Android : ค่าไปไม่ถึง php อ่ะครับ รบกวนช่วยตรวจสอบให้ทีครับ

package com.royle.project_end;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import javax.net.ssl.HttpsURLConnection;

import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;



import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;

public class DialogSelectAmphurActivity extends Activity //implements OnItemClickListener
{
	
	private final String TAG = "internet";
	private ListView listview_province;
	
	

	ArrayList<HashMap<String, String>> myList = new ArrayList<HashMap<String, String>>();
	     HashMap<String, String> map;
	
	     String strUrl =("http://192.168.1.4/test_projectEnd/amphur.php");
	     ArrayList<NameValuePair> params = new ArrayList<NameValuePair>();
	     		
	     
	     
	    
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.layout_select_province_dialog);
		
		
		
		
	    
		//Log.d(TAG, sProvince_id);
	     
		new AsyncDownload().execute(strUrl);
	
	}
	
	public String getData(String strUrl, ArrayList<NameValuePair> params){	
		String jString;
		HashMap<String, String> map;
		
		String sProvince_id = getIntent().getStringExtra("provinceId");
		 params.add(new BasicNameValuePair("txtProvinceId",sProvince_id));
		 
		try {
			jString =  getJsonFromUrl(strUrl, params);
			
			
			//if(jString != null) {
				JSONArray jArray = new JSONArray(jString);
				Log.d(TAG, jArray +","+ params);
				
				for(int i =0; i< jArray.length(); i++)
				{
					JSONObject jObj = jArray.getJSONObject(i);
					String sAmphur_id = jObj.getString("AMPHUR_ID");
					String sAmphur_name = jObj.getString("AMPHUR_NAME");
					
					map = new HashMap<String, String>();
					map.put("amphur_id", sAmphur_id);
					map.put("amphur_name", sAmphur_name);
					myList.add(map);
					Log.d(TAG, sAmphur_id + sAmphur_name);
					
				}		
				
				
				
			//}
			
			
			
		} catch (IOException e) {
		e.printStackTrace();
		} catch (JSONException e) {
			e.printStackTrace();
		}
		return null;
			}
	
	private void showProvince(){
		
		
		ListView listView = (ListView) findViewById(R.id.listView_province1);
		ListAdapter adapter = new SimpleAdapter(this, myList, R.layout.row_layout_select_province, 
				new String[]{"amphur_id","amphur_name"}, new int[]{R.id.textView_province_id,R.id.textView_province_name});
		listView.setAdapter(adapter);
//		listView.setOnItemClickListener(this);
		
		
	}
	
	
	private String getJsonFromUrl(String strUrl,ArrayList<NameValuePair> params)throws IOException{
		URL url = new URL(strUrl);
		HttpPost httpPost = new HttpPost(strUrl);
		try {
			httpPost.setEntity(new UrlEncodedFormEntity(params));
			Log.d(TAG, params+"check");
			HttpURLConnection httpCon = (HttpURLConnection) url.openConnection();
			httpCon.setRequestMethod("GET");
			httpCon.setConnectTimeout(6*1000);
			int responseCode = httpCon.getResponseCode();
			Log.d(TAG, "The response is" + responseCode);
			
			if(responseCode == HttpsURLConnection.HTTP_OK){
				Log.d(TAG, "size" + httpCon.getContentLength());
				
				InputStream ins = httpCon.getInputStream();
				BufferedReader rd = new BufferedReader(new InputStreamReader(ins,"UTF-8"));
				String line;
				StringBuffer response = new StringBuffer();
				while((line = rd.readLine()) != null){
					response.append(line);
					response.append("\n");
					Log.d(TAG, line);
					
				}
				
				rd.close();
				return response.toString();
				
				
			}
				
				
		} catch (Exception ex) {
			Log.d(TAG,"Problem reading"+ ex.getLocalizedMessage());
		}
		return null;
	}
	
	private class AsyncDownload extends AsyncTask<String, Void, String>{
		ProgressDialog pd;
		@Override
		protected void onPreExecute(){
		pd = ProgressDialog.show(DialogSelectAmphurActivity.this, "Download", "Downloading....");
		}
		protected String doInBackground(String... Params){
			
			String data = getData(strUrl, params);
			
			return null;
			
		}
		
		protected void onPostExecute(String result){
			pd.dismiss();
			showProvince();
		}
	}
	
//	@Override
//	public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
//		String sProvinceId = myList.get(position).get("amphur_id").toString();
//		String sProvinceName = myList.get(position).get("amphur_name").toString();
//		
////		Intent intentProvince = new Intent(DialogSelectAmphurActivity.this,NewReGisTerActivity.class);
////		intentProvince.putExtra("provinceId", sProvinceId);
////		intentProvince.putExtra("provinceName", sProvinceName);
////		startActivity(intentProvince);
//	}
	}

<?php
	
	$provinceid = trim($_POST["txtProvinceId"]);
	
	require("libs/connection_to_abc.php");
	mysql_query("SET character_set_results=utf8");
	mysql_query("SET character_set_client=utf8");
	mysql_query("SET character_set_connection=utf8");
	
	
	
	$strSQL = "SELECT amphur.* FROM province,amphur
	WHERE province.PROVINCE_ID = amphur.PROVINCE_ID
	AND province.PROVINCE_ID ='$provinceid'  ";
	$objQuery = mysql_query($strSQL);
	$intNumField = mysql_num_fields($objQuery);
	$resultArray = array();
	while($obResult = mysql_fetch_array($objQuery))
	{
		$arrCol = array();
		for($i=0;$i<$intNumField;$i++)
		{
			$arrCol[mysql_field_name($objQuery,$i)] = $obResult[$i];
		}
		array_push($resultArray,$arrCol);
	}
	
	mysql_close($link);
	
	echo json_encode($resultArray);
?>