Android控件之DatePicker、TimePicker探究

一、DatePicker繼承自FrameLayout類，日期選擇控件的主要功能是向用戶提供包含年、月、日的日期數據並允許用戶對其修改。如果要捕獲用戶修改日期選擇控件中的數據事件，需要爲DatePicker添加OnDateChangedListener監聽器。

二、TimePicker也繼承自FrameLayout類。時間選擇控件向用戶顯示一天中的時間（可以爲24小時，也可以爲AM/PM制），並允許用戶進行選擇。如果要捕獲用戶修改時間數據的事件，便需要爲TimePicker添加OnTimeChangedListener監聽器

以下模擬日期與時間選擇控件的用法

main.xml佈局文件

<?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類

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);
			}
		});
	}
}