了java.lang.RuntimeException：問題與Looper.prepare（）

我利用的AsyncTask在我的應用程序和代碼，了java.lang.RuntimeException：問題與Looper.prepare（）

protected Void doInBackground(Void... params) { 
     // Get the current thread's token 

     try { 
      synchronized (this) { 
       Looper.prepare();     
       if (isCancelled()) { 

       } else {       
        gpsCoordinates = new GetGpsCoordinates(); 
        location = gpsCoordinates.getLocation(context); 

        int counter = 0; 
        while (counter <= 4) { 
         this.wait(850); 
         counter++; 
         publishProgress((int) (counter) * 50); 
        } 
       } 
      } 
     } catch (InterruptedException e) { 
      e.printStackTrace(); 
     } 

     return null; 
    }

和GetGpsCoordinates.class，

public Location getLocation(Context mContext) { 
    try { 
     locationManager = (LocationManager) mContext 
       .getSystemService(LOCATION_SERVICE); 
     Criteria criteria = new Criteria(); 
     criteria.setAccuracy(Criteria.ACCURACY_FINE); 

     // getting GPS status 
     isGPSEnabled = locationManager 
       .isProviderEnabled(LocationManager.GPS_PROVIDER); 

     // getting network status 
     isNetworkEnabled = locationManager 
       .isProviderEnabled(LocationManager.NETWORK_PROVIDER); 

     if (!isGPSEnabled && !isNetworkEnabled) { 
      // no network provider is enabled 
     } else { 
      this.canGetLocation = true; 
      // First get location from Network Provider 
      Log.d("","collecting lat,lng details"); 
      if (isNetworkEnabled) {    
       locationManager.requestLocationUpdates(
         LocationManager.NETWORK_PROVIDER, 
         MIN_TIME_BW_UPDATES, 
         MIN_DISTANCE_CHANGE_FOR_UPDATES, this); 
       Log.d("Network", "Network"); 
       if (locationManager != null) { 
        location = locationManager 
          .getLastKnownLocation(LocationManager.NETWORK_PROVIDER); 
        if (location != null) { 
         latitude = location.getLatitude(); 
         longitude = location.getLongitude(); 
        } 
       } 
      } 
      // if GPS Enabled get lat/long using GPS Services 
      if (isGPSEnabled) { 
       if (location == null) { 
        locationManager.requestLocationUpdates(
          LocationManager.GPS_PROVIDER, 
          MIN_TIME_BW_UPDATES, 
          MIN_DISTANCE_CHANGE_FOR_UPDATES, this); 
        Log.d("GPS Enabled", "GPS Enabled"); 
        if (locationManager != null) { 
         location = locationManager 
           .getLastKnownLocation(LocationManager.GPS_PROVIDER); 
         if (location != null) { 
          latitude = location.getLatitude(); 
          longitude = location.getLongitude(); 

         } 
        } 
       } 
      } 
     } 

    } catch (Exception e) { 
     e.printStackTrace(); 
    } 

    return location; 
}

我如果我使用looper.prepare（），我會變得更加不重視。這是我的logcat，

06-05 17:26:16.410: E/AndroidRuntime(19075): java.lang.RuntimeException: An error occured while executing doInBackground() 
06-05 17:26:16.410: E/AndroidRuntime(19075): at android.os.AsyncTask$3.done(AsyncTask.java:200) 
06-05 17:26:16.410: E/AndroidRuntime(19075): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:274) 
06-05 17:26:16.410: E/AndroidRuntime(19075): at java.util.concurrent.FutureTask.setException(FutureTask.java:125) 
06-05 17:26:16.410: E/AndroidRuntime(19075): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:308) 
06-05 17:26:16.410: E/AndroidRuntime(19075): at java.util.concurrent.FutureTask.run(FutureTask.java:138) 
06-05 17:26:16.410: E/AndroidRuntime(19075): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088) 
06-05 17:26:16.410: E/AndroidRuntime(19075): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581) 
06-05 17:26:16.410: E/AndroidRuntime(19075): at java.lang.Thread.run(Thread.java:1019) 
06-05 17:26:16.410: E/AndroidRuntime(19075): Caused by: java.lang.RuntimeException: Only one Looper may be created per thread 
06-05 17:26:16.410: E/AndroidRuntime(19075): at android.os.Looper.prepare(Looper.java:74) 
06-05 17:26:16.410: E/AndroidRuntime(19075): at com.bu.PropertySearchTypes.CameraSearch$LoadViewTask.doInBackground(CameraSearch.java:125) 
06-05 17:26:16.410: E/AndroidRuntime(19075): at com.bu.PropertySearchTypes.CameraSearch$LoadViewTask.doInBackground(CameraSearch.java:1) 
06-05 17:26:16.410: E/AndroidRuntime(19075): at android.os.AsyncTask$2.call(AsyncTask.java:185) 
06-05 17:26:16.410: E/AndroidRuntime(19075): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)

我打電話onSensorChanged）這個的AsyncTask（即用於執行該線程每個傳感器的值的變化。請幫我一把。這個例外令我非常沮喪。感謝您的幫助！

來源

2013-06-05 Mahe

你必須在新線程中啓動新的活套。例外包含此信息。爲正確使用檢查這個職位：What is the purpose of Looper and how to use it?

但真正的問題是你是否需要它呢？如果你想啓動一個Handler，你需要它。我不確定你是否需要它，但即使在你需要它的時候，你也需要專門的HandlerThread課程來照顧Looper。

來源

2013-06-05 12:14:19 allprog

了java.lang.RuntimeException：問題與Looper.prepare（）

回答

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