Question

这是我的here的一个较早版本提出的问题。

我正在运行Android v8的Samsung Galaxy S7上使用android sdk 26，并尝试使用耳机上的播放/暂停按钮（HEADSETHOOK，键码79）。遵循@Commonsware和@Pawel的建议，我在主要活动中注册了接收器，该接收器现在可以正常工作，因为它可以识别何时将耳机从电话中拔出。但是，尽管可以在前台活动中使用onKeyDown时捕获按钮的按下，但BroadcastReceiver并没有将其识别为ACTION_MEDIA_BUTTON（或者据我所知其他任何内容）。发生的一切是，当我长按时会调用默认应用程序（Google助手），而短按时则什么都没有。

这是我的代码（全部包含在一个类中）：

public class MainActivity extends AppCompatActivity {

private BroadcastReceiver headsetBtnReceiver;
private AudioManager mAudioManager;
private ComponentName mReceiverComponent;

Intent playerService;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    headsetBtnReceiver = new RemoteReceiver();
    Log.e("Udp SVC", "Registering Receiver ");
    IntentFilter mediaFilter = new IntentFilter();
    mediaFilter.setPriority(2148675);
    mediaFilter.addAction(Intent.ACTION_HEADSET_PLUG);               //  <-- Working
    mediaFilter.addAction(Intent.ACTION_MEDIA_BUTTON);               //  <-- Not working
    mediaFilter.addAction(Intent.ACTION_SEARCH);                     //  <-- Not working
    mediaFilter.addAction(Intent.ACTION_SEARCH_LONG_PRESS);          //  <-- Not working
    registerReceiver(this.headsetBtnReceiver, mediaFilter);

    mAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
    mReceiverComponent = new ComponentName(getApplicationContext(), RemoteReceiver.class);
    mAudioManager.registerMediaButtonEventReceiver(mReceiverComponent);
}

@Override
public void onDestroy() {
    Log.e("UDP svc", "Destroying MainActivity");
    mAudioManager.unregisterMediaButtonEventReceiver(mReceiverComponent);
    unregisterReceiver(headsetBtnReceiver);
    finish();
    super.onDestroy();
}

public static class RemoteReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        String intentAction = intent.getAction();

        Log.e("Udp SVC","Into BroadcastReceiver : "+intentAction.toString());

        if (Intent.ACTION_MEDIA_BUTTON.equals(intent.getAction())) {
            final KeyEvent event = intent.getParcelableExtra(Intent.EXTRA_KEY_EVENT);

            if (event != null && event.getAction() == KeyEvent.KEYCODE_HEADSETHOOK) {
                Log.e("Udp SVC","BroadcastReceiver headsethook ");
                /***************
                 switch (event.getKeyCode()) {
                 case KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE:
                 context.startService(new Intent(context, PlayerService.class));
                 break;
                 }
                 **********/
            }
        }
    }
}

}

我做错了什么（如果有的话）？
HEADSETHOOK（键码79）的Intent常量是什么？
如果没有这样的常量，是否可以在IntentFilter中添加特定的键控代码？
帮助！

ACTION_MEDIA_BUTTON在BroadcastReceiver中不起作用

0 个答案: