android - 我正在尝试从 TextView 中的 mysql 加载数据

Question

这是我的代码。请帮我找出错误。我在 ListView 中加载了所有回收，并且它工作正常，但是当我单击单个回收来显示详细信息时，它不起作用，它会向我显示布局，但不会在 TextView 中显示信息。

 public class EditReclamationActivity extends Activity {

                TextView txtName;

                TextView txtType;
                TextView txtDesc;
                String rid;

                Progress Dialog
                private ProgressDialog pDialog;                

                JSONParser jsonParser = new JSONParser();                

                private static final String url_reclamation_details = "http://192.168.1.67/android_connect/get_product_details.php";

                private static final String TAG_SUCCESS = "success";
                private static final String TAG_RECLAMATION = "reclamation";
                private static final String TAG_RID = "rid";
                private static final String TAG_NAME = "name";
                private static final String TAG_TYPE = "type";
                private static final String TAG_DESCRIPTION = "description";

                @Override
                public void onCreate(Bundle savedInstanceState) 
                {
                    super.onCreate(savedInstanceState);
                    setContentView(R.layout.edit_reclamation);

                    Intent i = getIntent();                  
                    rid = i.getStringExtra(TAG_RID);               

                    new GetReclamationDetails().execute();

                    txtName = (TextView) findViewById(R.id.name1);
                    txtType = (TextView) findViewById(R.id.type1);
                    txtDesc = (TextView) findViewById(R.id.description1);              
                }
        class GetReclamationDetails extends AsyncTask<String, String, String> {                   
                @Override
                protected void onPreExecute() {
                    super.onPreExecute();
                    pDialog = new ProgressDialog(EditReclamationActivity.this);
                    pDialog.setMessage("Loading reclamation details. Please wait...");
                    pDialog.setIndeterminate(false);
                    pDialog.setCancelable(true);
                    pDialog.show();            
                }         

                protected String doInBackground(String... params) {                       
                           try {

                               List<NameValuePair> pars = new ArrayList<NameValuePair>();
                               pars.add(new BasicNameValuePair("rid", rid));                              

                              final JSONObject json = jsonParser.makeHttpRequest(
                                      url_reclamation_details, "GET", pars);            

                               Log.d("Single Rec Details", json.toString());
                               final int success = json.getInt(TAG_SUCCESS);
                               runOnUiThread(new Runnable() {
                                   public void run() {                                      

                                       if (success == 1) {            
                                           try {

                                               JSONArray recObj = json.getJSONArray(TAG_RECLAMATION);         

                                               JSONObject reclamation = recObj.getJSONObject(0);    
                                               txtName.setText(reclamation.getString(TAG_NAME));                            txtType.setText(reclamation.getString(TAG_TYPE));                            txtDesc.setText(reclamation.getString(TAG_DESCRIPTION));            

                                           } catch (JSONException e) {

                                           }
                                       } else {

                                       }
                                   }
                               });
                           } catch (JSONException e) {
                                e.printStackTrace();
                            }                  

                    return null;
                }           

                protected void onPostExecute(String file_url) {         
                        pDialog.dismiss();
                }
            }   
        }

This is the message error, data are loaded from mysql but not in android:

Answer 1

看起来您在findViewsById()之前调用了new GetReclamationDetails().execute();。另外，请在 onPostExecute 或 onProgressUpdate 中更新您的 UI，并尝试调用您的 View ，例如:ActivityName.class.yourView.setText() 希望这会有所帮助。