android 定时短信app之时间选择器（一）

DatePicker类图

主要方法

public void init(int year,
                 int monthOfYear,
                 int dayOfMonth,
                 DatePicker.OnDateChangedListener onDateChangedListener)

类 TimePicker类图

setOnTimeChangedListener

public void setOnTimeChangedListener(TimePicker.OnTimeChangedListener onTimeChangedListener)

本文主要实现一个DatePicker和TimePicker组合使用的时间选择器，为后续短信的定时发送时间做伏笔。

话不多说，上代码。

先看main.xml文件

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >


    
    <Button
        android:id="@+id/dateButton"
        android:layout_width="match_parent"
        android:layout_height="40dip"
        android:layout_marginTop="20dip"
        android:text="year-month-day"
        android:textSize="18dip"
        android:background="@drawable/bg"
        android:onClick="pickSendDate"
        />
    
    <Button
        android:id="@+id/timeButton"
        android:layout_below="@id/dateButton"
        android:layout_width="match_parent"
        android:layout_height="40dip"
        android:layout_marginTop="1dip"
        android:text="hour:minute"
        android:textSize="18dip"
        android:background="@drawable/bg"
        android:onClick="pickSendTime"
        />
    
    <DatePicker
        android:id="@+id/datePicker"
        android:layout_below="@id/timeButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="20dp"
        android:startYear="2014"
        android:endYear="2020"
        android:visibility="gone"
        />
        
    <TimePicker
        android:id="@+id/timePicker"
        android:layout_below="@id/timeButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="20dp" 
        android:visibility="gone"
        />

</RelativeLayout>

整体采用相对布局，注意要想使控件水平居中时使用 android:layout_centerHorizontal="true"。而非android:layout_gravity="center_vertical"(LinearLayout布局下此种方式才有效)。DatePicker可以设置最小和最大年限，十分方便。对于Button控件的监听没有采用代码中setOnclickButtonListener，直接使用android:onClick,后边跟方法名。（两种方式均可）

代码中存在硬编码，实际项目中要注意，这里请无视。

主界面MainActivity

MainActivity.java

package com.beny.pickdate;

import java.text.SimpleDateFormat;
import java.util.Date;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.DatePicker.OnDateChangedListener;//监听日期变化
import android.widget.TimePicker;
import android.widget.TimePicker.OnTimeChangedListener;//监听时间变化

public class MainActivity extends Activity {
    
    private int year;
    private int month;
    private int day;
    private int hour;
    private int minute;
    
    private TimePicker timePicker = null;
    private DatePicker datePicker = null;
    private Button timeButton = null;
    private Button dateButton = null;
    protected String[] time = null;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        timeButton = (Button)findViewById(R.id.timeButton);
        dateButton = (Button)findViewById(R.id.dateButton);
        
        timePicker = (TimePicker)findViewById(R.id.timePicker);
        timePicker.setIs24HourView(true);
        //设定默认时间为当前系统时间
        /*也可以用TimePicker的getCurrentHour()和getCurrentMinute()方法  获得当前时间*/
        time = getCurrentTime();
        timePicker.setCurrentHour(Integer.valueOf(time[0]));
        timePicker.setCurrentMinute(Integer.valueOf(time[1]));
        
        
        //设置日期
        datePicker = (DatePicker)findViewById(R.id.datePicker);
        datePicker.setCalendarViewShown(false);
        
        //设置button上的默认日期时间
        timeButton.setText(timePicker.getCurrentHour()+":"+timePicker.getCurrentMinute());
        dateButton.setText(datePicker.getYear()+"年"+(datePicker.getMonth()+1)+"月"+datePicker.getDayOfMonth()+"日");
        
        //设置日期选择器 默认可见
        datePicker.setVisibility(View.VISIBLE);
        dateButton.setBackgroundResource(R.color.button_pressed_bg);
        
        //设置监听器
        timePicker.setOnTimeChangedListener(new SendTimeChangedListener());
        datePicker.init(datePicker.getYear(), datePicker.getMonth()+1, datePicker.getDayOfMonth(), new SendDateChangedListener());
    }

    
    public String[] getCurrentTime(){
        //取得当前的hour minute即可
        SimpleDateFormat curTimeFormat = new SimpleDateFormat("HH-mm");       
        String curTime = curTimeFormat.format(new Date());
        String[] time = new String[2];
        time = curTime.split("-");
        return time;
    }
    
    public  String[] getCurrentDate(){
        //取得当前日期的年月日
        SimpleDateFormat curDateFormat = new SimpleDateFormat("yyyy-MM-dd");       
        String curDate = curDateFormat.format(new Date());
        String[] date = new String[3];
        date = curDate.split("-");
        return date;
    }
    
    public void pickSendDate(View view){
        datePicker.setVisibility(View.VISIBLE);
        timePicker.setVisibility(View.INVISIBLE);
        timeButton.setBackgroundResource(R.color.button_bg);
        dateButton.setBackgroundResource(R.color.button_pressed_bg);
    }
    
    public void pickSendTime(View view){
        datePicker.setVisibility(View.INVISIBLE);
        timePicker.setVisibility(View.VISIBLE);
        timeButton.setBackgroundResource(R.color.button_pressed_bg);
        dateButton.setBackgroundResource(R.color.button_bg);
    }
    
    //TODO
    //设定日期是否早于当前日期
    private boolean isBeforeCurDate(){
        return false;
    }
    
    //TODO
    //设定时间是否早于当前时间
    private boolean isBeforeCurTime(){
        return false;
    }


    class SendTimeChangedListener implements OnTimeChangedListener{

        @Override
        public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {
            timeButton.setText(hourOfDay+":"+minute);
            MainActivity.this.hour = hourOfDay;
            MainActivity.this.minute = minute;
        }        
    }

    class SendDateChangedListener implements OnDateChangedListener{

        @Override
        public void onDateChanged(DatePicker view, int year, int month, int day) {
            dateButton.setText(year+"年"+(month+1)+"月"+day+"日");
            MainActivity.this.year = year;
            MainActivity.this.month = month;
            MainActivity.this.day = day;
        }
    }
    
    //创建菜单
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

}

有个要注意的地方，就是month月份要加1，否则月份不对。

color.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="button_pressed_bg">#DD5D04</color>
    <color name="button_bg">#F7F7F7</color>
</resources>

bg.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
    <item android:state_pressed="true"
        android:drawable="@color/button_pressed_bg"
        />
    <item
        android:drawable="@color/button_bg"
        />

</selector>

效果图

1.默认状态下效果图，默认选中日期按钮，显示DatePicker视图，默认加载系统当前日期。

2.点击时间按钮控件，视图切换到TimePicker，默认也是加载进入时系统时间。

3.上下选择日期或者时间，日期Button控件或时间Button控件中的文字信息会随之改变，这得益于给控件设置监听器后复写了其onDateChanged(DatePicker view, int year, int month, int day) 和onTimeChanged(TimePicker view, int hourOfDay, int minute)方法。

　

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