相关疑难解决方法(0)

我正在为Android OS 4.0.3(ICS)编写一个Android应用程序.问题是我没有从BroadcastReceive的onReceive()方法获取Log.d()的输出,这意味着我的应用程序没有正确处理广播.

我已经阅读了关于如何在单击ACTION_MEDIA_BUTTON时运行代码的无数问题.当我的工作不起作用时,我甚至复制+粘贴代码,只是为了看看它是否可行.

我想要处理的ACTION_MEDIA_BUTTON是耳机上的单个按钮,允许用户接听/结束通话,播放/暂停音乐.当我点击它时,而不是我的应用程序处理此按钮,我的Nexus S Android上的股票音乐播放器开始播放一首歌曲.

我没有将我的代码放在另一个类中,也许这就是为什么它不起作用？

这是在onCreate()方法上找到的代码(这个特定的代码是在我编写的代码无效后从网站上复制的):

IntentFilter mediaButtonFilter = new IntentFilter(
            Intent.ACTION_MEDIA_BUTTON);
    mediaButtonFilter.setPriority(IntentFilter.SYSTEM_HIGH_PRIORITY);
    BroadcastReceiver brMediaButton = new BroadcastReceiver() {
        public void onReceive(Context context, Intent intent) {
            Log.d("Event", "Media button!");
            this.abortBroadcast();

            KeyEvent key = (KeyEvent) intent.getParcelableExtra(Intent.EXTRA_KEY_EVENT);
            if(key.getAction() == KeyEvent.ACTION_UP) {
                int keycode = key.getKeyCode();
                if(keycode == KeyEvent.KEYCODE_MEDIA_NEXT) {
                    Log.d("TestApp", "Next Pressed");
                } else if(keycode == KeyEvent.KEYCODE_MEDIA_PREVIOUS) {
                    Log.d("TestApp", "Previous pressed");
                } else if(keycode == KeyEvent.KEYCODE_HEADSETHOOK) {
                    Log.d("TestApp", "Head Set Hook pressed");
                }
            }

        } …

目标是拦截来自耳机的广播以及最终的蓝牙,以响应来自耳机的不同类型的点击以改变媒体播放器.此解决方案适用于ICS之前的所有版本.这是我尝试过的一些代码和事情:

....
private BroadcastReceiver mediaButtonReceiver = new MediaButtonIntentReceiver();
....
public void onCreate() {
    ...
    IntentFilter mediaFilter = new IntentFilter(Intent.ACTION_MEDIA_BUTTON);
    mediaFilter.setPriority(2147483647); // this is bad...I know
    this.registerReceiver(mediaButtonReceiver, mediaFilter);
    ...
}

public class MediaButtonIntentReceiver extends BroadcastReceiver {

    private KeyEvent event;

    public MediaButtonIntentReceiver() {
        super();
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        String intentAction = intent.getAction();
        if (!Intent.ACTION_MEDIA_BUTTON.equals(intentAction)) {
            return;
        }
        event = (KeyEvent)intent.getParcelableExtra(Intent.EXTRA_KEY_EVENT);
        if (event == null) {
            return;
        }
        try {
            int action = event.getAction();

            switch(action) {

                case KeyEvent.ACTION_UP …

我试着花时间System.currentTimeMillis(),而不是用户按下媒体按钮.但回调是在媒体按钮再次上升时执行的action == KeyEvent.ACTION_UP.

我不想在我的解决方案中使用BroadcastReceiver.

这是我的代码:

    MediaSession audioSession = new MediaSession(getApplicationContext(), "TAG");
    audioSession.setCallback(new MediaSession.Callback() {

        @Override
        public boolean onMediaButtonEvent(final Intent mediaButtonIntent) {
            String intentAction = mediaButtonIntent.getAction();

            if (Intent.ACTION_MEDIA_BUTTON.equals(intentAction))
            {
                KeyEvent event = (KeyEvent)mediaButtonIntent.getParcelableExtra(Intent.EXTRA_KEY_EVENT);
                if (event != null)
                {
                    int action = event.getAction();
                    if (action == KeyEvent.ACTION_DOWN) {
                        long stopTimeOfGame_millis = System.currentTimeMillis();
                        UtilsRG.info("time stopped: " +stopTimeOfGame_millis);

                    }
                    if (action == KeyEvent.ACTION_UP) {
                         long test = System.currentTimeMillis();
                         UtilsRG.info("time stopped up: " +test);

                    }
                }

            }
            return super.onMediaButtonEvent(mediaButtonIntent);
        }



    }); …