خطا اتصال pdo به json در اندروید

Question

درود دوستان

برای صفحه ورود به اپلیکیشن منیخوام از بانک اطلاعاتی mysql و pdo استفاده کنم ولی جواب نمیده خطا: 

Error parsing data org.json.JSONException: Value Connected of type java.lang.String cannot be converted to JSONObject

 ورود : 

import java.util.ArrayList;
import java.util.List;

import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.StrictMode;
import android.preference.PreferenceManager;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class LoginOstad extends Activity implements OnClickListener{

    private EditText user, pass;
    private Button mSubmit, mRegister;
    List<NameValuePair> params = new ArrayList<NameValuePair>();
    JSONObject json;
    private ProgressDialog pDialog;
    JSONParser jsonParser = new JSONParser();
    "private static final String LOGIN_URL = "http://10.0.3.2/os/loginostad.php

    private static final String TAG_SUCCESS = "success";
    private static final String TAG_MESSAGE = "message";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.loginostad_layout);
        if (android.os.Build.VERSION.SDK_INT > 9) {
            StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
                    .permitAll().build();
            StrictMode.setThreadPolicy(policy);
        }
        user = (EditText)findViewById(R.id.editText1);
        pass = (EditText)findViewById(R.id.editText2);
        mSubmit = (Button)findViewById(R.id.button1);

        mSubmit.setOnClickListener(this);

    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.button1:
                new AttemptLogin().execute();
                break;
          

            default:
                break;
        }
    }

    class AttemptLogin extends AsyncTask<String, String, String> {

        boolean failure = false;

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            pDialog = new ProgressDialog(LoginOstad.this);
            pDialog.setMessage("Attempting login...");
            pDialog.setIndeterminate(false);
            pDialog.setCancelable(true);
            pDialog.show();
        }

        @Override
        protected String doInBackground(String... args) {
            int success;
            String username = user.getText().toString();
            String password = pass.getText().toString();
            try {
                params.add(new BasicNameValuePair("username", username));
                params.add(new BasicNameValuePair("password", password));

                Log.d("request!", "starting");
                
                Thread thread = new Thread() {
                    @Override
                    public void run() {
                        json = jsonParser.makeHttpRequest(
						        LOGIN_URL, "POST", params);
                    }
                };

                thread.start();
                Log.d("Login attempt", json.toString());
                success = json.getInt(TAG_SUCCESS);
                if (success == 1) {
                    Log.d("Login Successful!", json.toString());
                    SharedPreferences sp = PreferenceManager
                            .getDefaultSharedPreferences(LoginOstad.this);
                    SharedPreferences.Editor edit = sp.edit();
                    edit.putString("username",username);
                    edit.commit();

                    Intent i = new Intent(LoginOstad.this, MainProgram.class);
                    finish();
                    startActivity(i);
                    return json.getString(TAG_MESSAGE);
                }else{
                    Log.d("Login Failure!", json.getString(TAG_MESSAGE));
                    return json.getString(TAG_MESSAGE);

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

            return null;

        }
        
        protected void onPostExecute(String file_url) {
            pDialog.dismiss();
            if (file_url != null){
                Toast.makeText(LoginOstad.this, file_url, Toast.LENGTH_LONG).show();
            }

        }

    }

}