DatePickerActivity.java

package course.examples.UI.datepicker;

import java.util.Calendar;

import android.app.Activity;
import android.app.DatePickerDialog;
import android.app.Dialog;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.TextView;

// This application uses some deprecated methods. 
// See UIDatePickerFragmentActivity for a more modern version of this application

public class DatePickerActivity extends Activity {

	private TextView mDateDisplay;
	private Button mPickDate;
	private int mYear;
	private int mMonth;
	private int mDay;

	static final int DATE_DIALOG_ID = 0;

	// The callback received when the user "sets" the date in the Dialog
	private DatePickerDialog.OnDateSetListener mDateSetListener = new DatePickerDialog.OnDateSetListener() {

		public void onDateSet(DatePicker view, int year, int monthOfYear,
				int dayOfMonth) {
			mYear = year;
			mMonth = monthOfYear;
			mDay = dayOfMonth;
			updateDisplay();
		}
	};

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		// Capture our View elements
		mDateDisplay = (TextView) findViewById(R.id.dateDisplay);
		mPickDate = (Button) findViewById(R.id.pickDate);

		// Set an OnClickListener on the Change The Date Button
		mPickDate.setOnClickListener(new View.OnClickListener() {
			@SuppressWarnings("deprecation")
			public void onClick(View v) {
				showDialog(DATE_DIALOG_ID);
			}
		});

		// Get the current date
		final Calendar c = Calendar.getInstance();
		mYear = c.get(Calendar.YEAR);
		mMonth = c.get(Calendar.MONTH);
		mDay = c.get(Calendar.DAY_OF_MONTH);

		// Display the current date
		updateDisplay();
	}

	// Update the date in the TextView
	private void updateDisplay() {
		mDateDisplay.setText(new StringBuilder()
				// Month is 0 based so add 1
				.append(mMonth + 1).append("-").append(mDay).append("-")
				.append(mYear).append(" "));
	}

	// Create and return DatePickerDialog
	@Override
	protected Dialog onCreateDialog(int id) {
		switch (id) {
		case DATE_DIALOG_ID:
			return new DatePickerDialog(this, mDateSetListener, mYear, mMonth,
					mDay);
		}
		return null;
	}
}