如何用广播监听器检测耳机按钮长按？

Question

我使用广播接收器来检测耳机按钮操作。我在onReceive 函数中使用此代码进行长按：

@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();

    switch (event.getKeyCode()) {
        case KeyEvent.KEYCODE_HEADSETHOOK:
            if (action == KeyEvent.FLAG_LONG_PRESS)
                Toast.makeText(context, "Long click!", Toast.LENGTH_SHORT).show();
        break;
    }
    abortBroadcast();

}

但它不起作用。问题出在哪里？有没有其他办法？

Answer 1

解决办法如下：

 @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();

    switch (event.getKeyCode()) {
        case KeyEvent.KEYCODE_HEADSETHOOK:
            if (action == KeyEvent.ACTION_UP)
                if (SystemClock.uptimeMillis() - event.getDownTime() > 2000) 
                     Toast.makeText(context, "Long click!", Toast.LENGTH_SHORT).show();
        break;
    }
    abortBroadcast();

}