สอบถามหน่อยคะ สร้างแอพแอนดรอยนำทางไปยังพิกัดที่ต้องการ โดยดึงพิกัดมาจาก Appserv

package app.meter.com.meter;

import android.os.Bundle;
import android.os.StrictMode;
import android.support.v4.app.FragmentActivity;
import android.util.Log;

import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

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


public class MapsActivity extends FragmentActivity {

    // Google Map
    private GoogleMap googleMap;

    // Latitude & Longitude
    private Double LAT = 0.00;
    private Double LONG = 0.00;

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_maps);

        //*** Permission StrictMode
        if (android.os.Build.VERSION.SDK_INT > 9) {
            StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
            StrictMode.setThreadPolicy(policy);
        }

        ArrayList<HashMap<String, String>> location = null;
        String url = "http://localhost/getLatLon.php";
        try {

            JSONArray data = new JSONArray(getHttpGet(url));

            location = 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("FID", c.getString("FID"));
                map.put("LAT", c.getString("LAT"));
                map.put("LONG", c.getString("LONG"));
                map.put("PEANO", c.getString("PEANO"));
                location.add(map);

            }

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


        // *** Display Google Map
        googleMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.googleMap)).getMap();

        // *** Focus & Zoom
        LAT = Double.parseDouble(location.get(0).get("LAT").toString());
        LONG = Double.parseDouble(location.get(0).get("LONG").toString());
        LatLng coordinate = new LatLng(LAT, LONG);
        googleMap.setMapType(com.google.android.gms.maps.GoogleMap.MAP_TYPE_HYBRID);
        googleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(coordinate, 17));

        // *** Marker (Loop)
        for (int i = 0; i < location.size(); i++) {
            LAT = Double.parseDouble(location.get(i).get("LAT").toString());
            LONG = Double.parseDouble(location.get(i).get("LONG").toString());
            String name = location.get(i).get("PEANO").toString();
            MarkerOptions marker = new MarkerOptions().position(new LatLng(LAT, LONG)).title(name);
            googleMap.addMarker(marker);
        }

    }

    public static String getHttpGet(String url) {
        StringBuilder str = new StringBuilder();
        HttpClient client = new DefaultHttpClient();
        HttpGet httpGet = new HttpGet(url);
        try {
            HttpResponse response = client.execute(httpGet);
            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 result..");
            }
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return str.toString();
    }

}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MapsActivity" >



    <fragment xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/googleMap"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:name="com.google.android.gms.maps.SupportMapFragment"/>

</RelativeLayout>