相关疑难解决方法(0)

我有一个带单键的耳机,按下按钮时想要做一个简单的Toast.

现在我有以下代码:

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_DOWN) {
    // do something
        Toast.makeText(context, "BUTTON PRESSED!", Toast.LENGTH_SHORT).show(); 
    }
    abortBroadcast();
}
}

我的主要活动如下:

public class mainActivity extends Activity {

/** Called when the activity is first created. */
@Override
public void …