从 localhost 服务器渲染文本

Question

• 当我从 localhost 获取文本时，有时它会显示在 textview 中，有时则不显示。
• 我不知道该怎么做，但我检查了我所有的本地主机服务器，数据库在邮递员中表它工作正常。

• 但是，当我与 android 集成时，有时文本不会显示

  public class BackGroundTask extends AsyncTask<RequestPackage, String, String> {
  @Override
  protected void onPreExecute() {
      super.onPreExecute();
  
  
  }
  
  @Override
  protected String doInBackground(RequestPackage... params) {
      return RequestHttpURLConnection.getData(params[0]);
  }
  
  @Override
  protected void onProgressUpdate(String... values) {
      super.onProgressUpdate(values);
  }
  
  @Override
  protected void onPostExecute(String result) {
      JSONObject jsonObject = null;
  
  
          switch (gridItemId) {
              case 0:
                  break;
              case 1: {
                  Chairmen_textView.setText(result);
              }
              break;
              case 2: {
                  Principal_textView.setText(result);
                 }  break;
  
              case 3:   try  {
  
  
                  JSONArray jsonArray = new JSONArray(result);
                  for (int i = 0; i < jsonArray.length(); i++) {
                      JSONObject jsonObject1 = jsonArray.getJSONObject(i);
                      String trust_title = jsonObject1.getString("title");
                      String trust_content = jsonObject1.getString("trust_content");
                      String college_details = jsonObject1.getString("college_details");
                      Trust_title_textView.setText(trust_title);
                      Trust_content_textView.setText(trust_content);
                      College_details_textView.setText(college_details);
                  }
                 } catch (JSONException e) {
                  e.printStackTrace();
              } break;
  
  
              case 4: try {
  
                  JSONArray jsonArray = new JSONArray(result);
                  for (int i = 0; i < jsonArray.length(); i++) {
                      JSONObject jsonObject1 = jsonArray.getJSONObject(i);
                      String management = jsonObject1.getString("title");
                      String headline = jsonObject1.getString("headline");
                      String powers = jsonObject1.getString("powers");
                      String name = jsonObject1.getString("name");
                      String member_title = jsonObject1.getString("member_title");
                      String member_content = jsonObject1.getString("member_content");
                      String end_line = jsonObject1.getString("end_line");
  
                      Management_textView.setText(management);
                      Headline_textView.setText(headline);
                      Power_textView.setText(powers);
                      Name_textView.setText(name);
                      Member_title_textView.setText(member_title);
                      Member_content_textView.setText(member_content);
                      End_line_textView.setText(end_line);
                  }
                } catch (JSONException e) {
                  e.printStackTrace();
              }   break;
  
              case 5: try {
  
                  JSONArray jsonArray = new JSONArray(result);
                  for (int i = 0; i < jsonArray.length(); i++) {
                      JSONObject jsonObject1 = jsonArray.getJSONObject(i);
                      String quality_title = jsonObject1.getString("title");
                      String subtitle_vision = jsonObject1.getString("subtitle_vision");
                      String subtitle_vision_content = jsonObject1.getString("vision_content");
                      String subtitle_mission = jsonObject1.getString("subtitle_mission");
                      String subtitle_mission_content = jsonObject1.getString("mission_content");
                      String subtitle_quality_policy = jsonObject1.getString("subtitle_quality_policy");
                      String subtitle_quality_policy_content = jsonObject1.getString("quality_policy_content");
  
  
                      Quality_Title_textView.setText(quality_title);
                      Subtitle_vision_textView.setText(subtitle_vision);
                      Subtitle_vision_content_textView.setText(subtitle_vision_content);
                      Subtitle_mission_textView.setText(subtitle_mission);
                      Subtitle_mission_content_textView.setText(subtitle_mission_content);
                      Subtitle_quality_policy_textView.setText(subtitle_quality_policy);
                      Subtitle_quality_policy_content_textView.setText(subtitle_quality_policy_content);
  
  
                  }
  
  
            } catch (JSONException e) {
                  e.printStackTrace();
              }      break;
              case 6:try {
  
                  JSONArray jsonArray = new JSONArray(result);
                  for (int i = 0; i < jsonArray.length(); i++) {
                      JSONObject jsonObject1 = jsonArray.getJSONObject(i);
                      String location_title = jsonObject1.getString("title");
                      String location_content = jsonObject1.getString("location_content");
                      Location_title.setText(location_title);
                      Location_content.setText(location_content);
  
  
                  }
  
                   }catch (JSONException e) {
                  e.printStackTrace();
              } break;
          }
      }
  
  
     }
  

Answer 1

首先，我将 try catch 块包裹在开关周围以避免代码重复。其次，您只捕获 jsonexception，尝试用更一般的异常替换此异常。也许这有帮助