Adding multiple marker locations in Google Maps Android API V2 and save it in Shared Preferences

Step 1 :- Create New Android Project.



Step 2 :- Add Google-play-services_lib to your project.

Step 3 :- Open AndroidManifest.xml file.

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.mapv2.demo"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />
   
    <permission
          android:name="com.mapv2.demo.permission.MAPS_RECEIVE"
          android:protectionLevel="signature"/>

    <uses-permission android:name="com.mapv2.demo.permission.MAPS_RECEIVE"/>

    <uses-permission android:name="android.permission.INTERNET"/>
        <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
        <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES"/>
        <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
        <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>


    <uses-feature
        android:glEsVersion="0x00020000"
        android:required="true"/>  

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.mapv2.demo.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
       
        <meta-data
            android:name="com.google.android.maps.v2.API_KEY"
            android:value="AIzaSyCmX7SLVHXxU9pSqb2QbAOvdnjAGUulOrk" />
       
    </application>

</manifest>

Step 4 :- Open activity_main.xml.

<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=".MainActivity" >

    <fragment
        android:id="@+id/map"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        class="com.google.android.gms.maps.SupportMapFragment" />


</RelativeLayout>

Step 5 :- Open MainActivity.java

package com.mapv2.demo;

import android.app.Dialog;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.view.Menu;
import android.widget.Toast;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.GoogleMap.OnMapClickListener;
import com.google.android.gms.maps.GoogleMap.OnMapLongClickListener;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;

public class MainActivity extends FragmentActivity {
   
    GoogleMap googleMap;   
    SharedPreferences sharedPreferences;   
    int locationCount = 0;
    

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
       
       
        // Getting Google Play availability status
        int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(getBaseContext());

        // Showing status
        if(status!=ConnectionResult.SUCCESS){ // Google Play Services are not available

            int requestCode = 10;
            Dialog dialog = GooglePlayServicesUtil.getErrorDialog(status, this, requestCode);
            dialog.show();

        }else { // Google Play Services are available           

            // Getting reference to the SupportMapFragment of activity_main.xml
            SupportMapFragment fm = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);

            // Getting GoogleMap object from the fragment
            googleMap = fm.getMap();

            // Enabling MyLocation Layer of Google Map
            googleMap.setMyLocationEnabled(true);          
           
            // Opening the sharedPreferences object
            sharedPreferences = getSharedPreferences("location", 0);
           
            // Getting number of locations already stored
            locationCount = sharedPreferences.getInt("locationCount", 0);
           
                       
            // Getting stored zoom level if exists else return 0
            String zoom = sharedPreferences.getString("zoom", "0");
           
            // If locations are already saved
            if(locationCount!=0){             
               
                String lat = "";
                String lng = "";
               
                // Iterating through all the locations stored
                for(int i=0;i<locationCount;i++){
                   
                    // Getting the latitude of the i-th location
                    lat = sharedPreferences.getString("lat"+i,"0");
                   
                    // Getting the longitude of the i-th location
                    lng = sharedPreferences.getString("lng"+i,"0");
                   
                    // Drawing marker on the map
                    drawMarker(new LatLng(Double.parseDouble(lat), Double.parseDouble(lng)));                   
                }
               
                // Moving CameraPosition to last clicked position
                googleMap.moveCamera(CameraUpdateFactory.newLatLng(new LatLng(Double.parseDouble(lat), Double.parseDouble(lng))));
               
                // Setting the zoom level in the map on last position  is clicked
                googleMap.animateCamera(CameraUpdateFactory.zoomTo(Float.parseFloat(zoom)));                              
            }
           
        }       
       
        googleMap.setOnMapClickListener(new OnMapClickListener() {
           
            @Override
            public void onMapClick(LatLng point) {       
                locationCount++;
                                   
                // Drawing marker on the map
                drawMarker(point);
               
                /** Opening the editor object to write data to sharedPreferences */
                SharedPreferences.Editor editor = sharedPreferences.edit();           
               
                // Storing the latitude for the i-th location
                editor.putString("lat"+ Integer.toString((locationCount-1)), Double.toString(point.latitude));
               
                // Storing the longitude for the i-th location
                editor.putString("lng"+ Integer.toString((locationCount-1)), Double.toString(point.longitude));
               
                // Storing the count of locations or marker count
                editor.putInt("locationCount", locationCount);               
               
                /** Storing the zoom level to the shared preferences */
                editor.putString("zoom", Float.toString(googleMap.getCameraPosition().zoom));               

                /** Saving the values stored in the shared preferences */
                editor.commit();           
               
                Toast.makeText(getBaseContext(), "Marker is added to the Map", Toast.LENGTH_SHORT).show();                   
               
            }
        });   
       
       
        googleMap.setOnMapLongClickListener(new OnMapLongClickListener() {               
            @Override
            public void onMapLongClick(LatLng point) {
               
                // Removing the marker and circle from the Google Map
                googleMap.clear();
               
                // Opening the editor object to delete data from sharedPreferences
                SharedPreferences.Editor editor = sharedPreferences.edit();
               
                // Clearing the editor
                editor.clear();
               
                // Committing the changes
                editor.commit();
               
                // Setting locationCount to zero
                locationCount=0;
               
            }
        });          
       
       
    }
    
    private void drawMarker(LatLng point){
        // Creating an instance of MarkerOptions
        MarkerOptions markerOptions = new MarkerOptions();                   
           
        // Setting latitude and longitude for the marker
        markerOptions.position(point);
           
        // Adding marker on the Google Map
        googleMap.addMarker(markerOptions);           
    }
       
       

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

}


Step 6 :- Run Code.

Step 7 :- Download Code :- https://dl.dropboxusercontent.com/u/109954727/Map/map23.zip