Android example source code file (DatePickerDialog.java)

This example Android source code file (DatePickerDialog.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

alertdialog, android, bundle, calendar, content, dateformatsymbols, datepickerdialog, day, layoutinflater, month, onclicklistener, ondatesetlistener, os, override, string, textview, ui, view, widget, year

The DatePickerDialog.java Android example source code

/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.app;

import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;
import android.text.TextUtils.TruncateAt;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.DatePicker;
import android.widget.TextView;
import android.widget.DatePicker.OnDateChangedListener;

import com.android.internal.R;

import java.text.DateFormatSymbols;
import java.util.Calendar;

/**
 * A simple dialog containing an {@link android.widget.DatePicker}.
 */
public class DatePickerDialog extends AlertDialog implements OnClickListener,
        OnDateChangedListener {

    private static final String YEAR = "year";
    private static final String MONTH = "month";
    private static final String DAY = "day";

    private final DatePicker mDatePicker;
    private final OnDateSetListener mCallBack;
    private final Calendar mCalendar;
    private final java.text.DateFormat mTitleDateFormat;
    private final String[] mWeekDays;

    private int mInitialYear;
    private int mInitialMonth;
    private int mInitialDay;

    /**
     * The callback used to indicate the user is done filling in the date.
     */
    public interface OnDateSetListener {

        /**
         * @param view The view associated with this listener.
         * @param year The year that was set.
         * @param monthOfYear The month that was set (0-11) for compatibility
         *  with {@link java.util.Calendar}.
         * @param dayOfMonth The day of the month that was set.
         */
        void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth);
    }

    /**
     * @param context The context the dialog is to run in.
     * @param callBack How the parent is notified that the date is set.
     * @param year The initial year of the dialog.
     * @param monthOfYear The initial month of the dialog.
     * @param dayOfMonth The initial day of the dialog.
     */
    public DatePickerDialog(Context context,
            OnDateSetListener callBack,
            int year,
            int monthOfYear,
            int dayOfMonth) {
        this(context, com.android.internal.R.style.Theme_Dialog_Alert,
                callBack, year, monthOfYear, dayOfMonth);
    }

    /**
     * @param context The context the dialog is to run in.
     * @param theme the theme to apply to this dialog
     * @param callBack How the parent is notified that the date is set.
     * @param year The initial year of the dialog.
     * @param monthOfYear The initial month of the dialog.
     * @param dayOfMonth The initial day of the dialog.
     */
    public DatePickerDialog(Context context,
            int theme,
            OnDateSetListener callBack,
            int year,
            int monthOfYear,
            int dayOfMonth) {
        super(context, theme);

        mCallBack = callBack;
        mInitialYear = year;
        mInitialMonth = monthOfYear;
        mInitialDay = dayOfMonth;
        DateFormatSymbols symbols = new DateFormatSymbols();
        mWeekDays = symbols.getShortWeekdays();

        mTitleDateFormat = java.text.DateFormat.
                                getDateInstance(java.text.DateFormat.FULL);
        mCalendar = Calendar.getInstance();
        updateTitle(mInitialYear, mInitialMonth, mInitialDay);

        setButton(BUTTON_POSITIVE, context.getText(R.string.date_time_set), this);
        setButton(BUTTON_NEGATIVE, context.getText(R.string.cancel), (OnClickListener) null);
        setIcon(R.drawable.ic_dialog_time);

        LayoutInflater inflater =
                (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View view = inflater.inflate(R.layout.date_picker_dialog, null);
        setView(view);
        mDatePicker = (DatePicker) view.findViewById(R.id.datePicker);
        mDatePicker.init(mInitialYear, mInitialMonth, mInitialDay, this);
    }

    @Override
    public void show() {
        super.show();

        /* Sometimes the full month is displayed causing the title
         * to be very long, in those cases ensure it doesn't wrap to
         * 2 lines (as that looks jumpy) and ensure we ellipsize the end.
         */
        TextView title = (TextView) findViewById(R.id.alertTitle);
        title.setSingleLine();
        title.setEllipsize(TruncateAt.END);
    }

    public void onClick(DialogInterface dialog, int which) {
        if (mCallBack != null) {
            mDatePicker.clearFocus();
            mCallBack.onDateSet(mDatePicker, mDatePicker.getYear(),
                    mDatePicker.getMonth(), mDatePicker.getDayOfMonth());
        }
    }

    public void onDateChanged(DatePicker view, int year,
            int month, int day) {
        updateTitle(year, month, day);
    }

    public void updateDate(int year, int monthOfYear, int dayOfMonth) {
        mInitialYear = year;
        mInitialMonth = monthOfYear;
        mInitialDay = dayOfMonth;
        mDatePicker.updateDate(year, monthOfYear, dayOfMonth);
    }

    private void updateTitle(int year, int month, int day) {
        mCalendar.set(Calendar.YEAR, year);
        mCalendar.set(Calendar.MONTH, month);
        mCalendar.set(Calendar.DAY_OF_MONTH, day);
        setTitle(mTitleDateFormat.format(mCalendar.getTime()));
    }

    @Override
    public Bundle onSaveInstanceState() {
        Bundle state = super.onSaveInstanceState();
        state.putInt(YEAR, mDatePicker.getYear());
        state.putInt(MONTH, mDatePicker.getMonth());
        state.putInt(DAY, mDatePicker.getDayOfMonth());
        return state;
    }

    @Override
    public void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        int year = savedInstanceState.getInt(YEAR);
        int month = savedInstanceState.getInt(MONTH);
        int day = savedInstanceState.getInt(DAY);
        mDatePicker.init(year, month, day, this);
        updateTitle(year, month, day);
    }
}