使用DatePicker以及TimePicker显示当前日期和时间

package com.example.datetimepicker;

import java.util.Calendar;

import android.app.Activity;
import android.app.DatePickerDialog;
import android.app.DatePickerDialog.OnDateSetListener;
import android.app.TimePickerDialog;
import android.app.TimePickerDialog.OnTimeSetListener;
import android.os.Bundle;
import android.widget.DatePicker;
import android.widget.DatePicker.OnDateChangedListener;
import android.widget.TimePicker;
import android.widget.TimePicker.OnTimeChangedListener;

public class MainActivity extends Activity {
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.main);
//获取日历的一个对象
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;//一月是从0开始计算的，所以要+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+"-"+(month)+1+"-"+day+"-"+hour+":"+minute);
}
});
timepicker.setOnTimeChangedListener(new OnTimeChangedListener() {

@Override
public void onTimeChanged(TimePicker view, int hourofday, int minute) {
// TODO Auto-generated method stub
setTitle(hourofday+":"+minute);
}
});
new DatePickerDialog(this, new OnDateSetListener() {

@Override
public void onDateSet(DatePicker view, int year, int monthofyear, int dayofmonth) {
// TODO Auto-generated method stub
setTitle(year+"-"+(monthofyear+1)+"-"+dayofmonth);

}
}, year, cal.get(Calendar.MONTH), day).show();//对话框显示

new TimePickerDialog(this, new OnTimeSetListener() {

@Override
public void onTimeSet(TimePicker arg0, int hourofday, int minute) {
// TODO Auto-generated method stub
setTitle(hourofday+":"+minute);
}
}, hour, minute, true).show();

}
}