程序跟老师讲的一样，编译也没错误，运行的时候初始化也正确。但是点击日历变化日期后，标题上的日期不会跟着变化，不知道是哪里有问题。
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);
//获取日历的对象
cal=Calendar.getInstance();
//获取年月日时分秒的信息
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);
}
});
}
}
