 11.2.1)
[✓] Android Studio (version 3.5)
[✓] Connected device (2 available)

! Doctor found issues in 1 category.

[zhancheng]

when i remove the KeyboardVisibilityPlugin from my app，then it thown

java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.Context android.content.Context.getApplicationContext()' on a null object reference
E/AndroidRuntime( 9864): 	at com.magugi.plugin.volume_watcher.VolumeChangeObserver.<init>(VolumeChangeObserver.java:37)
E/AndroidRuntime( 9864): 	at com.magugi.plugin.volume_watcher.VolumeWatcherPlugin.<init>(VolumeWatcherPlugin.java:22)
E/AndroidRuntime( 9864): 	at com.magugi.plugin.volume_watcher.VolumeWatcherPlugin.registerWith(VolumeWatcherPlugin.java:30)
E/AndroidRuntime( 9864): 	at io.flutter.plugins.GeneratedPluginRegistrant.registerWith(GeneratedPluginRegistrant.java:74)
E/AndroidRuntime( 9864): 	at im.weshine.haipei.WeshineFlutterApp.registerWith(WeshineFlutterApp.java:90)
E/AndroidRuntime( 9864): 	at com.ryanheise.audioservice.AudioServicePlugin$ClientHandler$4.onPlay(AudioServicePlugin.java:271)
E/AndroidRuntime( 9864): 	at com.ryanheise.audioservice.AudioService$MediaSessionCallback$1.run(AudioService.java:536)
E/AndroidRuntime( 9864): 	at com.ryanheise.audioservice.AudioService$MediaSessionCallback.play(AudioService.java:552)
E/AndroidRuntime( 9864): 	at com.ryanheise.audioservice.AudioService$MediaSessionCallback.onPlay(AudioService.java:534)
E/AndroidRuntime( 9864): 	at android.support.v4.media.session.MediaSessionCompat$Callback$StubApi21.onPlay(MediaSessionCompat.java:1405)
E/AndroidRuntime( 9864): 	at android.support.v4.media.session.MediaSessionCompatApi21$CallbackProxy.onPlay(MediaSessionCompatApi21.java:196)
E/AndroidRuntime( 9864): 	at android.media.session.MediaSession$CallbackMessageHandler.handleMessage(MediaSession.java:1486)
E/AndroidRuntime( 9864): 	at android.os.Handler.dispatchMessage(Handler.java:106)
E/AndroidRuntime( 9864): 	at android.os.Looper.loop(Looper.java:207)
E/AndroidRuntime( 9864): 	at android.app.ActivityThread.main(ActivityThread.java:6867)
E/AndroidRuntime( 9864): 	at java.lang.reflect.Method.invoke(Native Method)
E/AndroidRuntime( 9864): 	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
E/AndroidRuntime( 9864): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:876)

[ryanheise]

Hi @zhancheng

Please search my README for NullPointerException for an explanation.

[zhancheng]

@ryanheise thanks

[github-actions]

This issue has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs, or use StackOverflow if you need help with audio_service.