Android เชื่อมต่อฐานข้อมูล MySQL แล้วมีปัญหา รับค่าเป็น json

package com.example.csit.tourismjapan;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.StatusLine;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONException;
import org.json.JSONObject;

import android.os.Bundle;
import android.os.StrictMode;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Intent;
import android.util.Log;
import android.view.View;
import android.view.Menu;
import android.widget.Button;
import android.widget.TextView;



public class SubIntroActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_sub_intro);

        TextView txtRegionName = (TextView)findViewById(R.id.txt_region);
        TextView txtRegionDetail = (TextView)findViewById(R.id.txt_detail);

        // Input Intro Activity
        Bundle bundle = getIntent().getExtras();
        String regionId = bundle.getString("region_id");

        // Value send to php
        List<NameValuePair> params = new ArrayList<NameValuePair>();
        params.add(new BasicNameValuePair("region_id", regionId));

        // URL Load json data
        String url = "http://xxxxxx/xxxxxx/getRegion.php";

        String resultServer  = getHttpPost(url, params);
        String RegionID = "";
        String RegionName = "";
        String Detail = "";
        String Latitude = "";
        String Longitude = "";
        String RegionImage = "";


        JSONObject c;

        try {
            c = new JSONObject(resultServer);
            RegionID = c.getString("RegionID");
            RegionName = c.getString("RegionName");
            Detail = c.getString("Detail");
            Latitude = c.getString("Latitude");
            Longitude = c.getString("Longitude");
            RegionImage = c.getString("RegionImage");


            if(!RegionID.equals(""))
            {
                txtRegionName.setText(RegionName);
                txtRegionDetail.setText(Detail);
            }
            else
            {
                txtRegionName.setText("-");
                txtRegionDetail.setText("-");
            }

        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }



    }

    public String getHttpPost(String url,List<NameValuePair> params) {
        StringBuilder str = new StringBuilder();
        HttpClient client = new DefaultHttpClient();
        HttpPost httpPost = new HttpPost(url);

        try {
            httpPost.setEntity(new UrlEncodedFormEntity(params));
            HttpResponse response = client.execute(httpPost);
            StatusLine statusLine = response.getStatusLine();
            int statusCode = statusLine.getStatusCode();
            if (statusCode == 200) { // Status OK
                HttpEntity entity = response.getEntity();
                InputStream content = entity.getContent();
                BufferedReader reader = new BufferedReader(new InputStreamReader(content));
                String line;
                while ((line = reader.readLine()) != null) {
                    str.append(line);
                }
            } else {
                Log.e("Log", "Failed to download result..");
            }
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return str.toString();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

}

<?php
	include "config.php";

	$strRegionId = 1;
	
	//$strRegionId = $_POST["region_id"];
	$strSQL = "SELECT * FROM dimregion WHERE RegionID = '".$strRegionId."'  ";
	mysql_query("SET NAMES UTF8");
	$objQuery = mysql_query($strSQL);
	$obResult = mysql_fetch_array($objQuery);
	if($obResult)
	{
		$arr["RegionID"] = $obResult["RegionID"];
		$arr["RegionName"] = $obResult["RegionName"];
		$arr["Detail"] = $obResult["Detail"];
		$arr["Latitude"] = $obResult["Latitude"];
		$arr["Longitude"] = $obResult["Longitude"];
		$arr["RegionImage"] = $obResult["RegionImage"];
	}

	
	mysql_close($objConnect);

	
	echo json_encode($arr);
?>