如何处理耳机按钮的喀哒声？

Question

I have this code to handle button clicks from earphones. The problem is that my priority is low and when i click the button the radio turns on. I want to be able to give priority to my app. I tried to increase the setPriority number but it does not work.

public class MediaButtonIntentReceiver extends BroadcastReceiver {

    public MediaButtonIntentReceiver() {
        super();
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        String intentAction = intent.getAction();
        if (!Intent.ACTION_MEDIA_BUTTON.equals(intentAction)) {
            return;
        }
        KeyEvent event = (KeyEvent)intent.getParcelableExtra(Intent.EXTRA_KEY_EVENT);
        if (event == null) {
            return;
        }
        int action = event.getAction();
        if (action == KeyEvent.ACTION_MULTIPLE) {
            // do something
            Toast.makeText(context, "BUTTON PRESSED!", Toast.LENGTH_SHORT).show();
        }
        abortBroadcast();
    }

//Code in other class

   IntentFilter filter = new IntentFilter(Intent.ACTION_MEDIA_BUTTON);//"android.intent.action.MEDIA_BUTTON"
        MediaButtonIntentReceiver r = new MediaButtonIntentReceiver();
        filter.setPriority(1000); **//increasing this does not work**
        registerReceiver(r, filter);

Answer 1

You cannot register a receiver for Intent.ACTION_MEDIA_BUTTON with registerReceiver as it is handled separately by the Media framework to dispatch to the correct media app as described in the Responding to Media Buttons guide .

However, in the case where you want to handle it in the foreground, you don't need to use Intent.ACTION_MEDIA_BUTTON at all as all KeyEvent s are first sent to the active Activity via onKeyDown() (and onKeyUp() ). Therefore you can handle the KeyEvent directly:

@Override
public boolean onKeyDown (int keyCode, 
            KeyEvent event) {
  // This is the center button for headphones
  if (event.getKeyCode() == KeyEvent.KEYCODE_HEADSETHOOK) {
    Toast.makeText(context, "BUTTON PRESSED!", Toast.LENGTH_SHORT).show();
    return true;
  }
  return super.onKeyDown(keyCode, event);
}