在運行Android的方法中的異常一個MainTask的

了java.lang.RuntimeException：無法內螺紋創建處理程序尚未調用Looper.prepare（）在運行Android的方法中的異常一個MainTask的

我有一個服務調用的方法run我MainTask每15秒（用於測試的原因）timer.scheduleAtFixedRate(new MainTask(), 0, 15000);（稱爲onStartCommand

run方法中的代碼看起來像這樣：

public void run() { 
     Log.v("MainTask", "run() Called"); 
     GpsHelper gpsHelper = new GpsHelper(getApplicationContext(), this); // This is causing the error - commented out => no error 
     // Doing some independent webrequests here! 
     }

的GpsHelper類看起來像這樣（它有一些if語句 - 因爲它也被用來在Mainactivity外服： mLocationManager.removeUpdates(this);

：

public GpsHelper(Context context, LocationReceiver locationReceiver) { 
    this.context = context; 
    this.locationReceiver = locationReceiver; 
    mLocationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE); 
    if (locationReceiver instanceof Runnable) { 
     isRunnable = true; 
    } 
    run(); 
} 

/** 
* Getting the Location, handling permission, requesting location updates if time is greater than 2 minutes 
*/ 
public void getLocation() { 
    if (ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED && !isRunnable) { 
     StaticHelpers.askForFineLocationPermission(context); 
    } else { 
     if (isRunnable && ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) { 
      Log.v("GpsHelper", "Runnable can't get position - check permissions!"); 
     } else { 
      Location location = mLocationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER); 
      // If time not greater than 2 minutes 
      // TODO: Move to resources 
      if (location != null && location.getTime() > Calendar.getInstance().getTimeInMillis() - 2 * 60 * 1000) { 
       Log.v("GpsHelper", "Using existing location"); 
       locationReceiver.onLocationAvailable(location); 
      } else { 
       Log.v("GpsHelper", "No Position Available => Requesting Location Updates"); 
       mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this); 
       if (!isRunnable && !mLocationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) { 
        showSettingsDialog(); 
       } 
      } 
     } 

    }

得到這個方法被調用的位置後

何時發生此錯誤？ 第四次運行叫做

可能的答案需要包含什麼？ 答案應該可以幫助我解決這個錯誤而不會改變任何邏輯行爲，並且不應該在UI線程上運行！

來源

2016-09-26 Matthias Herrmann

Log.v（「MainTask」，「run（）Called」）; GpsHelper gpsHelper = new GpsHelper（getApplicationContext（），this）; 在處理程序中添加此代碼或runOnUiThread（） – Kamal

getActivity().runOnUiThread(new Runnable() { 
     @Override 
     public void run() { 
      Log.v("MainTask", "run() Called"); 
      GpsHelper gpsHelper = new GpsHelper(getApplicationContext(), this); // This is causing the error - commented out => no error 
     } 
    });

來源

2016-09-26 13:20:45 Kamal

我不想在ui線程上運行此代碼，並且我無法調用'getActivity' –

您無法從其他線程更新UI。創建一個處理程序或runOnUiThread。 – Kamal

getActivity（）在片段中可用。您可以將getActivity替換爲活動的上下文。 – Kamal

在運行Android的方法中的異常一個MainTask的

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