Android---UI篇---DatePicker,TimePicker（日期和时间）

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日期和时间是任何手机平台都有的功能，Android也如此。
DatePicker：用来实现日期（年月日）
TimePicker：用来实现时间（时分秒）

Calendar：日历是设定年度日期对象和一个整数字段之间转换的抽象基类，如，月，日，小时等。
例如
final Calendar calendar=Calendar.getInstance();
  mYear=calendar.get(Calendar.YEAR);---获取年份
  mMonth=calendar.get(Calendar.MONTH);---获取月份
  mDay=calendar.get(Calendar.DAY_OF_MONTH);---获取日
  mHour=calendar.get(Calendar.HOUR_OF_DAY);---获取时
  mMinute=calendar.get(Calendar.MINUTE);---获取分
等等，可以参考API文档
TimePickerDialog、DatePickerDialog是对话框形式的时间类。

废话不多说，实例如下：
DateTest.java文件

package org.loulijun.datetest;import java.util.Calendar;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 DateTest extends Activity {    /** Called when the activity is first created. */        TextView textview;        TimePicker timepicker;        DatePicker datepicker;        Button btn1;        Button btn2;        //JAVA中的Calendar类        Calendar c;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        /*Like other locale-sensitive classes, Calendar provides a class method, getInstance,         *for getting a default instance of this class for general use.         *Calendar's getInstance method returns a calendar whose locale is based on system settings         *and whose time fields have been initialized with the current date and time:        */        c=Calendar.getInstance();        textview=(TextView)findViewById(R.id.textview);        btn1=(Button)findViewById(R.id.button1);        btn2=(Button)findViewById(R.id.button2);                //获取DatePicker对象        datepicker=(DatePicker)findViewById(R.id.datepicker1);        //将日历初始化为当前系统时间，并设置其事件监听        datepicker.init(c.get(Calendar.YEAR),c.get(Calendar.MONTH),c.get(Calendar.DAY_OF_MONTH),                        new DatePicker.OnDateChangedListener() {                                                                                @Override                                        public void onDateChanged(DatePicker view, int year, int monthOfYear,                                                        int dayOfMonth) {                                                // TODO Auto-generated method stub                                                //当前日期更改时，在这里设置                                                c.set(year,monthOfYear,dayOfMonth);                                        }                                });        //获取TimePicker对象        timepicker=(TimePicker)findViewById(R.id.timepicker1);        //设置为24小时制显示时间        timepicker.setIs24HourView(true);        //监听时间改变        timepicker.setOnTimeChangedListener(new TimePicker.OnTimeChangedListener() {                                                @Override                        public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {                                // TODO Auto-generated method stub                                //时间改变处理                                //c.set(year,month,hourOfDay,minute,second);                        }                });                btn1.setOnClickListener(new Button.OnClickListener()        {                        @Override                        public void onClick(View v) {                                // TODO Auto-generated method stub                                new DatePickerDialog(DateTest.this,                                                new DatePickerDialog.OnDateSetListener() {                                                                                                                @Override                                                        public void onDateSet(DatePicker view, int year, int monthOfYear,                                                                        int dayOfMonth) {                                                                        //设置日历                                                                }                                                },c.get(Calendar.YEAR),c.get(Calendar.MONTH),c.get(Calendar.DAY_OF_MONTH)).show();                        }        });                btn2.setOnClickListener(new Button.OnClickListener()        {                        @Override                        public void onClick(View v) {                                // TODO Auto-generated method stub                                new TimePickerDialog(DateTest.this,                                                new TimePickerDialog.OnTimeSetListener() {                                                                                                                @Override                                                        public void onTimeSet(TimePicker view, int hourOfDay, int minute) {                                                                // TODO Auto-generated method stub                                                                //设置时间                                                        }                                                },c.get(Calendar.HOUR_OF_DAY),c.get(Calendar.MINUTE),true).show();                        }                        });    }}

main.xml文件

<?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/textview"    android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:text="时间控件使用"    /><DatePicker        android:id="@+id/datepicker1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"/><TimePicker        android:id="@+id/timepicker1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"/><Button        android:id="@+id/button1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="设置日期"        android:layout_gravity="center"/><Button        android:id="@+id/button2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="设置时间"        android:layout_gravity="center"/></LinearLayout>

运行结果如下：

当点击“设置日期”按钮后，就会显示如下对话框样式的DatePickerDialog

当点击“设置时间”按钮后，就会弹出如下对话框样式的TimePickerDialog

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