Android控件之DatePicker、TimePicker探究

一、DatePicker继承自FrameLayout类，日期选择控件的主要功能是向用户提供包含年、月、日的日期数据并允许用户对其修改。如果要捕获用户修改日期选择控件中的数据事件，需要为DatePicker添加OnDateChangedListener监听器。

二、TimePicker也继承自FrameLayout类。时间选择控件向用户显示一天中的时间（可以为24小时，也可以为AM/PM制），并允许用户进行选择。如果要捕获用户修改时间数据的事件，便需要为TimePicker添加OnTimeChangedListener监听器

以下模拟日期与时间选择控件的用法

main.xml布局文件

<?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">
	<DatePicker android:id="@+id/datePicker"
		android:layout_width="wrap_content" android:layout_height="wrap_content"
		android:layout_gravity="center_horizontal"></DatePicker>
	<EditText android:id="@+id/dateEdit" android:layout_width="fill_parent"
		android:layout_height="wrap_content" android:cursorVisible="false"
		android:editable="false"></EditText>
	<TimePicker android:id="@+id/timePicker"
		android:layout_width="wrap_content" android:layout_height="wrap_content"
		android:layout_gravity="center_horizontal"></TimePicker>
	<EditText android:id="@+id/timeEdit" android:layout_width="fill_parent"
		android:layout_height="wrap_content" android:cursorVisible="false"
		android:editable="false"></EditText>
</LinearLayout>

AndroidDateControlActivity类

package com.shimly.activity;

import java.util.Calendar;

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

public class AndroidDateControlActivity extends Activity {

	private EditText dateEdit = null;
	private EditText timeEdit = null;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		dateEdit = (EditText) findViewById(R.id.dateEdit);
		timeEdit = (EditText) findViewById(R.id.timeEdit);

		DatePicker datePicker = (DatePicker) findViewById(R.id.datePicker);
		TimePicker timePicker = (TimePicker) findViewById(R.id.timePicker);

		Calendar calendar = Calendar.getInstance();
		int year = calendar.get(Calendar.YEAR);
		int month = calendar.get(Calendar.MONTH);
		int day = calendar.get(Calendar.DAY_OF_MONTH);

		datePicker.init(year, month, day, new OnDateChangedListener() {

			public void onDateChanged(DatePicker view, int year,
					int monthOfYear, int dayOfMonth) {
				dateEdit.setText(year + "/" + (monthOfYear + 1) + "/"
						+ dayOfMonth);
			}
		});

		timePicker.setOnTimeChangedListener(new OnTimeChangedListener() {
			public void onTimeChanged(TimePicker view,int hourOfDay,int minute){
				timeEdit.setText(hourOfDay+":"+minute);
			}
		});
	}
}