Android Google Map : Search and Find Location

package com.myapp;

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 android.location.Address;
import android.location.Geocoder;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.Toast;

import java.io.IOException;
import java.util.List;

import com.google.android.gms.maps.CameraUpdateFactory;

public class MainActivity extends FragmentActivity {

	// Google Map
	private GoogleMap googleMap;
	
	// Latitude & Longitude
	private Double Latitude  = 13.844205;
	private Double Longitude  = 100.598856;
	
	// RadioButton
	RadioButton rdoNormal, rdoHybrid, rdoSatellite, rdoTerrain;
	
	LatLng latLng;
	MarkerOptions markerOptions;

	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);	
		
            //*** Display Google Map
            googleMap = ((SupportMapFragment)getSupportFragmentManager()
                    .findFragmentById(R.id.googleMap)).getMap(); 
            
            LatLng coordinate = new LatLng(Latitude, Longitude);
            
            //*** Focus & Zoom
            googleMap.setMapType(com.google.android.gms.maps.GoogleMap.MAP_TYPE_HYBRID);
            googleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(coordinate, 17));
            
            //*** Zoom Control
            googleMap.getUiSettings().setRotateGesturesEnabled(true);  
            
            //*** Keyword
            final EditText txtKeyword = (EditText) findViewById(R.id.txtKeyword); 
   
            //*** Button Search
            Button btnSearch = (Button) findViewById(R.id.btnSearch);
            btnSearch.setOnClickListener(new View.OnClickListener() {
                public void onClick(View v) {
                	new GeocoderTask().execute(txtKeyword.getText().toString());
                }
            });
            
	}
	
    //*** An AsyncTask Background Process
    private class GeocoderTask extends AsyncTask<String, Void, List<Address>>{
 
        @Override
        protected List<Address> doInBackground(String... locationName) {
            Geocoder geocoder = new Geocoder(getBaseContext());
            List<Address> addresses = null;
 
            try {
                // Getting a maximum of 3 Address that matches the input text
                addresses = geocoder.getFromLocationName(locationName[0], 3);
            } catch (IOException e) {
                e.printStackTrace();
            }
            return addresses;
        }
 
        @Override
        protected void onPostExecute(List<Address> addresses) {
 
            if(addresses==null || addresses.size()==0){
                Toast.makeText(getBaseContext(), "No Location found", Toast.LENGTH_SHORT).show();
            }
 
            // Clears all the existing markers on the map
            googleMap.clear();
 
            // Adding Markers on Google Map for each matching address
            for(int i=0;i<addresses.size();i++){
 
                Address address = (Address) addresses.get(i);
 
                // Creating an instance of GeoPoint, to display in Google Map
                latLng = new LatLng(address.getLatitude(), address.getLongitude());
 
                String addressText = String.format("%s, %s",
                address.getMaxAddressLineIndex() > 0 ? address.getAddressLine(0) : "",
                address.getCountryName());
 
                markerOptions = new MarkerOptions();
                markerOptions.position(latLng);
                markerOptions.title(addressText);
 
                googleMap.addMarker(markerOptions);
 
                // Locate the first location
                if(i==0)
                {
                    googleMap.animateCamera(CameraUpdateFactory.newLatLng(latLng));
                }
            }
        }
    }

}