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Stop / release media planner in onDestory () throws NullPointerException

I'm trying to stop and release a MediaPlayer object in onDestroy (), but the application continues to crash. Here is the code:

void StartSound(final String ReaderPath) { mediaplayer = MediaPlayer.create(test2.this, Uri.parse(ReaderPath)); try { mediaplayer.start(); mediaplayer.setOnCompletionListener(new OnCompletionListener() { @Override public void onCompletion(MediaPlayer mp) { current++; try { mp.reset(); mp.setDataSource(ReaderPath); mp.prepare(); } catch (Exception e) { e.printStackTrace(); } mp.start(); } }); } catch (Exception e) { } } @Override protected void onPause() { if (mediaplayer != null && mediaplayer.isPlaying()) mediaplayer.pause(); super.onPause(); } @Override protected void onStop() { if (mediaplayer != null && mediaplayer.isPlaying()) { mediaplayer.release(); mediaplayer.stop(); } super.onDestroy(); }

Logcat:

 08-21 22:52:26.512: E/AndroidRuntime(16410): java.lang.RuntimeException: Unable to destroy activity {com.example.test/com.example.test.test2}: java.lang.NullPointerException 08-21 22:52:26.512: E/AndroidRuntime(16410): at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:3235) 08-21 22:52:26.512: E/AndroidRuntime(16410): at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:3253) 08-21 22:52:26.512: E/AndroidRuntime(16410): at android.app.ActivityThread.access$1200(ActivityThread.java:132) 08-21 22:52:26.512: E/AndroidRuntime(16410): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1190) 08-21 22:52:26.512: E/AndroidRuntime(16410): at android.os.Handler.dispatchMessage(Handler.java:99) 08-21 22:52:26.512: E/AndroidRuntime(16410): at android.os.Looper.loop(Looper.java:137) 08-21 22:52:26.512: E/AndroidRuntime(16410): at android.app.ActivityThread.main(ActivityThread.java:4575) 08-21 22:52:26.512: E/AndroidRuntime(16410): at java.lang.reflect.Method.invokeNative(Native Method) 08-21 22:52:26.512: E/AndroidRuntime(16410): at java.lang.reflect.Method.invoke(Method.java:511) 08-21 22:52:26.512: E/AndroidRuntime(16410): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 08-21 22:52:26.512: E/AndroidRuntime(16410): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 08-21 22:52:26.512: E/AndroidRuntime(16410): at dalvik.system.NativeStart.main(Native Method) 08-21 22:52:26.512: E/AndroidRuntime(16410): Caused by: java.lang.NullPointerException 08-21 22:52:26.512: E/AndroidRuntime(16410): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1406) 08-21 22:52:26.512: E/AndroidRuntime(16410): at android.support.v4.app.FragmentManagerImpl.dispatchDestroy(FragmentManager.java:1876) 08-21 22:52:26.512: E/AndroidRuntime(16410): at android.support.v4.app.FragmentActivity.onDestroy(FragmentActivity.java:316) 08-21 22:52:26.512: E/AndroidRuntime(16410): at android.app.Activity.performDestroy(Activity.java:4629) 08-21 22:52:26.512: E/AndroidRuntime(16410): at android.app.Instrumentation.callActivityOnDestroy(Instrumentation.java:1079) 08-21 22:52:26.512: E/AndroidRuntime(16410): at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:3222) 08-21 22:52:26.512: E/AndroidRuntime(16410): ... 11 more

Why is this?

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2 answers

Why are you calling super.onDestroy () from your onStop () method? You should call super.onStop (). Or is it an input error?

You probably call stop() in MediaPlayer after you call release() . After you called release() , MediaPlayer invalid and is no longer available.

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The correct way to stop and release the MediaPlayer control inside onDestroy() :

 @Override protected void onDestroy() { if (mediaplayer != null) { mediaplayer.stop(); mediaplayer = null; } super.onDestroy(); }
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