Links & Dependenciesactivity_main.xmlMainActivity.java

Library with installation instructions:

github.com/square/android-times-square

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.codinginflow.timesquareexample.MainActivity">

    <com.squareup.timessquare.CalendarPickerView
        android:id="@+id/calendar"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</android.support.constraint.ConstraintLayout>

package com.codinginflow.timesquareexample;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Toast;

import com.squareup.timessquare.CalendarPickerView;

import java.text.DateFormat;
import java.util.Calendar;
import java.util.Date;

public class MainActivity extends AppCompatActivity {

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

        Date today = new Date();
        Calendar nextYear = Calendar.getInstance();
        nextYear.add(Calendar.YEAR, 1);

        CalendarPickerView datePicker = findViewById(R.id.calendar);
        datePicker.init(today, nextYear.getTime())
                .inMode(CalendarPickerView.SelectionMode.RANGE)
                .withSelectedDate(today);
        
        datePicker.setOnDateSelectedListener(new CalendarPickerView.OnDateSelectedListener() {
            @Override
            public void onDateSelected(Date date) {
                //String selectedDate = DateFormat.getDateInstance(DateFormat.FULL).format(date);

                Calendar calSelected = Calendar.getInstance();
                calSelected.setTime(date);

                String selectedDate = "" + calSelected.get(Calendar.DAY_OF_MONTH)
                        + " " + (calSelected.get(Calendar.MONTH) + 1)
                        + " " + calSelected.get(Calendar.YEAR);

                Toast.makeText(MainActivity.this, selectedDate, Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onDateUnselected(Date date) {

            }
        });
    }
}