stackoverflow当中关于DateTimePicker问题的答案的改进版

stackoverflow问题地址：http://stackoverflow.com/questions/2055509/datetime-picker-in-android-application

本例子采用的方案雏形：https://github.com/krishjlk/android-date-and-time-picker-dialog-example-sample

示例项目下载地址

UI示例：

代码：

package com.yang.datetimepicker;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;import android.app.Activity;import android.app.Dialog;import android.view.View;import android.view.View.OnClickListener;import android.view.Window;import android.widget.Button;import android.widget.DatePicker;import android.widget.TimePicker;public class DateTimePickerDialog implements OnClickListener {	private DatePicker datePicker;	private TimePicker timePicker;	private Button btn_set, btn_cancel;	private Calendar calendar_date = null;	private Activity activity;	private ICustomDateTimeListener iCustomDateTimeListener = null;	private Dialog dialog;	private boolean is24HourView = true;	public DateTimePickerDialog(Activity a,			ICustomDateTimeListener customDateTimeListener) {		activity = a;		iCustomDateTimeListener = customDateTimeListener;		dialog = new Dialog(activity);		dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);		View dialogView = getDateTimePickerLayout();		dialog.setContentView(dialogView);	}	public View getDateTimePickerLayout() {		View view = View.inflate(activity, R.layout.datetime_picker_dialog, null);				datePicker = (DatePicker) view.findViewById(R.id.datePicker);		timePicker = (TimePicker) view.findViewById(R.id.timePicker);		btn_set = (Button)view.findViewById(R.id.btn_set);		btn_set.setOnClickListener(this);		btn_cancel =(Button)view.findViewById(R.id.btn_cancel);		btn_cancel.setOnClickListener(this);		return view;	}	public void showDialog() {		if (!dialog.isShowing()) {			if (calendar_date == null)				calendar_date = Calendar.getInstance();			timePicker.setIs24HourView(is24HourView);			timePicker.setCurrentHour(calendar_date.get(Calendar.HOUR_OF_DAY));			timePicker.setCurrentMinute(calendar_date.get(Calendar.MINUTE));			datePicker.updateDate(calendar_date.get(Calendar.YEAR),					calendar_date.get(Calendar.MONTH),					calendar_date.get(Calendar.DATE));			dialog.show();		}	}	public void dismissDialog() {		if (!dialog.isShowing())			dialog.dismiss();	}	public void setDate(Calendar calendar) {		if (calendar != null)			calendar_date = calendar;	}	public void setDate(Date date) {		if (date != null) {			calendar_date = Calendar.getInstance();			calendar_date.setTime(date);		}	}	public void setDate(int year, int month, int day) {		if (month < 12 && month >= 0 && day < 32 && day >= 0 && year > 100				&& year < 3000) {			calendar_date = Calendar.getInstance();			calendar_date.set(year, month, day);		}	}	public void setTimeIn24HourFormat(int hourIn24Format, int minute) {		if (hourIn24Format < 24 && hourIn24Format >= 0 && minute >= 0				&& minute < 60) {			if (calendar_date == null)				calendar_date = Calendar.getInstance();			calendar_date.set(calendar_date.get(Calendar.YEAR),					calendar_date.get(Calendar.MONTH),					calendar_date.get(Calendar.DAY_OF_MONTH), hourIn24Format,					minute);			is24HourView = true;		}	}	public void setTimeIn12HourFormat(int hourIn12Format, int minute,			boolean isAM) {		if (hourIn12Format < 13 && hourIn12Format > 0 && minute >= 0				&& minute < 60) {			if (hourIn12Format == 12)				hourIn12Format = 0;			int hourIn24Format = hourIn12Format;			if (!isAM)				hourIn24Format += 12;			if (calendar_date == null)				calendar_date = Calendar.getInstance();			calendar_date.set(calendar_date.get(Calendar.YEAR),					calendar_date.get(Calendar.MONTH),					calendar_date.get(Calendar.DAY_OF_MONTH), hourIn24Format,					minute);			is24HourView = false;		}	}	public void set24HourFormat(boolean is24HourFormat) {		is24HourView = is24HourFormat;	}	public interface ICustomDateTimeListener {		public void onSet(Calendar calendarSelected, Date dateSelected,				int year, String monthFullName, String monthShortName,				int monthNumber, int date, String weekDayFullName,				String weekDayShortName, int hour24, int hour12, int min,				int sec, String AM_PM);		public void onCancel();	}	@Override	public void onClick(View v) {		switch (v.getId()) {		case R.id.btn_set:			if (dialog.isShowing())				dialog.dismiss();			if (iCustomDateTimeListener != null) {				int month = datePicker.getMonth();				int year = datePicker.getYear();				int day = datePicker.getDayOfMonth();				calendar_date.set(year, month, day);				int hourOfDay = timePicker.getCurrentHour().intValue();				int minute = timePicker.getCurrentMinute().intValue();				calendar_date.set(year, month, day, hourOfDay, minute);				iCustomDateTimeListener.onSet(calendar_date, calendar_date						.getTime(), calendar_date.get(Calendar.YEAR),						getMonthFullName(calendar_date.get(Calendar.MONTH)),						getMonthShortName(calendar_date.get(Calendar.MONTH)),						calendar_date.get(Calendar.MONTH), calendar_date								.get(Calendar.DAY_OF_MONTH),						getWeekDayFullName(calendar_date								.get(Calendar.DAY_OF_WEEK)),						getWeekDayShortName(calendar_date								.get(Calendar.DAY_OF_WEEK)), calendar_date								.get(Calendar.HOUR_OF_DAY),						getHourIn12Format(calendar_date								.get(Calendar.HOUR_OF_DAY)), calendar_date								.get(Calendar.MINUTE), calendar_date								.get(Calendar.SECOND), getAMPM(calendar_date));			}			resetData();			break;		case R.id.btn_cancel:			if (dialog.isShowing())				dialog.dismiss();			if (iCustomDateTimeListener != null)				iCustomDateTimeListener.onCancel();			resetData();			break;		}	}	/**	 * @param date	 *            date in String	 * @param fromFormat	 *            format of your <b>date</b> eg: if your date is 2011-07-07	 *            09:09:09 then your format will be <b>yyyy-MM-dd hh:mm:ss</b>	 * @param toFormat	 *            format to which you want to convert your <b>date</b> eg: if	 *            required format is 31 July 2011 then the toFormat should be	 *            <b>d MMMM yyyy</b>	 * @return formatted date	 */	public static String convertDate(String date, String fromFormat,			String toFormat) {		String formattedDate = "";		try {			SimpleDateFormat simpleDateFormat = new SimpleDateFormat(fromFormat);			Date d = simpleDateFormat.parse(date);			Calendar calendar = Calendar.getInstance();			calendar.setTime(d);			simpleDateFormat = new SimpleDateFormat(toFormat);			simpleDateFormat.setCalendar(calendar);			formattedDate = simpleDateFormat.format(calendar.getTime());		} catch (Exception e) {			if (e != null)				e.printStackTrace();		}		return formattedDate;	}	/**	 * @param monthNumber	 *            Month Number starts with 0. For <b>January</b> it is <b>0</b>	 *            and for <b>December</b> it is <b>11</b>.	 * @return	 */	private String getMonthFullName(int monthNumber) {		String monthName = "";		if (monthNumber >= 0 && monthNumber < 12)			try {				Calendar calendar = Calendar.getInstance();				calendar.set(Calendar.MONTH, monthNumber);				SimpleDateFormat simpleDateFormat = new SimpleDateFormat("MMMM");				simpleDateFormat.setCalendar(calendar);				monthName = simpleDateFormat.format(calendar.getTime());			} catch (Exception e) {				if (e != null)					e.printStackTrace();			}		return monthName;	}	/**	 * @param monthNumber	 *            Month Number starts with 0. For <b>January</b> it is <b>0</b>	 *            and for <b>December</b> it is <b>11</b>.	 * @return	 */	private String getMonthShortName(int monthNumber) {		String monthName = "";		if (monthNumber >= 0 && monthNumber < 12)			try {				Calendar calendar = Calendar.getInstance();				calendar.set(Calendar.MONTH, monthNumber);				SimpleDateFormat simpleDateFormat = new SimpleDateFormat("MMM");				simpleDateFormat.setCalendar(calendar);				monthName = simpleDateFormat.format(calendar.getTime());			} catch (Exception e) {				if (e != null)					e.printStackTrace();			}		return monthName;	}	/**	 * @param weekDayNumber	 *            Week Number starts with 1. For <b>Sunday</b> it is <b>1</b>	 *            and for <b>Saturday</b> it is <b>7</b>.	 * @return	 */	private String getWeekDayFullName(int weekDayNumber) {		String weekName = "";		if (weekDayNumber > 0 && weekDayNumber < 8) {			try {				Calendar calendar = Calendar.getInstance();				calendar.set(Calendar.DAY_OF_WEEK, weekDayNumber);				SimpleDateFormat simpleDateFormat = new SimpleDateFormat("EEEE");				simpleDateFormat.setCalendar(calendar);				weekName = simpleDateFormat.format(calendar.getTime());			} catch (Exception e) {				if (e != null)					e.printStackTrace();			}		}		return weekName;	}	/**	 * @param weekDayNumber	 *            Week Number starts with 1. For <b>Sunday</b> it is <b>1</b>	 *            and for <b>Saturday</b> it is <b>7</b>.	 * @return	 */	private String getWeekDayShortName(int weekDayNumber) {		String weekName = "";		if (weekDayNumber > 0 && weekDayNumber < 8) {			try {				Calendar calendar = Calendar.getInstance();				calendar.set(Calendar.DAY_OF_WEEK, weekDayNumber);				SimpleDateFormat simpleDateFormat = new SimpleDateFormat("EE");				simpleDateFormat.setCalendar(calendar);				weekName = simpleDateFormat.format(calendar.getTime());			} catch (Exception e) {				if (e != null)					e.printStackTrace();			}		}		return weekName;	}	private int getHourIn12Format(int hour24) {		int hourIn12Format = 0;		if (hour24 == 0)			hourIn12Format = 12;		else if (hour24 <= 12)			hourIn12Format = hour24;		else			hourIn12Format = hour24 - 12;		return hourIn12Format;	}	private String getAMPM(Calendar calendar) {		String ampm = (calendar.get(Calendar.AM_PM) == (Calendar.AM)) ? "AM"				: "PM";		return ampm;	}	private void resetData() {		calendar_date = null;		is24HourView = true;	}	public static String pad(int i) {		return i <= 9 ? "0" + i : "" + i;	}	public static String getSecondsFromMillis(long milliseconds) {		return "" + ((int) ((milliseconds / 1000) % 60));	}	public static String getMinutesFromMillis(long milliseconds) {		return "" + (int) ((milliseconds / (1000 * 60)) % 60);	}	public static String getHoursFromMillis(long milliseconds) {		return "" + (int) ((milliseconds / (1000 * 60 * 60)) % 24);	}	/**	 * @param monthNumber	 *            Month Number starts with 0. For <b>January</b> it is <b>0</b>	 *            and for <b>December</b> it is <b>11</b>.	 * @param year	 * @return	 */	public static int getDaysInMonth(int monthNumber, int year) {		int days = 0;		if (monthNumber >= 0 && monthNumber < 12) {			try {				Calendar calendar = Calendar.getInstance();				int date = 1;				calendar.set(year, monthNumber, date);				days = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);			} catch (Exception e) {				if (e != null)					e.printStackTrace();			}		}		return days;	}	/**	 * @param monthNumber	 *            Month Number starts with 0. For <b>January</b> it is <b>0</b>	 *            and for <b>December</b> it is <b>11</b>.	 * @return	 */	public static int getDaysInMonthInPresentYear(int monthNumber) {		int days = 0;		if (monthNumber >= 0 && monthNumber < 12) {			try {				Calendar calendar = Calendar.getInstance();				int date = 1;				int year = calendar.get(Calendar.YEAR);				calendar.set(year, monthNumber, date);				days = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);			} catch (Exception e) {				if (e != null)					e.printStackTrace();			}		}		return days;	}	public static int getDaysDifference(Date fromDate, Date toDate) {		if (fromDate == null || toDate == null)			return 0;		return (int) ((toDate.getTime() - fromDate.getTime()) / (1000 * 60 * 60 * 24));	}	public static int getDaysDifference(Calendar calendar1, Calendar calendar2) {		if (calendar1 == null || calendar2 == null)			return 0;		return (int) ((calendar2.getTimeInMillis() - calendar1				.getTimeInMillis()) / (1000 * 60 * 60 * 24));	}}