http连接错误android.os.networkonmainthreadexception

Question

我为android写了一个应用程序，我有一个问题。它适用于手机，但不适用于平板电脑。 我有错误：http连接android.os.networkonmainthreadexception错误。这是我的代码：

public class AktualizacjaActivity { public static final String KEY_121 =“http：//xxx.php”;

public String getServerData(String returnString,Context context) { 
    DatabaseAdapter db1 = new DatabaseAdapter(context); 
    db1.open(); 
    String question=""; 
    try 
    { 

     Cursor c = db1.makeCursor(DatabaseAdapter.STRUCT, new String[] {DatabaseAdapter.ID},DatabaseAdapter.KODE_ID+"='"+returnString+"'",null); 
     c.moveToFirst(); 
     question+="NOT IN('"; 
     while(!c.isLast()) 
     { 
     question+=c.getString(c.getColumnIndex(DatabaseAdapter.ID))+"','"; 
     c.moveToNext(); 
     } 
     question+=c.getString(c.getColumnIndex(DatabaseAdapter.ID))+"')"; 

    } 
    catch(Exception e) 
    { 

    } 

    db1.close(); 
    if(question.equalsIgnoreCase("NOT IN('")) question=""; 


    InputStream is = null; 

    String result = ""; 
    //the year data to send, warunek rok większy od 1980 
    ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(); 
    nameValuePairs.add(new BasicNameValuePair("code_id",returnString)); 
    nameValuePairs.add(new BasicNameValuePair("no", question)); 

    //http post 
    try{ 
      HttpClient httpclient = new DefaultHttpClient(); 
      HttpPost httppost = new HttpPost(KEY_121); 
      httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs)); 
      HttpResponse response = httpclient.execute(httppost); 
      HttpEntity entity = response.getEntity(); 
      is = entity.getContent(); 


    }catch(Exception e){ 
      Log.e("log_tag", "Error in http connection "+e.toString()); 
    } 

    //convert response to string 
    try{ 
      BufferedReader reader = new BufferedReader(new InputStreamReader(is,"ISO-8859-2"),8); 
      StringBuilder sb = new StringBuilder(); 
      String line = null; 
      while ((line = reader.readLine()) != null) { 
        sb.append(line + "\n"); 
      } 
      is.close(); 
      result=sb.toString(); 

    }catch(Exception e){ 
      Log.e("log_tag", "Error converting result "+e.toString()); 
    } 
    //parse json data 
    DatabaseAdapter db = new DatabaseAdapter(context); 
    db.open(); 
    try{ 


      JSONArray jArray = new JSONArray(result); 

      for(int i=0;i<jArray.length();i++){ 
        JSONObject json_data = jArray.getJSONObject(i); 

        db.addItmem("INSERT INTO my_kodeks_struktura VALUES(" 
        +json_data.getInt("id")+"," 
        +json_data.getInt("code_id")+","+ 
        json_data.getInt("position_art")+",'"+ 
        json_data.getString("position_art_a")+"',"+ 
        json_data.getInt("level")+",'"+ 
        json_data.getString("name")+"');"); 



      } 


    }catch(JSONException e){ 
      Log.e("log_tag", "Error parsing data "+e.toString()); 
    } 
    db.close(); 
    return "Upd"; 

}  



} 

Answer 1

这就像例外说的那样：你不能在ui线程上进行http调用。至少不在较新的操作系统上。

考虑使用AsyncTask进行此类调用。