Android DatePicker example with onDateChanged listener

MainActivity.java

package com.bipin.rupadiya.datepikerexample;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.widget.DatePicker;
import android.widget.DatePicker.OnDateChangedListener;
import android.widget.TextView;

public class MainActivity extends Activity {

/** @author Bipin S Rupadiya , www.BipinRupadiya.com
     *  
     *   A DatePickerExample
     **/

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final TextView tv = (TextView) findViewById(R.id.textView);
tv.setText("Select Date");
DatePicker dp = (DatePicker) findViewById(R.id.datePicker);

dp.init(dp.getYear(), dp.getMonth(), dp.getDayOfMonth(),new OnDateChangedListener() {

@Override
public void onDateChanged(DatePicker arg0, int arg1, int arg2, int arg3) {
// TODO Auto-generated method stub
tv.setText(" "+arg3+ " / "+ (arg2+1) + " / "+arg1);
}
} );
}

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

}

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"
    android:gravity="center_horizontal"
    tools:context=".MainActivity" >

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="42dp"
        android:text="Large Text"
        android:textAppearance="?android:attr/textAppearanceLarge" />

    <DatePicker
        android:id="@+id/datePicker"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="44dp" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:gravity="center"
        android:text="www.BipinRupadiya.com" />

</RelativeLayout>