Question

我需要跟踪应用用户在特定位置花费的时间。请建议我一个优化的方法。我查看了这个link。

我可以使用上面的方法来获取位置，但是我的方法应该达到什么目的？

Answer 1

主要想法是以定义的时间间隔获取当前用户位置，如果位置超出您的区域，我们可以计算时差

按照以下步骤

 long time1 = new Date().getTime();
 long time2;

 double firstLat, firstLog;
 // fetch current user location using this link
 // https://developer.android.com/training/location/retrieve-current.html

 //Declare the timer
 Timer timer = new Timer();
 //Set the schedule function and rate
 timer.scheduleAtFixedRate(new TimerTask() {

      @Override
      public void run() {
         // Called each time when 1000 milliseconds (1 second) (the period parameter)

         double curLat, curLog;

         // fetch current user location using this link
         // https://developer.android.com/training/location/retrieve-current.html

         if(!isUserInRegion(firstLat,firstLog,curLat,curLog){
             time2 = new Date().getTime();
             timer.cancel();
             timer.purge();
      }

 },
 //Set how long before to start calling the TimerTask (in milliseconds)
 0,
 //Set the amount of time between each execution (in milliseconds)
 1000);
 long timeDiff = time2 - time1;


 private boolean isUserInRegion(double firstLat, double firstLog, double curLat, double curLog){
      int r = 0.005; // Any radious
      double dx = curLat - firstLat;
      double dy = curLog - firstLog;
      return dx * dx + dy * dy <= r * r;
 }

希望这个技巧对你有用:)

使用Google API跟踪Android在某个位置所花费的时间

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