HttpResponse/httpClient.execute錯誤

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我是新來的Android和新的Stackoverflow！HttpResponse/httpClient.execute錯誤

我只是創建虛擬應用程序來了解http連接。在編譯我在此行

的HttpResponse getbackdata = http_client.execute（url_data）遇到一個錯誤;

我甚至在stackoverflow中搜索，但大多數人出來建議使用異常處理來捕獲UnknownHostException。我做到了。我不知道我在哪裏搞亂了代碼。這可能是一個小錯誤，因爲我是初學者，我將從中學習。在此先感謝。

protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main);   

     try { 
      HttpClient http_client=new DefaultHttpClient(); 
      URI url=new URI("http://www.mysite.com"); 
      HttpGet url_data=new HttpGet(url); 

      HttpResponse getbackdata= http_client.execute(url_data); 

      InputStreamReader in =new InputStreamReader(getbackdata.getEntity().getContent()); 
      BufferedReader br = new BufferedReader(in); 

      StringBuffer sb=new StringBuffer(""); 
      String info=""; 
      String nl=System.getProperty("line.separator"); 

      while((info=br.readLine())!=null){ 
       sb.append(info.toString()+nl); 
      } 
      br.close(); 
      TextView output=(TextView) findViewById(R.id.display_output); 
      output.setText(sb.toString()); 
     } catch (UnknownHostException e) { 
      // TODO Auto-generated catch block 
      Log.d("ARR_ERROR","UnknownHostException : "+e); 
     } 
     catch (ClientProtocolException e) { 
      // TODO Auto-generated catch block 
      Log.d("ARR_ERROR","ClientProtocolException : "+e); 

     } catch (IOException e) { 
      // TODO Auto-generated catch block 
      Log.d("ARR_ERROR","IOException : "+e); 
     } 
     catch (URISyntaxException e) { 
     // TODO Auto-generated catch block 
     Log.d("ARR_ERROR","URISyntaxException : "+e); 
    } 


}

來源

2013-11-21 Rafique Mohammed

使用異步類。發佈logcat。 –

我想知道爲什麼嚇倒人們downvote我的問題！ –