android - Android 4.4 - デフォルトの音楽プレーヤーを再生する

Question

これが Kitkat で機能しなくなった理由と解決方法を誰か教えてもらえますか?

    private Intent player;
    player = new Intent(Intent.ACTION_MEDIA_BUTTON);
    synchronized (this) {
        player.putExtra(Intent.EXTRA_KEY_EVENT, new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_MEDIA_PLAY));
        sendOrderedBroadcast(player, null);

        player.putExtra(Intent.EXTRA_KEY_EVENT, new KeyEvent(KeyEvent.ACTION_UP, KeyEvent.KEYCODE_MEDIA_PLAY));
        sendOrderedBroadcast(player, null);
    }

Answer 1

API レベル 19 には、この目的のために特別に作成された新しいメソッド AudioManager.dispatchMediaKeyEvent(KeyEvent) があります。

http://developer.android.com/reference/android/media/AudioManager.html#dispatchMediaKeyEvent(android.view.KeyEvent)

このコードはキットカットで動作します:

AudioManager am = (AudioManager)context.getSystemService(Context.AUDIO_SERVICE);

long eventtime = SystemClock.uptimeMillis() - 1;
KeyEvent downEvent = new KeyEvent(eventtime, eventtime, KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE, 0);
am.dispatchMediaKeyEvent(downEvent);

eventtime++;
KeyEvent upEvent = new KeyEvent(eventtime,eventtime,KeyEvent.ACTION_UP,KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE, 0);         
am.dispatchMediaKeyEvent(upEvent);