Question

I have static method which plays music. How to return value from this method when play completed?

public static int playSample(Context context, int resid) {
    AssetFileDescriptor afd = context.getResources().openRawResourceFd(resid);

    try {
        mediaPlayer.reset();
        mediaPlayer.setDataSource(afd.getFileDescriptor(), afd.getStartOffset(), afd.getDeclaredLength());
        mediaPlayer.prepare();
        mediaPlayer.start();
        mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
            public void onCompletion(MediaPlayer mediaPlayer) {
                // from here i want return some value that play is completed
            }
        });
        afd.close();
    } catch (IllegalArgumentException e) {
        Log.e("a", "Unable to play audio queue do to exception: " + e.getMessage(), e);
    } catch (IllegalStateException e) {
        Log.e("a", "Unable to play audio queue do to exception: " + e.getMessage(), e);
    } catch (IOException e) {
        Log.e("a", "Unable to play audio queue do to exception: " + e.getMessage(), e);
    }
}

Answer 1

Why not just pass a OnCompletionListener to the static function as a ‘callback’?

public static int playSample(Context context, int resid, MediaPlayer.OnCompletionListener callback) {
    //...
    mediaPlayer.setOnCompletionListener(callback);
}

Then use the function like this:

StaticActivity.playSample(this, R.id.random, new MediaPlayer.OnCompletionListener() {
    public void onCompletion(MediaPlayer mediaPlayer) {
        // do something when playing completes
    }
}

If you don’t care about a callback in all cases, you can probably just supply null and only set the OnCompletionListener on the MediaPlayer object if it’s not null.