android实现双日期选择控件（可隐藏日，只显示年月）

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。