Android อยากสอบถามเกี่ยวกับการส่งค่า intent เพื่อสร้าง Google map

package com.example.crmtracking.testokhttp;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.StrictMode;
import android.support.v7.app.AppCompatActivity;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

import com.squareup.okhttp.FormEncodingBuilder;
import com.squareup.okhttp.OkHttpClient;
import com.squareup.okhttp.Request;
import com.squareup.okhttp.RequestBody;
import com.squareup.okhttp.Response;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.io.IOException;
import java.io.InputStream;

public class MainActivity extends AppCompatActivity {
    OkHttpClient okHttpClient = new OkHttpClient();
    private ImageView imageView;
    private TextView textView;
    private String nameString, latString, lngString;
    private String[] latStrings, lngStrings;
    private ListView listView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        imageView = (ImageView) findViewById(R.id.imageView);
        textView = (TextView) findViewById(R.id.textView);


        AsyncTaskGetData taskGetData = new AsyncTaskGetData();
        taskGetData.execute("cd298861-4cd3-1e93-2cec-5757f20ee3b5");

        AsyncTaskGetImage taskGetImage = new AsyncTaskGetImage();
        taskGetImage.execute();

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

    public class AsyncTaskGetData extends AsyncTask<String , Void, Void> {
        private String x;

        @Override
        protected void onPostExecute(Void aVoid) {


            try {

                JSONArray jsonArray = new JSONArray(x);

                final String[] nameStrings = new String[jsonArray.length()];
                latStrings = new String[jsonArray.length()];
                lngStrings = new String[jsonArray.length()];

                for (int i = 0; i < jsonArray.length(); i++) {

                    JSONObject jsonObject = jsonArray.getJSONObject(i);
                    nameStrings[i] = jsonObject.getString("name");
                    latStrings[i] = jsonObject.getString("jjwg_maps_lat");
                    lngStrings[i] = jsonObject.getString("jjwg_maps_lng");

                   

                }   // for

             listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                    @Override
                    public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                        
                        Intent intent = new Intent(MainActivity.this, MapActivity.class);

                        intent.putExtra("name", nameStrings[i]);
                        intent.putExtra("jjwg_maps_lat", latStrings[i]);
                        intent.putExtra("jjwg_maps_lng", lngStrings[i]);

                        startActivity(intent);

                    }   // onItem
                });

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



        }

        @Override
        protected Void doInBackground(String... params) {


            RequestBody body = new FormEncodingBuilder()
                    .add("sID", params[0])
                    .build();
            Request request = new Request.Builder()
                    .url("http://161.246.58.129/tablemap/table/jsonmap.php")
                    .post(body)
                    .build();
            Response response;
            try {
                response = okHttpClient.newCall(request).execute();
                String result = response.body().string();
                JSONObject object;
                try {
                    object = new JSONObject(result);
                    String id = object.getString("id");
                    String name = object.getString("name");
                    String description = object.getString("description");
                    String jjwg_maps_lat = object.getString("jjwg_maps_lat");
                    String jjwg_maps_lng = object.getString("jjwg_maps_lng");
                    x = "ID : " + id + "\n" + "ชื่อ : " + name + "\n" + "ที่อยู่ : " + description + "\n" + "Latitude : " + jjwg_maps_lat
                            + "\n" + "Longitude : " + jjwg_maps_lng;


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

                }
            } catch (IOException e) {
                e.printStackTrace();
            }
            return null;
        }
    }

    public class AsyncTaskGetImage extends AsyncTask<String, Void, Void> {
        private Bitmap bitmap;

        @Override
        protected void onPostExecute(Void aVoid) {
            imageView.setImageBitmap(bitmap);
        }

        @Override
        protected Void doInBackground(String... params) {
            Request request = new Request.Builder()
                    .url("https://pbs.twimg.com/profile_images/606585229034135553/2NqZJYQI.png")
                    .build();
            Response response;
            try {
                response = okHttpClient.newCall(request).execute();
                InputStream result = response.body().byteStream();
                bitmap = BitmapFactory.decodeStream(result);
            } catch (IOException e) {
                e.printStackTrace();
            }
            return null;

        }

    }
    

}

package com.example.crmtracking.testokhttp;

import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Color;
import android.location.LocationManager;
import android.os.Bundle;
import android.provider.Settings;
import android.support.v4.app.FragmentActivity;
import android.support.v7.app.AlertDialog;
import android.view.View;
import android.widget.TextView;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.location.Geofence;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.UiSettings;
import com.google.android.gms.maps.model.CircleOptions;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;

import java.util.ArrayList;

public class MapActivity extends FragmentActivity implements OnMapReadyCallback {

    private GoogleMap mMap;
    private String nameStrings, latString, lngString;
    ArrayList<Geofence> mGeofences;
    private GeofenceStore mGeofenceStore;

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

        final AlertDialog.Builder adb = new AlertDialog.Builder(this);
        LocationManager lm = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
        boolean isGPS_Enabled = false;
        boolean isNetwork_Enabled = false;
        try {
            isGPS_Enabled = lm.isProviderEnabled(LocationManager.GPS_PROVIDER);
        }catch (Exception ex) { }
        try {
            isNetwork_Enabled = lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
        }catch (Exception ex) { }

        if (!isGPS_Enabled && !isNetwork_Enabled) {
            adb.setTitle("Warning Location Services!!");
            adb.setMessage("Please Enable Location Services.");
            adb.setNegativeButton("Cancel", null);
            adb.setPositiveButton("Ok", new AlertDialog.OnClickListener() {
                public void onClick(DialogInterface dialog, int arg1) {
                    Intent myIntent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                    startActivity(myIntent);
                }
            });
            adb.show();
        }

        mMap = ((SupportMapFragment)getSupportFragmentManager()
                .findFragmentById(R.id.map)).getMap();


        //Receive From Intent
        nameStrings = getIntent().getStringExtra("name");
        latString = getIntent().getStringExtra("jjwg_maps_lat");
        lngString = getIntent().getStringExtra("jjwg_maps_lng");





        //Show View
        TextView textView = (TextView) findViewById(R.id.textView10);
        textView.setText(nameStrings);





    }   // Main Method

    public void clickBackPlate(View view) {
        finish();
    }



    @Override
    public void onMapReady(GoogleMap googleMap) {






    }   // onMap

    @Override
    protected void onStart() {

        super.onStart();
    }

    @Override
    protected void onStop() {

        super.onStop();


    }

    @Override
    protected void onResume() {
        super.onResume();
        if (GooglePlayServicesUtil.isGooglePlayServicesAvailable(this) == ConnectionResult.SUCCESS) {
            setUpMapIfNeeded();
        } else {
            GooglePlayServicesUtil.getErrorDialog(
                    GooglePlayServicesUtil.isGooglePlayServicesAvailable(this),
                    this, 0);
        }
    }


    private void setUpMapIfNeeded() {

        if (mMap == null) {

            mMap = ((SupportMapFragment) getSupportFragmentManager()
                    .findFragmentById(R.id.map)).getMap();


            if (mMap != null) {
                setUpMap();
            }
        }
    }


    private void setUpMap() {

        UiSettings uis = mMap.getUiSettings();
        mMap.setMyLocationEnabled(true);
        mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(13.729468, 100.779361), 16));
        mMap.setIndoorEnabled(false);
        uis.setCompassEnabled(true);

    }

}