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程序跟老師講的一樣，編譯也沒錯誤，運行的時候初始化也正確。但是點擊日歷變化日期后，標題上的日期不會跟著變化，不知道是哪里有問題。

package com.example.datetimepicker;

import java.util.Calendar;

import android.support.v7.app.ActionBarActivity;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.widget.DatePicker;

import android.widget.DatePicker.OnDateChangedListener;

import android.widget.TimePicker;

public class MainActivity extends ActionBarActivity {

private TimePicker timePicker;

private DatePicker datePicker;

private Calendar cal;

private int year;

private int month;

private int day;

private int hour;

private int minute;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

//獲取日歷的對象

cal=Calendar.getInstance();

//獲取年月日時分秒的信息

year=cal.get(Calendar.YEAR);

month=cal.get(Calendar.MONTH)+1;

day=cal.get(Calendar.DAY_OF_MONTH);

hour=cal.get(Calendar.HOUR_OF_DAY);

minute=cal.get(Calendar.MINUTE);

setTitle(year+"-"+month+"-"+day+"-"+hour+":"+minute);

? ?datePicker=(DatePicker) findViewById( R.id.datePicker);

? ?timePicker=(TimePicker) findViewById(R.id.timePicker);

? ?//datePicker 初始化

? ?datePicker.init(year, cal.get(Calendar.MONTH), day,new OnDateChangedListener() {

@Override

public void onDateChanged(DatePicker view, int year, int monthOfYear,

int dayOfMonth) {

// TODO Auto-generated method stub

setTitle(year+"-"+(monthOfYear+1)+"-"+dayOfMonth);

}

});

}

}