完全参照系统自带的DatePickerDialog、TimePickerDialog的源代码仿写的DateTimePickerDialog

完全参照系统自带的DatePickerDialog、TimePickerDialog的源代码仿写的DateTimePickerDialog。具有同时选择日期、时间的功能。
在2.2、2.3平台，显示的效果可能会有一个大背景框在后面。4.0以上平台无此现象。此怪异效果通过各种手段未能解决。功能不影响正常使用。

import java.util.Calendar;

import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;
import android.text.format.DateUtils;
import android.view.Gravity;
import android.view.ViewGroup.LayoutParams;
import android.widget.DatePicker;
import android.widget.DatePicker.OnDateChangedListener;
import android.widget.LinearLayout;
import android.widget.TimePicker;
import android.widget.TimePicker.OnTimeChangedListener;

/**
 * 完全参照系统自带的DatePickerDialog、TimePickerDialog的源代码仿写的DateTimePickerDialog。具有同时选择日期、时间的功能。<br>
 * 在2.2、2.3平台，显示的效果可能会有一个大背景框在后面。4.0以上平台无此现象。怪异的原因未能解决。
 * @author AsionTang
 * @since 2014年2月26日 17:02:24
 */
public class DateTimePickerDialog extends AlertDialog implements OnClickListener, OnDateChangedListener, OnTimeChangedListener
{
    private final OnDateTimeChangedListener mCallback;

    private final DatePicker mDatePicker;

    private final TimePicker mTimePicker;

    private static final String HOUR = "hour";

    private static final String MINUTE = "minute";

    private static final String IS_24_HOUR = "is24hour";

    private static final String YEAR = "year";

    private static final String MONTH = "month";

    private static final String DAY = "day";

    private final Calendar mCalendar;

    public DateTimePickerDialog(final Context context, final int theme, final OnDateTimeChangedListener callBack)
    {
    super(context, theme);
    this.mCallback = callBack;
    this.mCalendar = Calendar.getInstance();
    this.updateTitle();

    this.setButton(BUTTON_POSITIVE, context.getText(android.R.string.ok), this);
    this.setButton(BUTTON_NEGATIVE, context.getText(android.R.string.cancel), (OnClickListener) null);

    this.mDatePicker = new DatePicker(context);
    this.mDatePicker.init(this.mCalendar.get(Calendar.YEAR), this.mCalendar.get(Calendar.MONTH), this.mCalendar.get(Calendar.DAY_OF_MONTH), this);

    this.mTimePicker = new TimePicker(context);
    this.mTimePicker.setIs24HourView(true);
    this.mTimePicker.setCurrentHour(this.mCalendar.get(Calendar.HOUR_OF_DAY));
    this.mTimePicker.setCurrentMinute(this.mCalendar.get(Calendar.MINUTE));
    this.mTimePicker.setOnTimeChangedListener(this);

    final LinearLayout linearLayout = new LinearLayout(context);
    linearLayout.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
    linearLayout.setOrientation(LinearLayout.VERTICAL);//默认为HORIZONTAL(水平)
    linearLayout.setGravity(Gravity.CENTER);
    linearLayout.addView(this.mDatePicker);
    linearLayout.addView(this.mTimePicker);
    this.setView(linearLayout);
    }

    public DateTimePickerDialog(final Context context, final OnDateTimeChangedListener callBack)
    {
    this(context, 0, callBack);
    }

    /**
     * Gets the {@link DatePicker} contained in this dialog.
     *
     * @return The DatePicker view.
     */
    public DatePicker getDatePicker()
    {
    return this.mDatePicker;
    }

    /**
     * Gets the {@link TimePicker} contained in this dialog.
     *
     * @return The TimePicker view.
     */
    public TimePicker getTimePicker()
    {
    return this.mTimePicker;
    }

    @Override
    public void onClick(final DialogInterface dialog, final int which)
    {
    this.tryNotifyDateTimeSet();
    }

    @Override
    public void onDateChanged(final DatePicker view, final int year, final int month, final int day)
    {
    this.mDatePicker.init(year, month, day, this);

    this.mCalendar.set(Calendar.YEAR, year);
    this.mCalendar.set(Calendar.MONTH, month);
    this.mCalendar.set(Calendar.DAY_OF_MONTH, day);

    this.updateTitle();
    }

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

    final int hour = savedInstanceState.getInt(HOUR);
    final int minute = savedInstanceState.getInt(MINUTE);
    this.mTimePicker.setIs24HourView(savedInstanceState.getBoolean(IS_24_HOUR));
    this.mTimePicker.setCurrentHour(hour);
    this.mTimePicker.setCurrentMinute(minute);
    }

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

    state.putInt(HOUR, this.mTimePicker.getCurrentHour());
    state.putInt(MINUTE, this.mTimePicker.getCurrentMinute());
    state.putBoolean(IS_24_HOUR, this.mTimePicker.is24HourView());

    return state;
    }

    @Override
    public void onTimeChanged(final TimePicker view, final int hourOfDay, final int minute)
    {
    this.mCalendar.set(Calendar.HOUR_OF_DAY, hourOfDay);
    this.mCalendar.set(Calendar.MINUTE, minute);
    }

    public void setDate(final int year, final int monthOfYear, final int dayOfMonth)
    {
    this.mDatePicker.updateDate(year, monthOfYear, dayOfMonth);
    }

    public void setDateAndTime(final int year, final int monthOfYear, final int dayOfMonth, final int hour, final int minute,
        final boolean is24HourView)
    {
    this.setDate(year, monthOfYear, dayOfMonth);
    this.setTime(hour, minute, is24HourView);
    }

    public void setTime(final int hour, final int minute, final boolean is24HourView)
    {
    this.mTimePicker.setIs24HourView(is24HourView);
    this.mTimePicker.setCurrentHour(hour);
    this.mTimePicker.setCurrentMinute(minute);
    }

    private void tryNotifyDateTimeSet()
    {
    if (this.mCallback != null)
    {
        this.mDatePicker.clearFocus();
        this.mTimePicker.clearFocus();
        this.mCallback.onDateTimeChanged(this.mDatePicker, this.mTimePicker//
            , this.mDatePicker.getYear(), this.mDatePicker.getMonth(), this.mDatePicker.getDayOfMonth()//
            , this.mTimePicker.getCurrentHour(), this.mTimePicker.getCurrentMinute());
    }
    }

    private void updateTitle()
    {
    final String title = DateUtils.formatDateTime(this.getContext(), this.mCalendar.getTimeInMillis()//
        , DateUtils.FORMAT_SHOW_DATE//
            | DateUtils.FORMAT_NO_YEAR//
            | DateUtils.FORMAT_SHOW_WEEKDAY);
    this.setTitle(title);
    }

    public interface OnDateTimeChangedListener
    {
    void onDateTimeChanged(DatePicker dateView, TimePicker timeView, int year, int monthOfYear, int dayOfMonth, int hourOfDay, int minute);
    }
}