[android-developers] Re: IllegalStateException in MediaPlayer (HTC Hero 1.5)

Anyone?.. Bueller...

On Sep 18, 5:20 am, Jason <jason.poli...@gmail.com> wrote:
> Hi all,
>
> I'm running into some state problems with MediaPlayer.  I have so far
> only seen this on one device (HTC Hero) running Android 1.5.  Stack
> trace is:
>
> java.lang.IllegalStateException
>        at android.media.MediaPlayer.prepareAsync(Native Method)
>        at
> com.carboncrystal.ro.audio.SafeMediaPlayer.prepareAsync(Unknown
> Source)
>        at com.carboncrystal.ro.audio.a.a(Unknown Source)
>        at
> com.carboncrystal.ro.audio.SafeOnCompletionListener.onCompletion(Unknown
> Source)
>
> Now that's all pretty meaningless I know, but here's the relevant
> code:
>
>         public void onCompletion(MediaPlayer mp) {
>                 mp.stop();
>                 mp.prepareAsync();
>         }
>
> The "SafeMediaPlayer" referred to above is just my hack to track down
> where the problem was (it's on a phone used by a friend in another
> country, so difficult to monitor).
>
> So basically the story is this:
>
> In an effort to avoid reloading audio every time its used, I am
> reusing the same MediaPlayer instance over and over.  In most cases, I
> don't explicitly call "stop()" because most of the sounds are short
> (sound effects that just wont squeeze into the tiny SoundPool cache)..
> so I'm using an OnCompletionListener to let me know when the sound has
> finished so I can prepare it for the next use.
>
> Now.. according to the doco:
>
> "Calling stop() stops playback and causes a MediaPlayer in the
> Started, Paused, Prepared or PlaybackCompleted state to enter the
> Stopped state.
> Once in the Stopped state, playback cannot be started until prepare()
> or prepareAsync() are called to set the MediaPlayer object to the
> Prepared state again."
>
> So ok, according to this I should be fine.. but it's a little unclear
> to me from the state transition diagram (http://developer.android.com/
> reference/android/media/MediaPlayer.html) whether the MediaPlayer
> enters the PlaybackCompleted before or after the call is made to
> onCompletion in the OnCompletionListener.
>
> It sort of seems that when onCompletion is called, the MediaPlayer is
> already in a Stopped state.  But who cares right.. calling stop() in a
> stopped state should do nothing as it's a valid state.
>
> Interestingly I don't always see the failure.. which tells me it may
> be a timing thing.  In either case, does anyone have any relevant
> experience with this?
>
> Maybe there's a call to start() sneaking in between the call to stop()
> and the call to prepareAsync() from another thread.. then again, I
> would have thought this would give me a failure on the call to
> start().. unless of course it is in a PlaybackCompleted state...
> urgh.. my head hurts.
>
> Thanks.

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