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android 定时短信app之时间选择器（一）

2024-07-18 02:16:56   218人阅读

DatePicker类图

 

主要方法

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

类 TimePicker类图

setOnTimeChangedListenerpublic 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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