Android实用笔记——使用DataPicker和TimePicker显示当前日期和时间

 

一、事先准备：

    熟悉DatePicker和TimePicker两种实现动态输入日期和时间的功能，输入模块贴合在屏幕上；

    熟悉DatePickerDialog和TimePickerDialog两种实现动态输入日期和时间的对话框，输入模块以对话框形式出现；

 

二、针对检测日期时间改变的监听器：

    a、针对输入模块贴合在屏幕的监听器：OnDateChangedListener和OnTimeChangedListener()

        当用户更改DataPicker里的年月日时，将触发OnDateChangedListener监听器的onDateChange()事件；

        当用户更改了TimePicker里的时分时，将触发OnTimeChangedListener()的onTimeChanged()事件；

    b、针对输入模块以对话框形式出现的监听器：OnDateSetListener和OnTimeSetListener()

        当用户更改DataPickerDialog里的年月日时，将触发OnDateSetListener监听器的onDateSet()事件；

        当用户更改TimePickerDialog里的时分时，将触发OnTimeSetListener监听器的onTimeSet()事件；

 

三、样例需求功能描述：

    默认在标题栏中展现当前日期和时间，经过监听器去获取用户选择日期或时间的结果，并将变动的日期或时间展现在标题栏上。

    利用setTitle去改变标题栏内容。

 

四、使用DataPicker实现日历选择器，使用TimePicker实现时间选择器：

    建立main.xml文件，设置其布局为：

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

    <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>

    修改MainActivity.java文件

package com.example.myandroiddatapickerandtimepicker;

import java.util.Calendar;

import android.os.Bundle;
import android.R.integer;
import android.app.Activity;
import android.view.Menu;
import android.widget.CalendarView;
import android.widget.DatePicker;
import android.widget.DatePicker.OnDateChangedListener;
import android.widget.TimePicker;
import android.widget.TimePicker.OnTimeChangedListener;

public class MainActivity extends Activity {
	//定义
	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;//从0开始计算月份
        day=cal.get(Calendar.DAY_OF_MONTH);
        hour=cal.get(Calendar.HOUR_OF_DAY);
        minute=cal.get(Calendar.MINUTE);
        
        //显示在标题栏
        setTitle(year+"-"+month+"-"+day+"-"+hour+":"+minute);
        
        //用findById方法将布局文件和变量进行绑定
        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() {
			
			@Override
			public void onDateChanged(DatePicker view, int year, int monthOfYear, int dayofMonth) {
				// TODO Auto-generated method stub
				setTitle(year+"-"+monthOfYear+1+"-"+dayofMonth);
			}
		});
        
        timePicker.setOnTimeChangedListener(new OnTimeChangedListener() {
			
			@Override
			public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {
				// TODO Auto-generated method stub
				setTitle(hourOfDay+":"+minute);
			}
		});
    }

}

    这样选择的日期、时间将动态刷新到标题栏

 

五、使用DataPickerDialog实现日历选择器，使用TimePickerDialog实现时间选择器：

     修改上述MainActivity.java文件

package com.example.myandroiddatapickerandtimepicker;

import java.util.Calendar;

import android.os.Bundle;
import android.R.integer;
import android.app.Activity;
import android.app.DatePickerDialog;
import android.app.DatePickerDialog.OnDateSetListener;
import android.app.TimePickerDialog;
import android.app.TimePickerDialog.OnTimeSetListener;
import android.view.Menu;
import android.widget.CalendarView;
import android.widget.DatePicker;
import android.widget.DatePicker.OnDateChangedListener;
import android.widget.TimePicker;
import android.widget.TimePicker.OnTimeChangedListener;

public class MainActivity extends Activity {
	//定义
	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;//从0开始计算月份
        day=cal.get(Calendar.DAY_OF_MONTH);
        hour=cal.get(Calendar.HOUR_OF_DAY);
        minute=cal.get(Calendar.MINUTE);
        
        //显示在标题栏
        setTitle(year+"-"+month+"-"+day+"-"+hour+":"+minute);
        
        //DatePickerDialog的初始化
        /*new DatePickerDialog(this, new OnDateSetListener() {
			
			@Override
			public 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();*/
        
        new TimePickerDialog(this, new OnTimeSetListener() {
			
			@Override
			public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
				// TODO Auto-generated method stub
				setTitle(hourOfDay+":"+minute);
			}
		}, hour, minute, true).show();
    }

}