控制其他应用程序的音频播放

解决方法 Service extends NotificationListenerService

使用的内部服务 MediaSessionManager 和 MediaController

MediaSessionManager mediaSessionManager;
ComponentName componentName;
MediaController controller;

MediaSessionManager.OnActiveSessionsChangedListener sessionsChangedListener = new MediaSessionManager.OnActiveSessionsChangedListener() {
    @Override
    public void onActiveSessionsChanged(@Nullable List<MediaController> controllers) {
        Log.d(TAG, "onActiveSessionsChanged: session is changed");
        for (MediaController controller : controllers) {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
                Log.d(TAG, "onActiveSessionsChanged: controller = " + controller.getPackageName());
                MediaMetadata meta = controller.getMetadata();
                Log.d(TAG, "onCreate: artist = " + meta.getString(MediaMetadata.METADATA_KEY_ARTIST));
                Log.d(TAG, "onCreate: song = " + meta.getString(MediaMetadata.METADATA_KEY_TITLE));
            }
        }
    }
};

@Override
public void onCreate() {
    super.onCreate();
    componentName = new ComponentName(this, TestMediaService.class);
    if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) {
        mediaSessionManager = (MediaSessionManager) getSystemService(Context.MEDIA_SESSION_SERVICE);
        mediaSessionManager.addOnActiveSessionsChangedListener(sessionsChangedListener, componentName);

        List<MediaController> controllers = mediaSessionManager.getActiveSessions(componentName);
        Log.d(TAG, "onCreate listener: controllers size = " + controllers.size());
        for (MediaController mediaController : controllers) {
            controller = mediaController;
            Log.d(TAG, "onCreate: controller = " + controller.getPackageName());
            MediaMetadata meta = controller.getMetadata();
            Log.d(TAG, "onCreate: artist = " + meta.getString(MediaMetadata.METADATA_KEY_ARTIST));
            Log.d(TAG, "onCreate: song = " + meta.getString(MediaMetadata.METADATA_KEY_TITLE));
        }
    }
}