<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:Android="http://schemas.android.com/apk/res/android"
 Android:orientation="vertical"
 Android:layout_width="fill_parent"
 Android:layout_height="fill_parent"
 >
<TextView Android:id="@+id/dateAndTime"
 Android:layout_width="fill_parent"
 Android:layout_height="wrap_content"
 Android:text="@string/hello"
 />
<Button
 Android:id="@+id/setDate"
 Android:layout_width="fill_parent"
 Android:layout_height="wrap_content"
 Android:text="Set the Date"></Button>
<Button Android:id="@+id/setTime"
 Android:layout_width="fill_parent"
 Android:layout_height="wrap_content"
 Android:text="Set the Time"></Button>
</LinearLayout>

package yyl.Android;
import java.text.DateFormat;
import java.util.Calendar;
import java.util.Locale;
import Android.app.Activity;
import Android.app.DatePickerDialog;
import Android.app.TimePickerDialog;
import Android.os.Bundle;
import Android.view.View;
import Android.widget.Button;
import Android.widget.DatePicker;
import Android.widget.TextView;
import Android.widget.TimePicker;
public class ChronoDemo extends Activity {
 //获取日期格式器对象
 DateFormat fmtDateAndTime = DateFormat.getDateTimeInstance();
 //定义一个TextView控件对象
 TextView dateAndTimeLabel = null;
 //获取一个日历对象
 Calendar dateAndTime = Calendar.getInstance(Locale.CHINA);
 //当点击DatePickerDialog控件的设置按钮时，调用该方法
 DatePickerDialog.OnDateSetListener d = new DatePickerDialog.OnDateSetListener()
 {
 @Override
 public void onDateSet(DatePicker view, int year, int monthOfYear,int dayOfMonth) {
  //修改日历控件的年，月，日
  //这里的year,monthOfYear,dayOfMonth的值与DatePickerDialog控件设置的最新值一致
  dateAndTime.set(Calendar.YEAR, year);
  dateAndTime.set(Calendar.MONTH, monthOfYear);
  dateAndTime.set(Calendar.DAY_OF_MONTH, dayOfMonth); 
  //将页面TextView的显示更新为最新时间
  updateLabel();  
 } 
 };
 TimePickerDialog.OnTimeSetListener t = new TimePickerDialog.OnTimeSetListener() {
 //同DatePickerDialog控件
 @Override
 public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
  dateAndTime.set(Calendar.HOUR_OF_DAY, hourOfDay);
  dateAndTime.set(Calendar.MINUTE, minute);
  updateLabel();
 }
 };
 @Override
 public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.main);
 //得到页面设定日期的按钮控件对象
 Button dateBtn = (Button)findViewById(R.id.setDate);
 //设置按钮的点击事件监听器
 dateBtn.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View v) {
  //生成一个DatePickerDialog对象，并显示。显示的DatePickerDialog控件可以选择年月日，并设置
  new DatePickerDialog(ChronoDemo.this,
   d,
   dateAndTime.get(Calendar.YEAR),
   dateAndTime.get(Calendar.MONTH),
   dateAndTime.get(Calendar.DAY_OF_MONTH)).show();
  }
 });
 Button timeBtn = (Button)findViewById(R.id.setTime);
 timeBtn.setOnClickListener(new View.OnClickListener() {
  //同上原理
  @Override
  public void onClick(View v) {
  new TimePickerDialog(ChronoDemo.this,
   t,
   dateAndTime.get(Calendar.HOUR_OF_DAY),
   dateAndTime.get(Calendar.MINUTE),
   true).show();
  }
 });
 dateAndTimeLabel=(TextView)findViewById(R.id.dateAndTime);
 updateLabel();
 }
 //更新页面TextView的方法
 private void updateLabel() {
 dateAndTimeLabel.setText(fmtDateAndTime
 .format(dateAndTime.getTime()));
 }
}