With androids date picker you can easily choose a date without much code.

Guide How To

1.Add latest appcompat library to your build.gradle.

dependencies {
        ...
    compile 'com.android.support:appcompat-v7:26.+' // set exact version here
}

2.Make sure, that your activity extends android.support.v7.app.AppCompatActivity.

public class MainActivity extends AppCompatActivity { ... }

3.Create your DatePickerDialog and set a context, a listener and the start year, month and day.

DatePickerDialog datePickerDialog = new DatePickerDialog(
                        context, 
                        listener, 
                        startYear, 
                        starthMonth, 
                        startDay);

4.Optional: Advanced options for your date picker

DatePicker datePicker = datePickerDialog.getDatePicker();

//set minimum date to select
datePicker.setMinDate(long minDate);

//set maximum date to select
datePicker.setMaxDate(long maxDate);

//set the first day of a week
datePicker.setFirstDayOfWeek(int firstDayOfWeek)

//update the current date
datePicker.updateDate(int year, int month, int day);

5.Show your date picker using the show() method.

datePickerDialog.show()

Code Example

//create an datePickerListener to get the selected date. Needs to be done, before creating the date picker
private DatePickerDialog.OnDateSetListener dateListener = new DatePickerDialog.OnDateSetListener() {
    @Override
    public void onDateSet(DatePicker view, int Year, int Month, int Day) {

        //Year is now the selected year
        //Month + 1 is the selected month. Note: add 1, because months starts from 0 in android
        //Day is the selected day

            Toast.makeText(MainYctivity.this, "Selected date: " + Year + "-" + (Month + 1) + "-" + Day, Toast.LENGTH_SHORT).show();
            
    }
};

//init calendar to get the current year, month and day
Calendar cal = Calendar.getInstance();

//creating the DatePickerDialog
DatePickerDialog dialog = new DatePickerDialog(MainActivity.this, 
                        dateListener,   //set the listener
                        cal.get(Calendar.YEAR), 
                        cal.get(Calendar.MONTH), 
                        cal.get(Calendar.DAY_OF_MONTH));

//optional set starting day (from today)
dialog.getDatePicker().setMinDate(new Date().getTime());

//show picker
dialog.show();