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;
&lt;activity
android:name="com.mapv2.demo.MapDemoActivity"
android:label="@string/app_name" &gt;

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

Step 4 :- Open activity_main.xml.

xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >

<EditText
android:id="@+id/et_lat"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:inputType="numberDecimal|numberSigned"
android:hint="@string/hnt_lat" />

<EditText
android:id="@+id/et_lng"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:inputType="numberDecimal|numberSigned"
android:layout_below="@id/et_lat"
android:hint="@string/hnt_lng" />

<Button
android:id="@+id/btn_show"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/str_btn_show"
android:layout_below="@id/et_lng" />

1.) activity_map.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 android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends FragmentActivity {

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

// Getting reference to button btn_show
Button btnShow = (Button) findViewById(R.id.btn_show);

// Setting click event listener for the button
btnShow.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
double lat=0;
double lng=0;

// Getting reference to EditText et_lat
EditText etLat = (EditText) findViewById(R.id.et_lat);

// Validating User Input
if(etLat.getText().toString().isEmpty()){
Toast.makeText(getBaseContext(), "Please Enter Latitude", Toast.LENGTH_SHORT).show();

// Focus the EditText for Latitude
etLat.requestFocus();

return;
}else{
// Getting user input latitude
lat = Double.parseDouble(etLat.getText().toString());
}

// Getting reference to EditText et_lng
EditText etLng = (EditText) findViewById(R.id.et_lng);

// Validating User Input
if(etLng.getText().toString().isEmpty()){
Toast.makeText(getBaseContext(), "Please Enter Longitude", Toast.LENGTH_SHORT).show();

// Focus the EditText for Longitude
etLng.requestFocus();

return;
}else{
// Getting user input longitude
lng = Double.parseDouble(etLng.getText().toString());
}

Intent intent = new Intent(getBaseContext(), MapDemoActivity.class);

// Passing latitude and longitude to the MapActiv
intent.putExtra("lat", lat);
intent.putExtra("lng", lng);

startActivity(intent);
}
});

}

@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;
}
}

1.) MapDemoActivity.java

package com.mapv2.demo;

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

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

public class MapDemoActivity extends FragmentActivity{

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

// Receiving latitude from MainActivity screen
double latitude = getIntent().getDoubleExtra("lat", 0);

// Receiving longitude from MainActivity screen
double longitude = getIntent().getDoubleExtra("lng", 0);

LatLng position = new LatLng(latitude, longitude);

// Instantiating MarkerOptions class
MarkerOptions options = new MarkerOptions();

// Setting position for the MarkerOptions
options.position(position);

// Setting title for the MarkerOptions
options.title("Position");

// Setting snippet for the MarkerOptions
options.snippet("Latitude:"+latitude+",Longitude:"+longitude);

// Getting Reference to SupportMapFragment of activity_map.xml
SupportMapFragment fm = (SupportMapFragment)getSupportFragmentManager().findFragmentById(R.id.map);

// Getting reference to google map
GoogleMap googleMap = fm.getMap();

// Adding Marker on the Google Map
googleMap.addMarker(options);

// Creating CameraUpdate object for position
CameraUpdate updatePosition = CameraUpdateFactory.newLatLng(position);

// Creating CameraUpdate object for zoom
CameraUpdate updateZoom = CameraUpdateFactory.zoomBy(4);

// Updating the camera position to the user input latitude and longitude
googleMap.moveCamera(updatePosition);

// Applying zoom to the marker position
googleMap.animateCamera(updateZoom);
}

@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.