/* * 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. */ /*版权和许可证声明,说明了该文件的版权信息以及遵循的许可协议*/ 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; /*设置了代码的包名,并导入了所需的类和接口*/ public class DateTimePickerDialog extends AlertDialog implements OnClickListener { /*定义了一个名为 DateTimePickerDialog 的公共类,它扩展了 AlertDialog 并实现了 OnClickListener 接口。*/ private Calendar mDate = Calendar.getInstance(); private boolean mIs24HourView; private OnDateTimeSetListener mOnDateTimeSetListener; private DateTimePicker mDateTimePicker; /*声明了一些私有变量,用于存储日期时间信息、24小时格式标志、监听器和日期时间选择器。 */ public interface OnDateTimeSetListener { void OnDateTimeSet(AlertDialog dialog, long date); } /*定义了一个内部接口 OnDateTimeSetListener,用于接收日期时间设置事件的回调。 */ public DateTimePickerDialog(Context context, long date) { super(context); /*构造函数初始化父类 AlertDialog */ mDateTimePicker = new DateTimePicker(context); setView(mDateTimePicker);/*创建一个 DateTimePicker 实例并设置为对话框的内容视图*/ mDateTimePicker.setOnDateTimeChangedListener(new OnDateTimeChangedListener() { public void onDateTimeChanged(DateTimePicker view, int year, int month, int dayOfMonth, int hourOfDay, int minute) { 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()); } });/*为 DateTimePicker 设置监听器,在日期时间改变时更新内部的日历对象,并调用 updateTitle 方法更新对话框标题 */ mDate.setTimeInMillis(date); mDate.set(Calendar.SECOND, 0); mDateTimePicker.setCurrentDate(mDate.getTimeInMillis()); setButton(context.getString(R.string.datetime_dialog_ok), this); setButton2(context.getString(R.string.datetime_dialog_cancel), (OnClickListener)null); set24HourView(DateFormat.is24HourFormat(this.getContext())); updateTitle(mDate.getTimeInMillis()); } /*初始化日期时间对象,并设置到 DateTimePicker 中。设置对话框的确认和取消按钮,并根据系统设置决定是否使用24小时制显示时间。最后更新对话框标题。 */ public void set24HourView(boolean is24HourView) { mIs24HourView = is24HourView; } /*设置是否使用24小时制显示时间的方法*/ public void setOnDateTimeSetListener(OnDateTimeSetListener callBack) { mOnDateTimeSetListener = callBack; } /*设置监听器的方法*/ 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)); } /*更新对话框标题的方法,根据当前日期时间和格式化标志来显示日期时间。*/ public void onClick(DialogInterface arg0, int arg1) { if (mOnDateTimeSetListener != null) { mOnDateTimeSetListener.OnDateTimeSet(this, mDate.getTimeInMillis()); } }/*实现 OnClickListener 接口的 onClick 方法,当点击对话框上的按钮时,如果设置了监听器,则调用其 OnDateTimeSet 方法*/ }/*类定义结束*/