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"?-->
package="com.mapv2.demo"
android:versionCode="1"
android:versionName="1.0" &gt;

&lt;uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" /&gt;

&lt;permission
android:name="com.mapv2.demo.permission.MAPS_RECEIVE"
android:protectionLevel="signature"/&gt;

&nbsp;

&nbsp;

&lt;uses-feature
android:glEsVersion="0x00020000"
android:required="true"/&gt;

&lt;application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" &gt;
&lt;activity
android:name="com.mapv2.demo.MainActivity"
android:label="@string/app_name" &gt;
&nbsp;

&lt;meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="AIzaSyCmX7SLVHXxU9pSqb2QbAOvdnjAGUulOrk"/&gt;

&nbsp;

Step 4 :- Open activity_main.xml.

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"
/>

Step 5 :- Open MainActivity.java

package com.mapv2.demo;

import java.util.ArrayList;

import android.graphics.Color;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.view.Menu;

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

public class MainActivity extends FragmentActivity {

GoogleMap googleMap;
ArrayList points;

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

points = new ArrayList();

// 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);

// Setting OnClick event listener for the Google Map
googleMap.setOnMapClickListener(new OnMapClickListener() {

@Override
public void onMapClick(LatLng point) {

// Instantiating the class MarkerOptions to plot marker on the map
MarkerOptions markerOptions = new MarkerOptions();

// Setting latitude and longitude of the marker position
markerOptions.position(point);

// Setting titile of the infowindow of the marker
markerOptions.title("Position");

// Setting the content of the infowindow of the marker
markerOptions.snippet("Latitude:"+point.latitude+","+"Longitude:"+point.longitude);

// Instantiating the class PolylineOptions to plot polyline in the map
PolylineOptions polylineOptions = new PolylineOptions();

// Setting the color of the polyline
polylineOptions.color(Color.RED);

// Setting the width of the polyline
polylineOptions.width(3);

// Adding the taped point to the ArrayList
points.add(point);

// Setting points of polyline
polylineOptions.addAll(points);

// Adding the polyline to the map
googleMap.addPolyline(polylineOptions);

// Adding the marker to the map
googleMap.addMarker(markerOptions);

}
});

googleMap.setOnMapLongClickListener(new OnMapLongClickListener() {

@Override
public void onMapLongClick(LatLng point) {
// Clearing the markers and polylines in the google map
googleMap.clear();

// Empty the array list
points.clear();
}
});

}

@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.