安卓时间拾取器(DatePicker And TimePicker)

为了让用户能够选择日期和时间，Android提供了日期、时间拾取器，分别是DatePicker组件和TimePicker组件。这两个组件使用比较简单。可以在Eclipse的可视化界面设计鹅中，选择对应的组件并拖曳到布局文件中。为了可以在程序中获取用户选择的日期、时间。还需要为〔ratePicker和TimePicker组件添加率件监听器。其中。r目已OZi组件对应的事件监听器是OnDateChanBedListener，而TimePicker组件对应的事件监听器是OnTimeChangedListener.
    下面通过一个具体的实例来说明日期、时间选择器的共体应用。

    例如在Eclipse中创建安卓 I项目，名称随意.在屏箱中添加日期、时间拾取。并实现在改变日期或时间时。通过消息提示框显示改变后的日期或时间。

1)布局文件中的关键代码:

  <DatePicker
        android:id="@+id/datepicker"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <TimePicker
        android:id="@+id/timepicker"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

2）在主活动MainActivity的onCreateO方法中，获取日期拾取组件和时间拾取组件，并将时间拾取组件设2为24小时制式显示，具休代码如下：

// 获取日期拾取器
		DatePicker datepicker = (DatePicker) findViewById(R.id.datepicker);
		//获取时间拾取组件
		TimePicker timepicker = (TimePicker) findViewById(R.id.timepicker);
		timepicker.setIs24HourView(true);

3）创建一个日历对象。井获取当前年、月、日、小时和分钟，具体代码如下：

Calendar calendar = Calendar.getInstance();
		year = calendar.get(Calendar.YEAR);
		month = calendar.get(Calendar.MONTH);
		day = calendar.get(Calendar.DAY_OF_MONTH);
		hour = calendar.get(Calendar.HOUR_OF_DAY);
		minute = calendar.get(Calendar.MINUTE);

下面贴出完整代码：

xml布局文件:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="日期时间拾取器" />

    <DatePicker
        android:id="@+id/datepicker"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <TimePicker
        android:id="@+id/timepicker"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

java代码

package com.xzy.demo.dateandtime;

import java.util.Calendar;

import android.app.Activity;
import android.os.Bundle;
import android.widget.DatePicker;
import android.widget.DatePicker.OnDateChangedListener;
import android.widget.TimePicker;
import android.widget.TimePicker.OnTimeChangedListener;
import android.widget.Toast;

public class Date_Time_pluginActivity extends Activity {
	private int year;
	private int month;
	private int day;
	private int hour;
	private int minute;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		// 获取日期拾取器
		DatePicker datepicker = (DatePicker) findViewById(R.id.datepicker);
		// 获取时间拾取组件
		TimePicker timepicker = (TimePicker) findViewById(R.id.timepicker);
		timepicker.setIs24HourView(true);

		Calendar calendar = Calendar.getInstance();
		year = calendar.get(Calendar.YEAR);
		month = calendar.get(Calendar.MONTH);
		day = calendar.get(Calendar.DAY_OF_MONTH);
		hour = calendar.get(Calendar.HOUR_OF_DAY);
		minute = calendar.get(Calendar.MINUTE);

		timepicker.setCurrentHour(hour);
		timepicker.setCurrentMinute(minute);
		// datapicker初始化
		datepicker.init(year, month, day, new OnDateChangedListener() {

			public void onDateChanged(DatePicker view, int year,
					int monthOfYear, int dayOfMonth) {
				Date_Time_pluginActivity.this.year = year;// 改变year属性的值
				Date_Time_pluginActivity.this.month = monthOfYear;// 改变month属性的值
				Date_Time_pluginActivity.this.day = dayOfMonth;// 改变day属性的值
				String date_time = year + "年" + (month + 1) + "月" + day + "日";
				Toast.makeText(Date_Time_pluginActivity.this, date_time, 2000)
						.show();
			}
		});

		timepicker.setOnTimeChangedListener(new OnTimeChangedListener() {

			public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {
				Date_Time_pluginActivity.this.hour = hourOfDay;// 改变hour属性的值
				Date_Time_pluginActivity.this.minute = minute;// 改变minute属性的值
				String time = year + "年" + (month + 1) + "月" + day + "日" + hour
						+ "时" + minute + "分";
				Toast.makeText(Date_Time_pluginActivity.this, time, 2000)
						.show();
			}
		});
	}
}

改变日期时截图:

改变时间时: