AsyncTask onPostExecute空指針異常

我已經創建了兩個AsyncTask，但是當我傳遞第一個asyn任務的輸出是第二個asyn任務的輸入時，它是空的這裏是我的代碼。AsyncTask onPostExecute空指針異常

String input=EnterYourSearch.getText().toString(); 
Geopoint point_to_be_send; 
    get_location.execute(input);  
    getplaces.execute(point_to_be_send); 
     public class Getlocation extends AsyncTask<String, String, Geopoint> 
     { 
      @Override 
      protected Geopoint doInBackground(String... params) { 
      jsonobject=JsonRequest.getLocationInfo(params[0]); 
      point=JsonRequest.getLatLong(jsonobject);  
      return point;  
      } 
      @Override 
      protected void onPostExecute(Geopoint point) { 
      if(point.lat !=0) 
      { 
       //check=false; 
       point_to_be_send=point; 
      } 
      } 
     } 
    public class Getplaces extends AsyncTask<Geopoint, String, Boolean> 
     { 



      @Override 
      protected Boolean doInBackground(Geopoint... params) { 
       // TODO Auto-generated method stub 
       googleplaces=new Googleplaces(); 



         try { 
         googleplaces.search(params[0].lat, params[0].lon, 1000, null); 
        } catch (Exception e) { 
         // TODO Auto-generated catch block 
         Log.d("Error", e.toString()); 
         e.printStackTrace(); 
        } 
        return true; 

        }

這是的GeoPoint類

public class Geopoint { 

    public double lat; 
    public double lon; 
    public Geopoint(double i, double j) { 
     // TODO Auto-generated constructor stub 
     lat=i; 
     lon=j; 
    } 
}

來源

2013-01-08 user1115684

發佈您的堆棧跟蹤。並向我們展示如何調用'AsyncTask'。 –

「點」在哪裏申報？宣告「point_to_be_send」在哪裏？哪一行拋出異常？ –

我已更新我的問題，對於由此造成的不便深表歉意 – user1115684

你初始化失敗point_to_be_send
添加這樣的事情

Geopoint point_to_be_send = new Geopoint(myDoubleI, myDoubleJ);

point_to_be_send is null這就是爲什麼你所得到的例外。

來源

2013-01-08 01:30:14

AsyncTask onPostExecute空指針異常

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