異步任務和敬酒 - Android

我開始爲Android Studio的應用程序執行同步。我的代碼是：異步任務和敬酒 - Android

private class Check_Loguin_Request extends AsyncTask<String,Void,String>{ 

    @Override 
    protected String doInBackground(String... strings) { 

     //Declaration of variables 
     String User = strings[0]; 
     String Pass = strings[1]; 
     DefaultHttpClient httpClient; 
     HttpPost Request = new HttpPost(url_Loguin); 
     HttpResponse Response; 
     HttpParams httpParameters = new BasicHttpParams(); 


     // Set the timeout in milliseconds until a connection is established. 
     // The default value is zero, that means the timeout is not used. 
     int timeoutConnection = 3000; 
     HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection); 
     // Set the default socket timeout (SO_TIMEOUT) 
     // in milliseconds which is the timeout for waiting for data. 
     int timeoutSocket = 5000; 
     HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket); 
     httpClient = new DefaultHttpClient(httpParameters); 


     List<NameValuePair> BodyRequest_Elements = new ArrayList<NameValuePair>(); 
     BodyRequest_Elements.add(new BasicNameValuePair("user_name", User)); 
     BodyRequest_Elements.add(new BasicNameValuePair("user_passwd", Pass)); 

     try { 
      HttpEntity entity = new UrlEncodedFormEntity(BodyRequest_Elements); 
      Request.setHeader(entity.getContentType()); 
      Request.setEntity(entity); 

      Response = httpClient.execute(Request); 

      HttpEntity entity2 = Response.getEntity(); 
      InputStream is = entity2.getContent(); 

      return Response.toString(); 
     } 
     catch (Exception ex){ 
      Log.getStackTraceString(ex); 
      return null; 
     } 
    } 

    protected void onPostExecute(String result){ 
     Toast.makeText(this, "Task Finalized: " + result, Toast.LENGTH_SHORT).show(); 
    } 
}

這個類是一個外部類我的主要活動（Sync_Class）（Loguin_Activity），當我把這個在敬酒IDE給我的錯誤。那我怎麼能從我的活動中發送上下文？提前致謝，並對我的英語感到抱歉！

PD1：如果您需要更多的代碼或信息，請給我建議！：d

來源

2014-11-20 Merlí Escarpenter Pérez

Check_Loguin_Request類是否在Loguin_Activity中？ – 2014-11-20 18:41:03

在你的任務類，創建一個構造函數，並給它你的背景是這樣的：

private class Check_Loguin_Request 
{ 
    Context cx; 
    public Check_Loguin_Request(Context cx) 
    { 
    this.cx=cx; 
    } 
}

然後在OnPostExecute使用CX

protected void onPostExecute(String result) 
{ 
    Toast.makeText(cx, "Task Finalized: " + result, Toast.LENGTH_SHORT).show(); 
}

使用這個類像這樣：

Check_Loguin_Request login=new Check_Loguin_Request(getBaseContext());

來源

2014-11-20 18:34:13 rejnev

將一個Context對象傳遞給AsyncTask的構造函數。

public class MyTask extends AsyncTask<?, ? ,?> { 
    private Context mContext; 

    public MyTask(Context context) { 
     mContext = context; 
    } 
}

，然後，當你正在構建你的AsyncTask：

MyTask task = new MyTask(this); 
task.execute(...);

您可以使用此mContext參考可以顯示吐司。

來源

2014-11-20 19:03:05 SubinM

Use Context context; 
context=this; 

Toast toast = Toast.makeText(context, "Your Text", +3); 
toast.show();

來源

2015-12-23 18:03:13

異步任務和敬酒 - Android

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