DatePickerFragmentActivity.java

package course.examples.UI.datepicker;

import java.util.Calendar;

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

public class DatePickerFragmentActivity extends Activity implements OnDateSetListener {

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

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

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

		// Set an OnClickListener for the Change the Date Button
		mPickDate.setOnClickListener(new View.OnClickListener() {
			public void onClick(View v) {
				
				// Create a new DatePickerFragment
				DialogFragment newFragment = new DatePickerFragment();
				
				// Display DatePickerFragment
				newFragment.show(getFragmentManager(), "DatePicker");
			}
		});
	}

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

	// Update the date String 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(" "));
	}

	public static class DatePickerFragment extends DialogFragment implements
			OnDateSetListener {

		@Override
		public Dialog onCreateDialog(Bundle savedInstanceState) {

			// Set the current date in the DatePickerFragment
			final Calendar c = Calendar.getInstance();
			int year = c.get(Calendar.YEAR);
			int month = c.get(Calendar.MONTH);
			int day = c.get(Calendar.DAY_OF_MONTH);

			// Create a new instance of DatePickerDialog and return it
			return new DatePickerDialog(getActivity(), this, year, month, day);

		}

		// Callback to DatePickerActivity.onDateSet() to update the UI
		@Override
		public void onDateSet(DatePicker view, int year, int monthOfYear,
				int dayOfMonth) {

			((OnDateSetListener) getActivity()).onDateSet(view, year,
					monthOfYear, dayOfMonth);

		}
	}
}