qw-notes/java/net/micode/notes/ui/DateTimePickerDialog.java

/*
 * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
 *
 * 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 net.micode.notes.ui;

import java.util.Calendar;
import net.micode.notes.R;
import net.micode.notes.ui.DateTimePicker;
import net.micode.notes.ui.DateTimePicker.OnDateTimeChangedListener;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.text.format.DateFormat;
import android.text.format.DateUtils;

/**
 * 日期时间选择对话框，继承自AlertDialog
 * 封装了DateTimePicker控件，提供完整的日期时间选择功能
 */
public class DateTimePickerDialog extends AlertDialog implements OnClickListener {

    private Calendar mDate = Calendar.getInstance(); // 当前选择的日期时间
    private boolean mIs24HourView; // 是否为24小时制
    private OnDateTimeSetListener mOnDateTimeSetListener; // 日期时间设置回调接口
    private DateTimePicker mDateTimePicker; // 内嵌的日期时间选择器

    /**
     * 日期时间设置回调接口
     */
    public interface OnDateTimeSetListener {
        void OnDateTimeSet(AlertDialog dialog, long date);
    }

    /**
     * 构造函数
     * @param context 上下文
     * @param date 初始日期时间(毫秒数)
     */
    public DateTimePickerDialog(Context context, long date) {
        super(context);
        // 初始化日期时间选择器
        mDateTimePicker = new DateTimePicker(context);
        setView(mDateTimePicker);

        // 设置日期时间变化监听
        mDateTimePicker.setOnDateTimeChangedListener(new OnDateTimeChangedListener() {
            public void onDateTimeChanged(DateTimePicker view, int year, int month,
                                          int dayOfMonth, int hourOfDay, int minute) {
                // 更新当前选择的日期时间
                mDate.set(Calendar.YEAR, year);
                mDate.set(Calendar.MONTH, month);
                mDate.set(Calendar.DAY_OF_MONTH, dayOfMonth);
                mDate.set(Calendar.HOUR_OF_DAY, hourOfDay);
                mDate.set(Calendar.MINUTE, minute);
                updateTitle(mDate.getTimeInMillis());
            }
        });

        // 设置初始日期时间
        mDate.setTimeInMillis(date);
        mDate.set(Calendar.SECOND, 0);
        mDateTimePicker.setCurrentDate(mDate.getTimeInMillis());

        // 设置对话框按钮
        setButton(context.getString(R.string.datetime_dialog_ok), this);
        setButton2(context.getString(R.string.datetime_dialog_cancel), (OnClickListener)null);

        // 设置时间显示格式并更新标题
        set24HourView(DateFormat.is24HourFormat(this.getContext()));
        updateTitle(mDate.getTimeInMillis());
    }

    /**
     * 设置是否使用24小时制
     * @param is24HourView true表示24小时制，false表示12小时制
     */
    public void set24HourView(boolean is24HourView) {
        mIs24HourView = is24HourView;
    }

    /**
     * 设置日期时间设置回调
     * @param callBack 回调接口
     */
    public void setOnDateTimeSetListener(OnDateTimeSetListener callBack) {
        mOnDateTimeSetListener = callBack;
    }

    /**
     * 更新对话框标题显示当前选择的日期时间
     * @param date 日期时间(毫秒数)
     */
    private void updateTitle(long date) {
        int flag = DateUtils.FORMAT_SHOW_YEAR | DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_TIME;
        flag |= mIs24HourView ? DateUtils.FORMAT_24HOUR : DateUtils.FORMAT_24HOUR;
        setTitle(DateUtils.formatDateTime(this.getContext(), date, flag));
    }

    /**
     * 确定按钮点击事件处理
     */
    public void onClick(DialogInterface arg0, int arg1) {
        if (mOnDateTimeSetListener != null) {
            mOnDateTimeSetListener.OnDateTimeSet(this, mDate.getTimeInMillis());
        }
    }
}