Showing current location in Google Maps using API V2

Introduction:

  If you have developed any app that contains Google Maps v1, It’s time to upgrade it to Google Maps V2 as google maps version 1 deprecated officially on December 3rd, 2012 and it won’t work anymore.

demo

Using this code

1. Downloading Google Play Services

    Open Eclipse ⇒ Windows ⇒ Android SDK Manager and check whether you have   already downloaded Google Play Services or not under Extras section. If not select play services and install the package.

                      

2.Importing Google Play Services into Eclipse

   
After downloading play services we need to import it to Eclipse which will be used as a library for our maps project. 

     In Eclipse goto File ⇒ Import ⇒ Android ⇒ Existing Android Code Into                      Workspace.

     Click on Browse and select Google Play Services project from your android sdk                folder.You can locate play services library project from   android-sdk-                                windows\extras\google\google_play_services\libproject\google-play- services_lib

     Importantly while importing check Copy projects into workspace option.

3. Getting the Google Maps API key

Same as in maps v1 we need to generate SHA-1 fingerprint using java keytool. Open your terminal and execute the following command to generate SHA-1 fingerprint. 

On Windows

keytool -list -v -keystore "%USERPROFILE%\.android\debug.keystore" -alias androiddebugkey -storepass android -keypass android 

4.Getting key from google console

1.Open Google API Console
2.Select Services on left side and turn on Google Maps Android API v2.
3.In the left navigation bar, click API Access.
4.In the resulting page, click Create New Android Key...
5.In the API Access tab select Create new Android key. In the Dialog paste your SHA1        fingerprint with your package name separated by semicolon. 

5.Creating Project

      Create a new project in eclipse as File->New->Android Application Project. In the dialog give Application name and Package name. Create the Main Activity as MainActivity.java and Main layout as activity_main.xml. Here my applicaion name is GoogleMapApiV2 and my package name is com.amal.googlemap. Right click on the project and select properties. In the dialog under the Library section select Add and add the google_play_services_lib as library as given below. 

6.Creating Layout

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout 
 xmlns:android="http://schemas.android.com/apk/res/android"

 android:layout_width="fill_parent"

 android:layout_height="fill_parent" >

<TextView

 android:id="@+id/textView1"

 android:layout_width="match_parent"

 android:layout_height="wrap_content"/>

<fragment

 android:id="@+id/map"

 android:name="com.google.android.gms.maps.SupportMapFragment"

 android:layout_width="match_parent"

 android:layout_below="@+id/textView1"

 android:layout_height="match_parent" />

</RelativeLayout>

MainActivity.java

package com.example.googlemaps_v2;

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.SupportMapFragment;

import com.google.android.gms.maps.model.LatLng;

import com.google.android.gms.maps.model.MarkerOptions;

import android.support.v4.app.FragmentActivity;

import android.widget.TextView;

import android.app.Dialog;

import android.content.Context;

import android.location.Criteria;

import android.location.Location;

import android.location.LocationListener;

import android.location.LocationManager;

import android.os.Bundle;

public class MainActivity extends FragmentActivity implements 
LocationListener {

GoogleMap googleMap;

SupportMapFragment mapFragment;

Context context;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

context=this;

mapFragment = ((SupportMapFragment)getSupportFragmentManager().findFragmentById(R.id.map));

googleMap=mapFragment.getMap();

int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(getBaseContext());

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

int requestCode = 10;

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

dialog.show();

}

else

{

// Enabling MyLocation Layer of Google Map

googleMap.setMyLocationEnabled(true);

// Getting LocationManager object from System Service LOCATION_SERVICE

LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);

// Creating a criteria object to retrieve provider

Criteria criteria = new Criteria();

// Getting the name of the best provider

String provider = locationManager.getBestProvider(criteria, true);

// Getting Current Location

Location location = locationManager.getLastKnownLocation(provider);

if(location!=null){

onLocationChanged(location);

}

locationManager.requestLocationUpdates(provider, 20000, 0, this);

}

}

public void onLocationChanged(Location location) {

TextView tvLocation = (TextView) findViewById(R.id.textView1);

// Getting latitude of the current location

double latitude = location.getLatitude();

// Getting longitude of the current location

double longitude = location.getLongitude();

// Creating a LatLng object for the current location

LatLng latLng = new LatLng(latitude, longitude);

// Showing the current location in Google Map

googleMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));

// Zoom in the Google Map

googleMap.animateCamera(CameraUpdateFactory.zoomTo(15));

// Setting latitude and longitude in the TextView tv_location

tvLocation.setText("Latitude:" + latitude + ", Longitude:"+ longitude );

// create marker

MarkerOptions marker = new MarkerOptions().position(new LatLng(latitude, longitude)).title("Hello Maps");

// adding marker

googleMap.addMarker(marker);

}

@Override

public void onProviderDisabled(String provider) {

// TODO Auto-generated method stub

}

@Override

public void onProviderEnabled(String provider) {

// TODO Auto-generated method stub

}

@Override

public void onStatusChanged(String provider, int status, Bundle extras) {

// TODO Auto-generated method stub

}

}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="com.example.googlemaps_v2"

android:versionCode="1"

android:versionName="1.0" >

<uses-sdk

android:minSdkVersion="16"

android:targetSdkVersion="20" />

<uses-permission android:name="android.permission.INTERNET" />

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

<!-- Required OpenGL ES 2.0. for Maps V2 -->

<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" >

<meta-data

android:name="com.google.android.gms.version"

android:value="@integer/google_play_services_version" />

<meta-data

android:name="com.google.android.maps.v2.API_KEY"

android:value="-------API KEY--------" />

<activity

android:name="com.example.googlemaps_v2.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>

</application>

</manifest>

Happy coding...

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