Android Date Picker Example App

I have a friend who often asks: "What day of the week is [insert date here]?" So I decided to create a simple app for him to easily know what day of the week is a certain date. After I made this simple app, I also find it fun to use, haha! Now I know what day of the week I was born, it was Monday (July 30, 1990)!

Video Demo

Here's the final output of our code for today.

Video Demo Permalink

Live Demo

In case you want to try it yourself, I uploaded this simple app in my play store account. Download it here: Day Of Week Ninja, or you can just search for "day of week ninja" in your android device.

Let's Code

MainActivity.java - code to run this android date picker example are just in this one file.

package com.example.datepickerlistener;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;

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

public class MainActivity extends Activity {

    DatePicker datePickerBirthday;
    TextView textViewUserDate;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        // create the date picker
        datePickerBirthday = new DatePicker(this);
        
        // hide the whole calendar view (works in api 11 or greater)
        int currentapiVersion = android.os.Build.VERSION.SDK_INT;
        if (currentapiVersion >= 11) {
            datePickerBirthday.setCalendarViewShown(false);
        }

        // create the TextView
        textViewUserDate = new TextView(this);
        textViewUserDate.setGravity(Gravity.CENTER);
        
        // initialize the date to current date
        SimpleDateFormat sdfDateTime = new SimpleDateFormat("yyyy-MM-dd", Locale.US);
        String dateStr = sdfDateTime.format(new Date(System.currentTimeMillis()));
        
        String[] dateSplit = dateStr.split("-");
        int currentYear = Integer.parseInt(dateSplit[0]);
        int currentMonth = Integer.parseInt(dateSplit[1]);
        int currentDay = Integer.parseInt(dateSplit[2]);
        
        // to show date and day of week in the TextView
        setHumanReadableDate(currentYear, currentMonth, currentDay);

        // initialize date picker listener
        // currentMonth - 1, because on the picker, 0 is January
        datePickerBirthday.init(currentYear, currentMonth - 1, currentDay, birthdayListener);

        // add to the container
        LinearLayout linearLayoutCalTvContainer = new LinearLayout(this);
        linearLayoutCalTvContainer.setOrientation(LinearLayout.VERTICAL);
        linearLayoutCalTvContainer.addView(datePickerBirthday);
        linearLayoutCalTvContainer.addView(textViewUserDate);

        // set the views for the activity
        setContentView(linearLayoutCalTvContainer);

    }

    // the date picker listener
    OnDateChangedListener birthdayListener = new OnDateChangedListener() {
        
        @Override
        public void onDateChanged(DatePicker birthDayDatePicker,
                int newYear, int newMonth, int newDay) {

            try{
                
                // currentMonth + 1, to retrieve proper month
                setHumanReadableDate(newYear, newMonth + 1, newDay);
                
            } catch (NullPointerException e) {
                e.printStackTrace();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    };
    
    // show the user a better date format
    public void setHumanReadableDate(int newYear, int newMonth, int newDay){
        try {
            
            String clickedDate = newYear + "-" + newMonth + "-" + newDay;
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
            Date d = sdf.parse(clickedDate);

            SimpleDateFormat sdfDateTime = new SimpleDateFormat("MMMM dd, yyyy 'is' EEEE", Locale.US);
            String dateStr = sdfDateTime.format(d);
            
            textViewUserDate.setText(dateStr);
            
        } catch (ParseException e) {
            e.printStackTrace();
        }
    }

}

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