onPostExecute變空Json

Question

我想使用一個名爲BackgroundTask（它擴展了AsyncTask）的新類，將數據從RegisterActivity傳遞到mySqlDatabase。在調用onPreExecute(),doInBackground()和onPostExecute()後，onPostExecute正在爲我的屬性JSON獲取null值。

BackGroundTask

public class BackgroundTask extends AsyncTask<String,Void,String> { 
String registerUrl = "http://127.0.0.1/gestion/register.php"; 
Context ctx ; 
Activity activity ; 
ProgressDialog progressDialog ; 
AlertDialog.Builder builder ; 
public BackgroundTask(Context ctx) { 
    this.ctx = ctx; 
    activity = (Activity)ctx; 
} 

@Override 
protected void onPreExecute() { 
    builder = new AlertDialog.Builder(activity); 
    progressDialog = new ProgressDialog(ctx); 
    progressDialog.setTitle("Please Wait "); 
    progressDialog.setMessage("Connecting Server ... "); 
    progressDialog.setIndeterminate(true); 
    progressDialog.setCancelable(false); 
    progressDialog.show(); 

} 

@Override 
protected String doInBackground(String... params) { 
    String method = params[0]; 
    if (method.equals("register")){ 
     try { 
      URL url = new URL(registerUrl); 
      HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection(); 
      httpURLConnection.setRequestMethod("POST"); 
      httpURLConnection.setDoOutput(true); 
      httpURLConnection.setDoInput(true); 
      OutputStream outputStream = httpURLConnection.getOutputStream(); 
      BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream,"UTF-8")); 
      String name = params[1]; 
      String email = params[2]; 
      String password = params[3]; 
      String data = URLEncoder.encode("name","UTF-8")+"="+URLEncoder.encode(name,"UTF-8")+"&"+ 
          URLEncoder.encode("email","UTF-8")+"="+URLEncoder.encode(email,"UTF-8")+"&"+ 
          URLEncoder.encode("password","UTF-8")+"="+URLEncoder.encode(password,"UTF-8"); 
      bufferedWriter.write(data); 
      bufferedWriter.flush(); 
      bufferedWriter.close(); 
      outputStream.close(); 
      InputStream inputStream = httpURLConnection.getInputStream(); 
      BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream)); 
      StringBuilder stringBuilder = new StringBuilder(); 
      String line = "" ; 
      while ((line=bufferedReader.readLine())!=null){ 
       stringBuilder.append(line+"\n"); 
      } 
      httpURLConnection.disconnect(); 
      Thread.sleep(5000); 
      return stringBuilder.toString(); 
     } catch (MalformedURLException e) { 
      e.printStackTrace(); 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } catch (InterruptedException e) { 
      e.printStackTrace(); 
     } 
    } 
    return null; 
} 

@Override 
protected void onProgressUpdate(Void... values) { 
    super.onProgressUpdate(values); 
} 

@Override 
protected void onPostExecute(String json) { 
    if(json == null){ 
     try { 
      progressDialog.dismiss(); 
      showDialog("Registration Failed ", "Json Null" , "reg_false"); 
      JSONObject jsonObject = new JSONObject(json); 
      JSONArray jsonArray =jsonObject.getJSONArray("server_response"); 
      JSONObject jo = jsonArray.getJSONObject(0); 
      String code = jo.getString("code"); 
      String message = jo.getString("message"); 
      if(code.equals("reg_true")){ 
       showDialog("Registration sucess ", message , code); 
      }else if(code.equals("reg_false")){ 
       showDialog("Registration Failed ",message,code); 
      } 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
    }else{ 
     showDialog("Registration Failed ", "Json not Null" , "reg_false"); 
    } 
} 

public void showDialog(String title , String message, String code){ 
    builder.setTitle(title); 
    if(code.equals("reg_true")|| code.equals("reg_false")){ 
     builder.setMessage(message); 
     builder.setPositiveButton("OK", new DialogInterface.OnClickListener(){ 

      @Override 
      public void onClick(DialogInterface dialog, int which) { 
       dialog.dismiss(); 
       activity.finish(); 
      } 
     }); 
     AlertDialog alertDialog = builder.create(); 
     alertDialog.show(); 

    } 
} 

RegisterActivity

Answer 1

把10.0.2.2在您的網址，如果你使用的是默認的Android模擬器進行測試，或者10.0.3.2如果您正在使用基因運動模擬器。 127.0.0.1是您的環回或本地主機地址。但你需要把你的模擬器或PC的地址。