IllegalStateException in MediaPlayer#Pause


IllegalStateException in MediaPlayer#Pause



I uploaded my app at google console and in prelaunch report , in 2 devices only, there was this issue java.lang.IllegalStateException


FATAL EXCEPTION: ControllerMessenger
Process: com.wolframite.manos.crack_the_code, PID: 11744
java.lang.IllegalStateException
at android.media.MediaPlayer.isPlaying(Native Method)
at com.wolframite.manos.crack_the_code.Music$1.onReceive(Music.java:36)
at android.support.v4.content.LocalBroadcastManager.executePendingBroadcasts(LocalBroadcastManager.java:311)
at android.support.v4.content.LocalBroadcastManager.access$000(LocalBroadcastManager.java:47)
at android.support.v4.content.LocalBroadcastManager$1.handleMessage(LocalBroadcastManager.java:120)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.support.test.espresso.base.Interrogator.a(Interrogator.java:19)
at android.support.test.espresso.base.UiControllerImpl.a(UiControllerImpl.java:142)
at android.support.test.espresso.base.UiControllerImpl.a(UiControllerImpl.java:134)
at android.support.test.espresso.base.UiControllerImpl.a(UiControllerImpl.java:34)
at android.support.test.espresso.action.MotionEvents.a(MotionEvents.java:74)
at android.support.test.espresso.action.MotionEvents.a(MotionEvents.java:52)
at android.support.test.espresso.action.Tap.c(Tap.java:9)
at android.support.test.espresso.action.Tap.a(Tap.java:19)
at android.support.test.espresso.action.Tap$1.b(Tap.java:2)
at android.support.test.espresso.action.GeneralClickAction.perform(GeneralClickAction.java:22)
at android.support.test.espresso.ViewInteraction$SingleExecutionViewAction.perform(ViewInteraction.java:9)
at android.support.test.espresso.ViewInteraction.a(ViewInteraction.java:78)
at android.support.test.espresso.ViewInteraction.a(ViewInteraction.java:94)
at android.support.test.espresso.ViewInteraction$1.call(ViewInteraction.java:3)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.Handler.handleCallback(Handler.java:746)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5459)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)



I don't know what to do.
What is this issue and what more do I need to upload to help solve this.



The music class which is used to play music in the app and receives a broadcast when app goes in background to stop music and when app goes in foreground to resume it where line 36 is player.pause() :


public class Music extends Service {
private MediaPlayer player;

@Override
public IBinder onBind(Intent intent) {
return null;
}
public void onCreate() {
player = MediaPlayer.create(this, R.raw.music);
player.setLooping(true);
LocalBroadcastManager.getInstance(this).registerReceiver(StateReceiver, new IntentFilter("status"));

}
private final BroadcastReceiver StateReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String status = intent.getStringExtra("status");
if (parseInt(String.valueOf(status)) == 0) {
player.pause();
} else if (parseInt(String.valueOf(status)) == 1) {
if (player != null)
player.start();
else {
player = MediaPlayer.create(Music.this, R.raw.music);
player.setLooping(true);
player.start();
}
} else if(player != null){
player.stop();
player.release();
}

}
};
public int onStartCommand(Intent intent, int flags, int startId) {
player.start();
return Service.START_NOT_STICKY;
}
public void onDestroy() {
player.stop();
player.release();
LocalBroadcastManager.getInstance(this).unregisterReceiver(StateReceiver);
stopSelf();
super.onDestroy();

}



This question has not received enough attention.





what is at Music.java:36 ?
– rushi
Jun 29 at 14:35





In 36 is player.pause() , player = MediaPlayer.create(this, R.raw.music);
– user9924189
Jun 29 at 14:38



player.pause()





Where is this line placed (in OnCreate?)? Also, add all relevant code in question
– rushi
Jun 29 at 14:40





The error is fairly self-explanatory. There is a point in your com.wolframite.manos.crack_the_code.Music at line 36 where, probably in response to a broadcast, you pause a MusicPlayer that has not been initialized (i.e. setDataSource has not been called or something like that). Post the code for that class, or if it is too large, the code for the method in which that call is made.
– Leo Aso
Jun 29 at 14:43


com.wolframite.manos.crack_the_code.Music


MusicPlayer


setDataSource





@LeoAso Posted the code
– user9924189
Jun 29 at 14:44




1 Answer
1



In order to avoid these type of errors you can create a utility class which acts as a secure wrapper around the MediaPlayer methods which sometimes throw unexpected exception and crash your app.


MediaPlayer



I have used code in a class called MediaPlayerUtils like the example below to avoid these types of behaviours and add an extra layer of safety to my apps:


MediaPlayerUtils


public static void pause(MediaPlayer mediaPlayer) {
if (mediaPlayer != null) {
try {
if (mediaPlayer.isPlaying()) {
mediaPlayer.pause();
}
} catch (Exception e) {
Log.w(MediaPlayerUtil.class.getName(),
String.format("Failed to stop media player: %s", e));
}
}
}



You then have to use instead of:


player.pause(); // not safe



this code:


MediaPlayerUtils.pause(player); // safe



You can add similar methods to the for MediaPlayer.stop(), like e.g:;


MediaPlayer.stop()


public static void stop(MediaPlayer mediaPlayer) {
if (mediaPlayer != null) {
try {
if (mediaPlayer.isPlaying()) {
mediaPlayer.stop();
}
resetRelease(mediaPlayer);
} catch (Exception e) {
Log.e(MediaPlayerUtil.class.getName(),
String.format("Failed to stop media player: %s", e));
}
}
}






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