requestLocationUpdates（）和removeUpdates（），無法使用的TimerTask

我使用Timer和TimerTask在我的服務，我調度GPS定期檢查使用此方法@服務在單獨的線程來處理 - 的onCreate（）requestLocationUpdates（）和removeUpdates（），無法使用的TimerTask

scheduleAllGPST.scheduleAtFixedRate(new AllGPSTimer(), 0, 
               everyInterval);

代碼段從我的服務類：

//class inside service class 
class AllGPSTimer extends TimerTask { 
    public void run() { 
    if (!canGetLocation) stopLocationRequest(); 
    else requestLocation(); 
} 
} 
// Service class method 
public void requestLocation() { 
    try { 
    locListener = new mylocationlistener(); 
    locationManager.requestLocationUpdates(provider, 0, 0, locListener);// Error happens at this line 
    } 
    catch (Exception e) { 
    e.printStackTrace(); 
    } 
} 
public void stopLocationRequest() { 
try { 
    locationManager.removeUpdates(locListener);// And also it happens at this line 
} 
catch (Exception e) { 
    e.printStackTrace(); 
} 
}

我收到此錯誤：

Error : 
java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare() 
at android.os.Handler.<init>(Handler.java:121) 
at android.location.LocationManager$ListenerTransport$1.<init>(LocationManager.java:139) 
at android.location.LocationManager$ListenerTransport.<init>(LocationManager.java:137) 
at android.location.LocationManager._requestLocationUpdates(LocationManager.java:708) 
at android.location.LocationManager.requestLocationUpdates(LocationManager.java:630) 
at com.mobile.sales.GPSService.requestLocation(GPSService.java:146) 
at com.mobile.sales.GPSService$AllGPSTimer.run(GPSService.java:140) 
at java.util.Timer$TimerImpl.run(Timer.java:289)

從Error，我猜這個requestLocationUpdates（）和 removeUpdates（）只能從Service類的主線程中使用，而不能從主線程的派生線程中使用。我猜對了嗎？

那麼有沒有像Activity類的runOnUiThread（runnable）Service類的方法？

請幫忙，我應該處理位置API方法和計時器任務的衍生線程？也讓我知道如果我猜測它是錯誤的。

謝謝！

來源

2012-06-01 Pradeepraj

看這個問題http://stackoverflow.com/questions/3589963/locationmanager-requestlocationupdates-and-timertask-in-android – southerton

@southerton ：我看到了整個事情和源代碼也那麼，這意味着我們不能使用定時器，而使用locationApis？如果有什麼方法，你可以簡要介紹嗎？ – Pradeepraj

你好@ Pradeepraj你注意不到，我們不應該調用線程內的任何硬件檢查控件。我們應該使用Handler。以下鏈接將幫助你。 http://developer.android.com/reference/android/os/Handler.html – itsrajesh4uguys

公共類GpsManager {

public GpsManager() 
{ 
    // TODO Auto-generated constructor stub 
} 

LocationManager lm; 
LocationListener ll; 

public void Start(Context context) 
{ 
    lm = (LocationManager) context 
      .getSystemService(Context.LOCATION_SERVICE); 


    isactive = true; 



    handler=new Handler(){ 

     @Override 
     public void handleMessage(Message msg) 
     { 

      if(isactive) 
      lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, ll); 
      super.handleMessage(msg); 
     } 
    }; 
    ll = new MyLocationListener(context, lm,handler); 
    lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, ll); 
} 

Handler handler; 
public boolean isactive; 

public void Stop() 
{ 
    lm.removeUpdates(ll); 
    isactive = false; 
} 

class MyLocationListener implements LocationListener 
{ 

    Context _con; 
    LocationManager _lm; 

    Handler _handler; 
    public MyLocationListener(Context con, LocationManager lm,Handler h) 
    { 
     _lm = lm; 
     _con = con; 
     _handler=handler; 
    } 

    @Override 
    public void onLocationChanged(Location location) 
    { 
     if (location != null) 
     { 

      Toast.makeText(
        _con, 
        "lon = " + location.getLongitude() + ". lat = " 
          + location.getLatitude(), Toast.LENGTH_SHORT) 
        .show(); 
      lm.removeUpdates(this); 
      Thread th=new Thread(new Runnable() 
      { 

       @Override 
       public void run() 
       { 
        Message msg=Message.obtain(); 
        _handler.sendMessageDelayed(msg,1000); 

       } 
      }); 
      th.run(); 
     } 

    } 

    @Override 
    public void onStatusChanged(String provider, int status, Bundle extras) 
    { 

     Toast.makeText(_con, "status change " + provider, 
       Toast.LENGTH_SHORT).show(); 

    } 

    @Override 
    public void onProviderEnabled(String provider) 
    { 

     Toast.makeText(_con, "provider enable " + provider, 
       Toast.LENGTH_SHORT).show(); 
    } 

    @Override 
    public void onProviderDisabled(String provider) 
    { 

     Toast.makeText(_con, "provider disable " + provider, 
       Toast.LENGTH_SHORT).show(); 
    } 

}

}

來源

2014-12-22 04:00:36 yosibrel

requestLocationUpdates（）和removeUpdates（），無法使用的TimerTask

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