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This is a simple example about using widget calendar under Andoid OS.
Can be easy to do it if you know the basic of the programming.
First you need to make one application ( I use Android Studio – version 0.5.1).
Let’s see my example:
My application use:
the class is :
public class MainActivity extends ActionBarActivity
the project is set with this :
com.example.calendar.app
the widget is : CalendarView
I make this changes into this source files :

• MainActivity,java
• AndroidManifest.xml
• activity_main.xml
• main.xml
• strings.xml

Let’s see the source code for this files:
The result working well. Also you can see in this picture the calendar result …

MainActivity.java

package com.example.calendar.app;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.CalendarView;
import android.widget.CalendarView.OnDateChangeListener;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity {
    CalendarView calendar;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // this can be add to make calendar
        calendar = (CalendarView) findViewById(R.id.calendar);
        calendar.setOnDateChangeListener(new OnDateChangeListener(){

            @Override
            public void onSelectedDayChange(CalendarView view,
                                            int year, int month, int dayOfMonth) {
                Toast.makeText(getApplicationContext(),
                        dayOfMonth +"/"+month+"/"+ year,Toast.LENGTH_LONG).show();}});
    }

    @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;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.calendar.app" >

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.calendar.app.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>

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:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context="com.example.calendar.app.MainActivity">

    <CalendarView
        android:id="@+id/calendar"
        android:layout_centerInParent="true"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</RelativeLayout>

main.xml

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    tools:context="com.example.calendar.app.MainActivity" >
    
    <item android:id="@+id/action_settings"
        android:title="@string/action_settings"
        android:orderInCategory="100"
        app:showAsAction="never" />
</menu>

strings.xml

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

    <string name="app_name">calendar</string>
    <string name="calendar">Calendar</string>
    <string name="action_settings">Settings</string>

</resources>

The result working well. Also you can see in this picture the calendar result …