Android สอบถามเรื่องสร้างฟอร์ม การค้นหาค่า json encode โดยรับค่าจาก 2 textedit ครับ

package masterung.app.app_bus;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.HashMap;
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.JSONArray;
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.app.AlertDialog;
import android.content.DialogInterface;
import android.util.Log;
import android.view.View;
import android.view.Menu;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.SimpleAdapter;

public class Road_Search  extends Activity{
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.search_road);
        // Permission StrictMode
        if (android.os.Build.VERSION.SDK_INT > 9) {
            StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
            StrictMode.setThreadPolicy(policy);
        }

        final Button btn1 = (Button) findViewById(R.id.button33);
        // Perform action on click
        btn1.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                SearchData();
            }
        });

    }

    public void SearchData()
    {
        // listView1
        final ListView lisView1 = (ListView)findViewById(R.id.listView1);

        // editText1
        final EditText inputText2 = (EditText)findViewById(R.id.editTextroad1);


        String url = "http://www.walkerengineering.co.th/bus/API_Road.php";

        // Paste Parameters
        List<NameValuePair> params = new ArrayList<NameValuePair>();
        params.add(new BasicNameValuePair("start", inputText2.getText().toString()));

        try {
            JSONArray data = new JSONArray(getJSONUrl(url,params));

            final ArrayList<HashMap<String, String>> MyArrList = new ArrayList<HashMap<String, String>>();
            HashMap<String, String> map;

            for(int i = 0; i < data.length(); i++){
                JSONObject c = data.getJSONObject(i);

                map = new HashMap<String, String>();
                map.put("Nobus", c.getString("Nobus"));
                map.put("Color", c.getString("Color"));
                map.put("Time", c.getString("Time"));
                map.put("Category", c.getString("Category"));
                map.put("Detail", c.getString("Detail"));
                MyArrList.add(map);

            }


            SimpleAdapter sAdap;
            sAdap = new SimpleAdapter(Road_Search.this, MyArrList, R.layout.search_bus_column,
                    new String[] {"Nobus", "Color", "Time", "Category", "Detail"}, new int[] {R.id.Nobus, R.id.Color, R.id.Time, R.id.Category, R.id.Detail});
            lisView1.setAdapter(sAdap);

            final AlertDialog.Builder viewDetail = new AlertDialog.Builder(this);
            // OnClick Item
            lisView1.setOnItemClickListener(new OnItemClickListener() {
                public void onItemClick(AdapterView<?> myAdapter, View myView,
                                        int position, long mylng) {

                    String strNobus = MyArrList.get(position).get("Nobus")
                            .toString();
                    String sColor = MyArrList.get(position).get("Color")
                            .toString();
                    String strTime = MyArrList.get(position).get("Time")
                            .toString();
                    String strCategory = MyArrList.get(position).get("Category")
                            .toString();
                    String strDetail = MyArrList.get(position).get("Detail")
                            .toString();

                    viewDetail.setIcon(android.R.drawable.btn_star_big_on);
                    viewDetail.setTitle("B Detail");
                    viewDetail.setMessage("เบอร์รถเมล์: " + strNobus + "\n"
                            + "สี : " + sColor + "\n"
                            + "เวลารถวิ่ง : " + strTime + "\n"
                            + "ประเภทรถ : " + strCategory + "\n"
                            + "รายละเอียด : " + strDetail);
                    viewDetail.setPositiveButton("OK",
                            new DialogInterface.OnClickListener() {
                                public void onClick(DialogInterface dialog,
                                                    int which) {
                                    // TODO Auto-generated method stub
                                    dialog.dismiss();
                                }
                            });
                    viewDetail.show();

                }
            });


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


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

        try {
            httpPost.setEntity(new UrlEncodedFormEntity(params,"UTF-8"));
            HttpResponse response = client.execute(httpPost);
            StatusLine statusLine = response.getStatusLine();
            int statusCode = statusLine.getStatusCode();
            if (statusCode == 200) { // Download 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 file..");
            }
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return str.toString();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

}

<?php
include ("connect.php");
	
	#ส่งค่ามาทั้งสองค่า แล้วรับค่าไว้
	$startx = $_REQUEST['start'];
	$endx= $_REQUEST['end'];

	 $strSQL = "SELECT a.*,b.Start, b.End,b.Price,b.Totalscore,b.Nobus FROM bus AS a LEFT JOIN road AS b ON a.Nobus = b.Nobus WHERE b.Start LIKE '%$startx%' AND  b.End LIKE '%$endx%' ";
	/* 
	$strSQL = "	 bus.Nobus, bus.Color,bus.Time,bus.Category,bus.Detail,road.Start, road.End,road.Price,road.Totalscore,road.Nobus FROM bus INNER JOIN road ON bus.Nobus=road.Nobus  WHERE 1 = Start LIKE '%".$strKeyword2."%'"; */

	$objQuery = mysql_query($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);
	}
	
	echo json_encode($resultArray);
?>