Android MediaPlayer setDataSource() Throwing IllegalStateException Error

Question

While I use almost the same code to play two videos, the first works perfectly, but the second does not. When I press the next video button, the program crashed with:

WARN/System.err(15726): java.lang.IllegalStateException
WARN/System.err(15726):     at android.media.MediaPlayer.setDataSource(Native Method)

Source code:

the first play code:

    mediaPlayer = new MediaPlayer();
    playURI = receiveIntent.getStringExtra("playURI");
    showDebugInfo("play uri "+playURI);
    Log.e("Gplayer on create", "play uri "+playURI);
    try {
        mediaPlayer.setDataSource(playURI);
    } catch (IllegalArgumentException e) {
        Log.v(LOGTAG, e.getMessage());
        finish();
    } catch (IllegalStateException e) {
        Log.v(LOGTAG, e.getMessage());
        finish();
    } catch (IOException e) {
        Log.v(LOGTAG, e.getMessage());
        finish();
    }

when press next button it runs the following code:

   String uri = listAdapter.getItem(position).getItem().getFirstResource().getValue();
    showDebugInfo(" Uri "+uri);
    if(mediaPlayer != null){
        mediaPlayer.stop();
    }
    try {
        mediaPlayer.reset();
        mediaPlayer.setDataSource(uri);
        mediaPlayer.prepareAsync();
    } catch (IllegalStateException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
        finish();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
        finish();
    }

Why does this happen? and I check the two parts only the different that, the first one is new a mediaplayer and the second is let the mediaplayer stop and reset then the same.

Answer 1

I had the same problem.

You need to call mediaPlayer.reset(); before you are calling in the second video mediaPlayer.setDataSource(uri); the reason is, because the function mediaPlayer.setDataSource(uri); can be called only on idle state, and mediaPlayer.reset(); is the function that take you to idle state.

I understand it from this answer, even though the question is a bit different.