Android Google Map V2 | Android Draw Polygon

Hello Friends,
                               This is my small tutorial on google map v2. This blogs covers
following point:

1. Start Drawing on Google Map | Draw geometry on Google map
2. Clear drawing | Clear polygon
3. Close Polygon
4. Save Geometry

Screen 1:  Click on start drawing button and starting drawing geometry or polygon
                 or polyline.

 Screen2: Click on close polygon button which close the polygon.

Here is my code:

1. MainActivity.java  

/*
 * Copyright (C) 2014 Mukesh Y authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package info.androiddeveloper.googlemapsv2;

import java.util.ArrayList;

import org.osmdroid.api.IGeoPoint;
import org.osmdroid.util.GeoPoint;

import android.annotation.SuppressLint;
import android.app.ActionBar;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.graphics.Color;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.Window;
import android.widget.Toast;

import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.GoogleMap.OnMapClickListener;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.android.gms.maps.model.Polygon;
import com.google.android.gms.maps.model.PolygonOptions;
import com.google.android.gms.maps.model.PolylineOptions;

/**
 * @author Mukesh Y
 */
public class MainActivity extends Activity implements OnMapClickListener {

 // Google Map
 private GoogleMap googleMap;
 ArrayList latLang = new ArrayList();
 ArrayList listPoints = new ArrayList();
 boolean isGeometryClosed = false;
 Polygon polygon;
 Context context = MainActivity.this;
 boolean isStartGeometry = false;

 @SuppressLint("NewApi")
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  try {
   initilizeMap();
   ActionBar actionBar = this.getActionBar();
   actionBar.setDisplayHomeAsUpEnabled(true);
   actionBar.setDisplayShowCustomEnabled(true);
   actionBar.setDisplayShowTitleEnabled(true);
   actionBar.setIcon(R.drawable.ic_launcher);
  } catch (Exception e) {
  }
 }
 
 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
  MenuInflater menuInflater = getMenuInflater();
  menuInflater.inflate(R.menu.map_menu, menu);
  return super.onCreateOptionsMenu(menu);
 }

 @Override
 public boolean onOptionsItemSelected(MenuItem item) {

  switch (item.getItemId()) {
  case R.id.action_normal:
   googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
   return true;

  case R.id.action_hybrid:
   googleMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
   return true;

  case R.id.action_satellite:
   googleMap.setMapType(GoogleMap.MAP_TYPE_SATELLITE);
   return true;
  
  default:
   return super.onOptionsItemSelected(item);
  }
 }

 /**
  * function to load map. If map is not created it will create it for you
  * */
 private void initilizeMap() {
  if (googleMap == null) {

   googleMap = ((MapFragment) getFragmentManager().findFragmentById(
     R.id.map)).getMap();

   // check if map is created successfully or not
   if (googleMap == null) {
    Toast.makeText(this, "Sorry! unable to create maps",
      Toast.LENGTH_SHORT).show();
    return;
   }

   googleMap.getUiSettings().setMyLocationButtonEnabled(true);
   // set my location
   googleMap.setMyLocationEnabled(true);
   googleMap.getUiSettings().setCompassEnabled(false);
   googleMap.getUiSettings().setRotateGesturesEnabled(false);
   // set zooming controll
   googleMap.getUiSettings().setZoomControlsEnabled(true);
   googleMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
   googleMap.setOnMapClickListener(this);
  }

 }

 public void Draw_Map() {
  PolygonOptions rectOptions = new PolygonOptions();
  rectOptions.addAll(latLang);
  rectOptions.strokeColor(Color.BLUE);
  rectOptions.fillColor(Color.CYAN);
  rectOptions.strokeWidth(7);
  polygon = googleMap.addPolygon(rectOptions);
 }

 @Override
 protected void onResume() {
  super.onResume();

 }

 /**
  * Close the Polygon / join last point to first point
  * 
  * @param view
  */
 public void closePolygon(View view) {
  if (latLang.size() > 0) {
   Draw_Map();
   isGeometryClosed = true;
   isStartGeometry = false;
  }
 }

 /**
  * Close the Polygon / join last point to first point
  * 
  * @param view
  */
 public void startDrawing(View view) {
  isStartGeometry = true;
 }

 @Override
 public void onMapClick(LatLng latlan) {
  if (!isGeometryClosed && isStartGeometry) {
   latLang.add(latlan);
   GeoPoint point = new GeoPoint(latlan.latitude, latlan.longitude);
   listPoints.add((IGeoPoint) point);
   MarkerOptions marker = new MarkerOptions().position(latlan);
   googleMap.addMarker(marker);
   if (latLang.size() > 1) {
    PolylineOptions polyLine = new PolylineOptions().color(
      Color.BLUE).width((float) 7.0);
    polyLine.add(latlan);
    LatLng previousPoint = latLang.get(latLang.size() - 2);
    polyLine.add(previousPoint);
    googleMap.addPolyline(polyLine);
   }
  }
 }

 /**
  * Clear the all draw lines
  * 
  * @param view
  *            Current view of activity
  */
 public void clearCanvas(View view) {

  try {
   AlertDialog.Builder alertdalogBuilder = new AlertDialog.Builder(
     context);

   alertdalogBuilder.setTitle("Clear");
   alertdalogBuilder
     .setMessage(
       "Do you really want to clear the geometry? This action can't be undone!")
     .setCancelable(false)
     .setPositiveButton("Yes",
       new DialogInterface.OnClickListener() {

        @Override
        public void onClick(DialogInterface dialog,
          int id) {
         // polygon.remove();
         googleMap.clear();
         latLang = new ArrayList();
         listPoints = new ArrayList();
         isGeometryClosed = false;
        }
       })
     .setNegativeButton("No",
       new DialogInterface.OnClickListener() {

        @Override
        public void onClick(DialogInterface dialog,
          int which) {
         dialog.cancel();
        }
       });

   // Create Alert Dialog
   AlertDialog alertdialog = alertdalogBuilder.create();
   // show the alert dialog
   alertdialog.show();

  } catch (Exception e) {
  }

 }

 /**
  * Method for Save Property
  * 
  * @param view
  */
 public void savePolygon(View view) {
  try {
   if (isGeometryClosed) {
    AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
      context);
    alertDialogBuilder.setTitle("Save");
    alertDialogBuilder
      .setMessage(
        "Do you really want to save? This action can't be undone!")
      .setCancelable(false)
      .setPositiveButton("Yes",
        new DialogInterface.OnClickListener() {
         public void onClick(DialogInterface dialog,
           int id) {
          // if this button is clicked, close
          // current activity
          // Prop.this.finish();
          savePolygonAfterAlert();
         }
        })
      .setNegativeButton("No",
        new DialogInterface.OnClickListener() {
         public void onClick(DialogInterface dialog,
           int id) {
          // if this button is clicked, just close
          // the dialog box and do nothing
          dialog.cancel();
         }
        });

    // create alert dialog
    AlertDialog alertDialog = alertDialogBuilder.create();

    // show it
    alertDialog.show();
   } else {
    showDialog(context, "Alert", "Close geometry before saving");
   }
  } catch (Exception e) {

  }

 }

 /**
  * Save the Polygon made by user
  * 
  * @param view
  */

 public void savePolygonAfterAlert() {
  // save geometry of polygon
 }

 /**
  * Method to show the Dialog box
  * 
  * @param ctx
  * @param title
  * @param msg
  */
 public void showDialog(Context ctx, String title, String msg) {
  AlertDialog.Builder dialog = new AlertDialog.Builder(ctx);
  dialog.setTitle(title).setMessage(msg).setCancelable(true);
  dialog.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
   @Override
   public void onClick(DialogInterface dialog, int which) {
    dialog.dismiss();
   }
  });
  AlertDialog alertDialog = dialog.create();
  alertDialog.show();
 }
}

Download Complete Code : GoogleMapV2

Enjoy Coding .....   cheers :)