Question

我成功开发了Android应用程序，借助接收器类计算电源按钮，并在后台运行更新服务类，现在我想插入记录数据库当任何人按下电源按钮3到5次快速（在几秒钟内可能是2到4秒）。所有工作正常，但问题是服务在后台运行，所以当用户随便按电源键（即打开和关闭手机屏幕）时，它将计数。那么，如何停止计算休闲或正常的电源按钮。另外我的问题是在后台运行的服务可以重置服务，以便在用户想要插入记录时创建新的请求。提前致谢！这是我的代码： -

主页

   {Home.this.startService(new Intent(Home.this, UpdateService.class));}

我的UpdateService

 @Override
 public void onCreate() {
     super.onCreate();

      //register receiver that handles screen on and screen off logic

        IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
        filter.addAction(Intent.ACTION_SCREEN_OFF);     
        mReceiver = new MyReceiver(UpdateService.this);
        registerReceiver(mReceiver, filter);




 }

 @Override
 public void onDestroy() {

     unregisterReceiver(mReceiver);
     Log.i("onDestroy Reciever", "Called");
     super.onDestroy();

 }

 @Override
 public void onStart(Intent intent, int startId) {

}

MyReceiver

public class MyReceiver extends BroadcastReceiver {

 private static int countPowerOff=0;
 private boolean screenOff;
 private UpdateService updateservice=null;

public MyReceiver (UpdateService UpdateService)
{
       this.updateservice=UpdateService;             
}

@Override
public void onReceive(Context context, Intent intent) {


        if(intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) 
        {
        countPowerOff++
        }
        else if(intent.getAction().equals(Intent.ACTION_SCREEN_ON)) 
        { 
        }
     if(countPowerOff > 3)
        {
         //record insert 
        }

}

Answer 1

使用Hander回调实现点击计数器的重置。

public class MyReceiver extends BroadcastReceiver { 

    private static final int POWER_OFF_TIMEOUT = 500;
    private Handler handler = new Handler();
    private Runnable powerOffCounterReset = new PowerOfTimeoutReset();

    private int countPowerOff = 0;
    private boolean screenOff;
    private UpdateService updateService = null;


    public MyReceiver (UpdateService updateService) {
         this.updateService = updateService;
    } 

    @Override 
    public void onReceive(Context context, Intent intent) { 
        if(intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) { 
         countPowerOff++  
       } else if(intent.getAction().equals(Intent.ACTION_SCREEN_ON)) { } 

      if(countPowerOff > 3) { 
            //record insert 
           countPowerOff = 0; 
           canclePowerOffTimeout(); 
      } else { 
           resetPowerOffTimeout();
      }
    }

    private void resetPowerOffTimeout() {
          canclePowerOffTimeout();
          startPowerOffTimeout();
    }

    private void startPowerOffTimeout() {
         handler.postDelayed( powerOffCounterReset, POWER_OFF_TIMEOUT );
    }

    private void canclePowerOffTimeout() {
        handler.removeCallback( powerOffCounterReset );
    }


    private class PowerOfTimeoutReset implements Runnable {

        public void run() {
            countPowerOff = 0;
        }

    }

}

Answer 2

试试这个。在您的服务中制作公共方法：

    private int counter = 0;

    private CountDownTimer timer = new CountDownTimer(2000, 1000) {
        @Override
        public void onTick(long l) {

        }

        @Override
        public void onFinish() {
            counter = 0;
        }
    };

    public void count(){
        counter++;
        if (counter == 3) {
            //do your staff
            return;
        }

        timer.cancel();
        timer.start();
   }

并且在onReceive（）方法的接收器中只需调用service.count（）

顺便说一下，即使用户没有按下电源按钮，屏幕也可能会关闭。此外，您只计算每隔一秒钟 - 当屏幕关闭时，按下电源按钮将其打开，但您不会计数。为什么不处理电源按钮？它需要

    <uses-permission android:name="android.permission.PREVENT_POWER_KEY" />

许可。代码是：

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        Log.d("111", "keydown: " + event.getKeyCode());
        if (keyCode == KeyEvent.KEYCODE_POWER) {
            //call service.count()
        }
        return super.onKeyDown(keyCode, event);
    }

在给定时间内电源按钮计数

2 个答案: