Question

我正在试图找出像Spotify这样的应用程序如何在屏幕关闭或锁定时捕获耳机按钮。我目前能够使用我的类HeadSetActionButtonReciever捕获按钮按下，只有当应用程序在前台时。但是，当应用程序处于后台时，我无法捕获这些点击。有人可以向我解释为什么会这样，以及如何在后台捕获它？

public class HeadsetActionButtonReceiver extends BroadcastReceiver {

public static Delegate delegate;

private static AudioManager mAudioManager;
private static ComponentName mRemoteControlResponder;

private static int doublePressSpeed = 300; // double keypressed in ms
private static Timer doublePressTimer;
private static int counter;

public interface Delegate {
    void onMediaButtonSingleClick();
    void onMediaButtonDoubleClick();
}

@Override
public void onReceive(Context context, Intent intent) {
    if (intent == null || delegate == null || !Intent.ACTION_MEDIA_BUTTON.equals(intent.getAction()))
        return;

    KeyEvent keyEvent = (KeyEvent) intent.getExtras().get(Intent.EXTRA_KEY_EVENT);
    if (keyEvent == null || keyEvent.getAction() != KeyEvent.ACTION_DOWN) return;

    counter++;
    if (doublePressTimer != null) {
        doublePressTimer.cancel();
    }
    doublePressTimer = new Timer();
    doublePressTimer.schedule(new TimerTask() {

        @Override
        public void run() {
            if (counter == 1) {
                delegate.onMediaButtonSingleClick();
            } else {
                delegate.onMediaButtonDoubleClick();
            }
            counter = 0;
        }
    }, doublePressSpeed);
}

public static void register(final Context context) {
    mAudioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
    mRemoteControlResponder = new ComponentName(context, HeadsetActionButtonReceiver.class);
    mAudioManager.registerMediaButtonEventReceiver(mRemoteControlResponder);
}

public static void unregister(final Context context) {
    mAudioManager.unregisterMediaButtonEventReceiver(mRemoteControlResponder);
    if (doublePressTimer != null) {
        doublePressTimer.cancel();
        doublePressTimer = null;
    }
}
}

Answer 1

问题是我没有MediaSession。 Spotify等应用使用MediaSession来捕获后台点击次数。应用程序在后台查找最后一个活动的mediaSession，如果它不活动，那么它将尝试重新启动它（如果在后台）。

编辑：如果您有MediaSession，则根本不需要我所包含的类来捕获媒体按钮。

如何在屏幕锁定时捕获媒体按钮？

1 个答案: