同时收到MEDIA_BUTTON按钮事件ACTION_DOWN和ACTION_UP

问题描述

在我的应用中，我想测量媒体按钮按下的时间.我注册了一个BroadcastReceiver，它可以监听媒体按钮的按下情况:(请原谅愚蠢的错误，因为我是初学者...)

In my app I want to measure how long the media button press was. I registered a broadcastReceiver that listens to the media button press: (please excuse stupid mistakes as I am a beginner...)

<receiver android:name="MyRec">
   <intent-filter>
      <action android:name="android.intent.action.MEDIA_BUTTON">
         <action android:name="android.intent.action.MEDIA_BUTTON"/>
      </action>
   </intent-filter>
</receiver>

broadcastReceiver在活动中激活方法(不是理想的方法，但这只是出于测试目的):

The broadcastReceiver activates a method in an activity (not ideal, but this is just for testing purposes):

public void onReceive(Context context, Intent intent) {
   KeyEvent Xevent = (KeyEvent)intent.getParcelableExtra(Intent.EXTRA_KEY_EVENT);
   MainActivity inst = MainActivity.instance();
   if ((Xevent.getAction() == KeyEvent.ACTION_DOWN)){
      inst.startTimer();
      }
   else if ((Xevent.getAction() == KeyEvent.ACTION_UP)) {
      inst.stopTimer();
   }
}

当调用startTimer()时，该活动占用系统时间，而当调用stopTimer并显示差异时，该活动再次占用系统时间:

The activity takes system time when startTimer() is called and then again when stopTimer is called and shows the diff:

public void startTimer(){
    pressTime = System.currentTimeMillis();
}

public void stopTimer(){
    pressDuration = System.currentTimeMillis() - pressTime;
    TextView timerTextView = (TextView)findViewById(R.id.timerText);
    timerTextView.setText(Long.toString(pressDuration));
}

问题是，从我看到的两个事件中，当我松开按钮时，两个事件被同时调用，最终使计时器计数的时间很短(几毫秒)，这与时间无关我按下按钮的时间.

The issue is that from what I see both events are called at the same time, both when I let go of the button, what eventually makes the timer count a very short time period (few millisecond) that are not related to the duration I press the button.

我在做什么错了?

推荐答案

您不需要使用自己的计时器.收到KeyEvent.ACTION_UP操作时，可以使用event参数的getDownTime和getEventTime方法.

You don't need to use your own timers. You can use the getDownTime and getEventTime methods of the event parameter when receiving the KeyEvent.ACTION_UP action.

此外，清单中不需要嵌套的<action android:name="android.intent.action.MEDIA_BUTTON"/>

Also, The nested <action android:name="android.intent.action.MEDIA_BUTTON"/> in your manifest is not required

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