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() {@Overridepublic 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() {@Overridepublic void onTimeChanged(TimePicker view, int hourofday, int minute) {// TODO Auto-generated method stubsetTitle(hourofday+":"+minute);}});        new DatePickerDialog(this, new OnDateSetListener() {@Overridepublic 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() {@Overridepublic void onTimeSet(TimePicker arg0, int hourofday, int minute) {// TODO Auto-generated method stubsetTitle(hourofday+":"+minute);}}, hour, minute, true).show();                    }}
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