Completely refer to the source code of the system’s own DatePickerDialog and timepickerdialog, and copy the datetimepickerdialog

Completely refer to the datetimepickerdialog copied from the source code of the system's own DatePickerDialog and timepickerdialog. It has the function of selecting date and time at the same time. On 2.2 and 2.3 platforms, the display effect may have a large background box behind it. There is no such phenomenon on platforms above 4.0. This strange effect cannot be solved by various means. The function does not affect normal use.

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);
    }
}

Reproduced at: https://www.cnblogs.com/AsionTang/p/3569695.html