android实现双日期选择控件（可隐藏日，只显示年月）
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2023-12-21 08:10:04
在安卓开发中，会碰到选开始日期和结束日期的问题。特别是在使用pad时，如果弹出一个dialog，能够同时选择开始日期和结束日期，那将是极好的。我在开发中在datepicke...
在安卓开发中，会碰到选开始日期和结束日期的问题。特别是在使用pad时，如果弹出一个dialog，能够同时选择开始日期和结束日期，那将是极好的。我在开发中在datepickerdialog的基础上做了修改，实现了这种dialog。效果如下：
具体实现方法为：
先新建一个安卓项目doubledatepicker，在res/layout文件夹下新建date_picker_dialog.xml，内容如下：
<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:orientation="horizontal"
android:paddingtop="10dp" >
<linearlayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:orientation="vertical"
android:padding="5dip" >
<textview
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="开始日期" />
<datepicker
android:id="@+id/datepickerstart"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:calendarviewshown="false" />
</linearlayout>
<imageview
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:src="@drawable/fenge" />
<linearlayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:orientation="vertical"
android:padding="5dip" >
<textview
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="结束日期" />
<datepicker
android:id="@+id/datepickerend"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:calendarviewshown="false" />
</linearlayout>
</linearlayout>
然后，在src的 默认包下新建文件doubledatepickerdialog.java，内容如下：
/*
* copyright (c) 2007 the android open source project
*
* licensed under the apache license, version 2.0 (the "license");
* you may not use this file except in compliance with the license.
* you may obtain a copy of the license at
*
*
* unless required by applicable law or agreed to in writing, software
* distributed under the license is distributed on an "as is" basis,
* without warranties or conditions of any kind, either express or implied.
* see the license for the specific language governing permissions and
* limitations under the license.
*/
package com.example.doubledatepicker;
import java.lang.reflect.field;
import android.app.alertdialog;
import android.content.context;
import android.content.dialoginterface;
import android.content.dialoginterface.onclicklistener;
import android.os.bundle;
import android.view.layoutinflater;
import android.view.view;
import android.widget.datepicker;
import android.widget.datepicker.ondatechangedlistener;
/**
* a simple dialog containing an {@link android.widget.datepicker}.
*
* <p>
* see the <a href="{@docroot}guide/topics/ui/controls/pickers.html">pickers</a>
* guide.
* </p>
*/
public class doubledatepickerdialog extends alertdialog implements onclicklistener, ondatechangedlistener {
private static final string start_year = "start_year";
private static final string end_year = "end_year";
private static final string start_month = "start_month";
private static final string end_month = "end_month";
private static final string start_day = "start_day";
private static final string end_day = "end_day";
private final datepicker mdatepicker_start;
private final datepicker mdatepicker_end;
private final ondatesetlistener mcallback;
/**
* the callback used to indicate the user is done filling in the date.
*/
public interface ondatesetlistener {
/**
* @param view
* the view associated with this listener.
* @param year
* the year that was set.
* @param monthofyear
* the month that was set (0-11) for compatibility with
* {@link java.util.calendar}.
* @param dayofmonth
* the day of the month that was set.
*/
void ondateset(datepicker startdatepicker, int startyear, int startmonthofyear, int startdayofmonth,
datepicker enddatepicker, int endyear, int endmonthofyear, int enddayofmonth);
}
/**
* @param context
* the context the dialog is to run in.
* @param callback
* how the parent is notified that the date is set.
* @param year
* the initial year of the dialog.
* @param monthofyear
* the initial month of the dialog.
* @param dayofmonth
* the initial day of the dialog.
*/
public doubledatepickerdialog(context context, ondatesetlistener callback, int year, int monthofyear, int dayofmonth) {
this(context, 0, callback, year, monthofyear, dayofmonth);
}
public doubledatepickerdialog(context context, int theme, ondatesetlistener callback, int year, int monthofyear,
int dayofmonth) {
this(context, 0, callback, year, monthofyear, dayofmonth, true);
}
/**
* @param context
* the context the dialog is to run in.
* @param theme
* the theme to apply to this dialog
* @param callback
* how the parent is notified that the date is set.
* @param year
* the initial year of the dialog.
* @param monthofyear
* the initial month of the dialog.
* @param dayofmonth
* the initial day of the dialog.
*/
public doubledatepickerdialog(context context, int theme, ondatesetlistener callback, int year, int monthofyear,
int dayofmonth, boolean isdayvisible) {
super(context, theme);
mcallback = callback;
context themecontext = getcontext();
setbutton(button_positive, "确 定", this);
setbutton(button_negative, "取 消", this);
// setbutton(button_positive,
// themecontext.gettext(android.r.string.date_time_done), this);
seticon(0);
layoutinflater inflater = (layoutinflater) themecontext.getsystemservice(context.layout_inflater_service);
view view = inflater.inflate(r.layout.date_picker_dialog, null);
setview(view);
mdatepicker_start = (datepicker) view.findviewbyid(r.id.datepickerstart);
mdatepicker_end = (datepicker) view.findviewbyid(r.id.datepickerend);
mdatepicker_start.init(year, monthofyear, dayofmonth, this);
mdatepicker_end.init(year, monthofyear, dayofmonth, this);
// updatetitle(year, monthofyear, dayofmonth);
// 如果要隐藏当前日期，则使用下面方法。
if (!isdayvisible) {
hidday(mdatepicker_start);
hidday(mdatepicker_end);
}
}
/**
* 隐藏datepicker中的日期显示
*
* @param mdatepicker
*/
private void hidday(datepicker mdatepicker) {
field[] datepickerffields = mdatepicker.getclass().getdeclaredfields();
for (field datepickerfield : datepickerffields) {
if ("mdayspinner".equals(datepickerfield.getname())) {
datepickerfield.setaccessible(true);
object daypicker = new object();
try {
daypicker = datepickerfield.get(mdatepicker);
} catch (illegalaccessexception e) {
e.printstacktrace();
} catch (illegalargumentexception e) {
e.printstacktrace();
}
// datepicker.getcalendarview().setvisibility(view.gone);
((view) daypicker).setvisibility(view.gone);
}
}
}
public void onclick(dialoginterface dialog, int which) {
// log.d(this.getclass().getsimplename(), string.format("which:%d",
// which));
// 如果是“取 消”按钮，则返回，如果是“确 定”按钮，则往下执行
if (which == button_positive)
trynotifydateset();
}
@override
public void ondatechanged(datepicker view, int year, int month, int day) {
if (view.getid() == r.id.datepickerstart)
mdatepicker_start.init(year, month, day, this);
if (view.getid() == r.id.datepickerend)
mdatepicker_end.init(year, month, day, this);
// updatetitle(year, month, day);
}
/**
* 获得开始日期的datepicker
*
* @return the calendar view.
*/
public datepicker getdatepickerstart() {
return mdatepicker_start;
}
/**
* 获得结束日期的datepicker
*
* @return the calendar view.
*/
public datepicker getdatepickerend() {
return mdatepicker_end;
}
/**
* sets the start date.
*
* @param year
* the date year.
* @param monthofyear
* the date month.
* @param dayofmonth
* the date day of month.
*/
public void updatestartdate(int year, int monthofyear, int dayofmonth) {
mdatepicker_start.updatedate(year, monthofyear, dayofmonth);
}
/**
* sets the end date.
*
* @param year
* the date year.
* @param monthofyear
* the date month.
* @param dayofmonth
* the date day of month.
*/
public void updateenddate(int year, int monthofyear, int dayofmonth) {
mdatepicker_end.updatedate(year, monthofyear, dayofmonth);
}
private void trynotifydateset() {
if (mcallback != null) {
mdatepicker_start.clearfocus();
mdatepicker_end.clearfocus();
mcallback.ondateset(mdatepicker_start, mdatepicker_start.getyear(), mdatepicker_start.getmonth(),
mdatepicker_start.getdayofmonth(), mdatepicker_end, mdatepicker_end.getyear(),
mdatepicker_end.getmonth(), mdatepicker_end.getdayofmonth());
}
}
@override
protected void onstop() {
// trynotifydateset();
super.onstop();
}
@override
public bundle onsaveinstancestate() {
bundle state = super.onsaveinstancestate();
state.putint(start_year, mdatepicker_start.getyear());
state.putint(start_month, mdatepicker_start.getmonth());
state.putint(start_day, mdatepicker_start.getdayofmonth());
state.putint(end_year, mdatepicker_end.getyear());
state.putint(end_month, mdatepicker_end.getmonth());
state.putint(end_day, mdatepicker_end.getdayofmonth());
return state;
}
@override
public void onrestoreinstancestate(bundle savedinstancestate) {
super.onrestoreinstancestate(savedinstancestate);
int start_year = savedinstancestate.getint(start_year);
int start_month = savedinstancestate.getint(start_month);
int start_day = savedinstancestate.getint(start_day);
mdatepicker_start.init(start_year, start_month, start_day, this);
int end_year = savedinstancestate.getint(end_year);
int end_month = savedinstancestate.getint(end_month);
int end_day = savedinstancestate.getint(end_day);
mdatepicker_end.init(end_year, end_month, end_day, this);
}
}
这些代码是以datepickerdialog.java为基础修改的。总的来说，阅读源码是一种好习惯。这里面最需要注意的是hidday方法，该方法如果调用，则隐藏“日”的选择框，只能选择“年月”。这个方法的实现也比较有难度，需要通过反射，找出datepicker中表示日的字段，并将其设置为隐藏。
还有一点需要注意的是，为了让控件显示更加好看，我用了一张名字为fenge.png的图片，图片在我提供的源码中可以找到。
下面就需要编辑activity_main.xml了，这个内容相当简单，只要一个显示的text和一个button即可，代码如下：
<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/linearlayout01"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<edittext
android:id="@+id/et"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:cursorvisible="false"
android:editable="false" />
<button
android:id="@+id/datebtn"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="日期对话框" />
</linearlayout>
最后，在mainactivity.java中，加入测试代码：
package com.example.doubledatepicker;
import java.util.calendar;
import android.app.activity;
import android.os.bundle;
import android.view.view;
import android.widget.button;
import android.widget.datepicker;
import android.widget.textview;
public class mainactivity extends activity {
button btn;
textview et;
@override
protected void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
setcontentview(r.layout.activity_main);
btn = (button) findviewbyid(r.id.datebtn);
et = (textview) findviewbyid(r.id.et);
btn.setonclicklistener(new view.onclicklistener() {
calendar c = calendar.getinstance();
@override
public void onclick(view v) {
// 最后一个false表示不显示日期，如果要显示日期，最后参数可以是true或者不用输入
new doubledatepickerdialog(mainactivity.this, 0, new doubledatepickerdialog.ondatesetlistener() {
@override
public void ondateset(datepicker startdatepicker, int startyear, int startmonthofyear,
int startdayofmonth, datepicker enddatepicker, int endyear, int endmonthofyear,
int enddayofmonth) {
string textstring = string.format("开始时间：%d-%d-%d\n结束时间：%d-%d-%d\n", startyear,
startmonthofyear + 1, startdayofmonth, endyear, endmonthofyear + 1, enddayofmonth);
et.settext(textstring);
}
}, c.get(calendar.year), c.get(calendar.month), c.get(calendar.date), true).show();
}
});
}
}
可以看到，在新建doubledatepickerdialog时， 我们实现了一个new doubledatepickerdialog.ondatesetlistener()的匿名类，这个类被doubledatepickerdialog引用，当doubledatepickerdialog中的“确 定”按钮被点击时，就会调用匿名类的ondateset方法。（这也是事件绑定的基本原理）。
doubledatepickerdialog构造函数的最后一个参数，true为显示日期，false为不显示日期。
当最后一个参数为true时，显示效果如下：
当最后一个参数为false时，显示如下
源码下载地址：http://xiazai.jb51.net/201701/yuanma/doubledatepicker_jb51.rar
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。