Question

05-19 11:52:51.622: ERROR/MediaPlayer(1291): prepareAsync called in state 8
05-19 11:52:51.622: WARN/System.err(1291): java.lang.IllegalStateException

try {
    mp = MediaPlayer.create(
            Main.this,
            Uri.parse("http://codejanitor.us/good.mp3"));
    mp.setOnPreparedListener(new OnPreparedListener() {
        @Override
        public void onPrepared(MediaPlayer mp) {
            mp.start();
        }
    });
    try {
        mp.prepareAsync();
    } catch (IllegalStateException e) {
        e.printStackTrace();
    }
} finally {
    if (mp != null) {
        mp.release();
        mp = null;
    }
}

ALTERNATELY

If I do:

try {
    mp = MediaPlayer.create(
            AmazonClipActivity.this,
            Uri.parse("http://codejanitor.us/good.mp3"));
    mp.setOnPreparedListener(new OnPreparedListener() {
        @Override
        public void onPrepared(MediaPlayer mp) {
            mp.start();
        }
    });
} finally {
    if (mp != null) {
        mp.release();
        mp = null;
    }
}

I get:

05-19 12:22:57.472: DEBUG/MediaPlayer(1635): Couldn't open file on client side, trying server side
05-19 12:22:57.472: INFO/StagefrightPlayer(68): setDataSource('http://codejanitor.us/good.mp3')
05-19 12:22:57.482: INFO/NuHTTPDataSource(68): connect to codejanitor.us:80/good.mp3 @0
05-19 12:23:00.632: INFO/NuCachedSource2(68): ERROR_END_OF_STREAM

Answer 1

mp = MediaPlayer.create(...); is already preparing the MediaPlayer returned, so you cannot call prepare (or its variants) again (and there is no need for onPreparedListener as well).