完美实现ExpandableListView二级分栏效果

本文实例为大家分享了expandablelistview二级分栏效果的具体代码，供大家参考，具体内容如下

对expandablelistview控件进行封装（未自定义）直接上代码：

通用viewholder类，仅在setimageresource中添加代码

package com.svp.haoyan.expandablelistview.tool;

import android.content.context;
import android.graphics.bitmap;
import android.util.sparsearray;
import android.view.layoutinflater;
import android.view.view;
import android.view.viewgroup;
import android.widget.imageview;
import android.widget.textview;

/**
 * created by haoyan on 2016/3/24.
 */
public class viewholder {
 //存储数据
 private sparsearray<view> mviews;

 private int mposition;
 private view mconvertview;
 private boolean misexpanded;
 public viewholder(context context, viewgroup parent, int layoutid, int position,boolean isexpanded) {

  this.mposition=position;
  this.mviews= new sparsearray<view>();
  this.misexpanded=isexpanded;
  //三
  mconvertview= layoutinflater.from(context).inflate(layoutid,parent,false);
  //一
  mconvertview.settag(this);
 }
 public static viewholder get(context context,view convertview,
         viewgroup parent,int layoutid,int position,boolean isexpanded){

  if (convertview==null){
   return new viewholder(context,parent,layoutid,position,isexpanded);
  }else {
   //五 六
   viewholder holder=(viewholder)convertview.gettag();
   holder.mposition=position;
   return holder;
  }
 }
 //通过viewid获取控件
 //泛型t返回子类
 public <t extends view> t getview(int viewid){

  view view =mviews.get(viewid);
  if (view==null){
   //四
   view=mconvertview.findviewbyid(viewid);
   mviews.put(viewid,view);
  }
  return (t)view;
 }
 //八
 public view getmconvertview() {
  return mconvertview;
 }

 /**
  * 设置textview的值
  * @param viewid
  * @param text
  * @return
  */
 //四 七 九
 public viewholder settext(int viewid,string text){
  textview tv= getview(viewid);
  tv.settext(text);
  return this;
 }
 /**
  * 一参传id，二参传图片地址，三参为true则调用点击变化效果，默认为false.
  * */
 public viewholder setimageresource(int viewid,int resid,boolean expanded){
  imageview view= getview(viewid);
  view.setimageresource(resid);
  if (expanded){
   if (misexpanded){
    view.setvisibility(view.gone);
   }else {
    view.setvisibility(view.visible);
   }
  }
  return this;
 }
 public viewholder setimagebitamp(int viewid,bitmap bitmap){
  imageview view= getview(viewid);
  view.setimagebitmap(bitmap);
  return this;
 }
 public viewholder setimageuri(int viewid,string uri){
  imageview view= getview(viewid);
//  imageloader.getinstance().loadimg(view,uri);
  return this;
 }

}

实体类expand_dto:

package com.svp.haoyan.expandablelistview.dto;

/**
 * created by haoyan on 2016/5/7.
 */
public class expand_dto {

 private string name;
 private string contents;
 private int pic;
 private int photo;

 public static class expand_child {
  private string childname;
  private string childcont;

  public string getchildname() {
   return childname;
  }

  public void setchildname(string childname) {
   this.childname = childname;
  }

  public string getchildcont() {
   return childcont;
  }

  public void setchildcont(string childcont) {
   this.childcont = childcont;
  }
 }
 public string getname() {
  return name;
 }

 public void setname(string name) {
  this.name = name;
 }

 public string getcontents() {
  return contents;
 }

 public void setcontents(string contents) {
  this.contents = contents;
 }

 public int getpic() {
  return pic;
 }

 public void setpic(int pic) {
  this.pic = pic;
 }

 public int getphoto() {
  return photo;
 }

 public void setphoto(int photo) {
  this.photo = photo;
 }


}

接下来是最主要的adapter：

package com.svp.haoyan.expandablelistview;

import android.content.context;
import android.database.datasetobserver;
import android.view.view;
import android.view.viewgroup;
import android.widget.expandablelistadapter;

import com.svp.haoyan.expandablelistview.tool.viewholder;

import java.util.list;
import java.util.map;

/**
 * created by haoyan on 2016/4/28.
 */
public abstract class myexpandablelistadapter<t,f>implements expandablelistadapter {
 private context mcontext;
 private list<t> mexpand_dtos;
 private map<integer, list<f>> mmap = null;
 public myexpandablelistadapter(context context, list<t> expand_dtos,map<integer, list<f>> map) {
  this.mcontext = context;
  this.mexpand_dtos = expand_dtos;
  this.mmap=map;
 }
 /*注册一个观察者(observer)，当此适配器数据修改时即调用此观察者。*/
 @override
 public void registerdatasetobserver(datasetobserver observer) {

 }
 /*取消先前通过registerdatasetobserver(datasetobserver)方式注册进该适配器中的观察者对象*/
 @override
 public void unregisterdatasetobserver(datasetobserver observer) {

 }
 /*获取组的个数*/
 @override
 public int getgroupcount() {
  return mexpand_dtos.size();
 }
 /*返回在指定group的child数目。*/
 @override
 public int getchildrencount(int groupposition) {
  return mmap.get(groupposition).size();
 }
 //获取当前父item的数据
 @override
 public t getgroup(int groupposition) {
  return mexpand_dtos.get(groupposition);
 }
 /*获取与在指定group给予child相关的数据。*/
 @override
 public f getchild(int groupposition, int childposition) {
  return (mmap.get(groupposition).get(childposition));
 }
 /*获取指定组的id*/
 @override
 public long getgroupid(int groupposition) {
  return groupposition;
 }
 //得到子item的id
 @override
 public long getchildid(int groupposition, int childposition) {
  return childposition;
 }
 //组和子元素是否持有稳定的id,也就是底层数据的改变不会影响到它们。(没效果)
 @override
 public boolean hasstableids() {
  return true;
 }
 //设置父item组件
 @override
 public view getgroupview(int groupposition, boolean isexpanded, view convertview, viewgroup parent) {
  viewholder viewholder = viewholder.get(mcontext, convertview, parent, r.layout.expand_groupview, groupposition,isexpanded);
  convert(viewholder, getgroup(groupposition));
  return viewholder.getmconvertview();
 }
 //自己写
 public abstract void convert(viewholder viewholder, t t);

 public abstract void convertchild(viewholder viewholder, f f);
 //设置子item的组件
 @override
 public view getchildview(int groupposition, int childposition, boolean islastchild, view convertview, viewgroup parent) {
  viewholder viewholder = viewholder.get(mcontext, convertview, parent, r.layout.expand_childview, groupposition,islastchild);
  convertchild(viewholder, getchild(groupposition,childposition));
  return viewholder.getmconvertview();
  /*子元素是否处于组中的最后一个(对每个组的最后一个进行操作)*/
  //boolean islastchild
  /*下边是未封装代码，提供参考*/
//  string childname = (mmap.get(groupposition).get(childposition)).getchildname();
//  layoutinflater inflater = (layoutinflater)mcontext.getsystemservice(context.layout_inflater_service);
//  convertview = inflater.inflate(r.layout.expand_childview, null);
//  textview tv_child = (textview) convertview.findviewbyid(r.id.tv_child);
//  tv_child.settext(childcont);
 }
 /*是否选中指定位置上的子元素。*/
 @override
 public boolean ischildselectable(int groupposition, int childposition) {
  return true;
 }
 /*true所有条目可以选择和点击*/
 @override
 public boolean areallitemsenabled() {
  return false;
 }
 /*如果当前适配器不包含任何数据则返回true。经常用来决定一个空视图是否应该被显示。
 一个典型的实现将返回表达式getcount() == 0的结果，但是由于getcount()包含了头部和尾部，适配器可能需要不同的行为。*/
 @override
 public boolean isempty() {
  return false;
 }
 /*当组展开状态的时候此方法被调用。*/
 @override
 public void ongroupexpanded(int groupposition) {

 }
 /*当组收缩状态的时候此方法被调用。*/
 @override
 public void ongroupcollapsed(int groupposition) {

 }
 /*根据所给的子id号和组id号返回唯一的id。此外，若hasstableids()是true，那么必须要返回稳定的id。*/
 @override
 public long getcombinedchildid(long groupid, long childid) {
  return 0;
 }
 /*同上*/
 @override
 public long getcombinedgroupid(long groupid) {
  return 0;
 }
}

最后是调用类activity:

package com.svp.haoyan.expandablelistview;

import android.os.bundle;
import android.support.v7.app.appcompatactivity;
import android.widget.expandablelistview;

import com.svp.haoyan.expandablelistview.dto.expand_dto;
import com.svp.haoyan.expandablelistview.tool.viewholder;

import java.util.arraylist;
import java.util.hashmap;
import java.util.list;

public class mainactivity extends appcompatactivity {
 private expandablelistview elistview;
 private list<expand_dto> expanddata;
 private hashmap<integer, list<expand_dto.expand_child>> map = null;

 @override
 protected void oncreate(bundle savedinstancestate) {
  super.oncreate(savedinstancestate);
  setcontentview(r.layout.activity_main);
  dataview();
  expandview();
 }

 private void expandview() {
  elistview = (expandablelistview) findviewbyid(r.id.expandable_lv);
  elistview.setadapter(new myexpandablelistadapter<expand_dto,expand_dto.expand_child>(this, expanddata,map) {
   @override
   public void convert(viewholder viewholder, expand_dto expand_dto) {
    viewholder.settext(r.id.tv_expand, expand_dto.getname())
      .settext(r.id.tv_expand_two, expand_dto.getcontents())
      .setimageresource(r.id.img_expand, expand_dto.getpic(),false)
      .setimageresource(r.id.img_expand_two, expand_dto.getphoto(),false);
   }

   @override
   public void convertchild(viewholder viewholder, expand_dto.expand_child expand_child) {
    viewholder.settext(r.id.tv_child,expand_child.getchildname())
       .settext(r.id.tv_child2,expand_child.getchildcont());
   }
  });
  //去掉自带箭头
  elistview.setgroupindicator(null);
 }

 private void dataview() {
  expanddata = new arraylist<expand_dto>();
  expand_dto bean_zero = new expand_dto();
  bean_zero.setname("android新技能1");
  bean_zero.setcontents("1");
  bean_zero.setpic(r.drawable.icon_check);
  bean_zero.setphoto(r.drawable.travel_airfare_cn_position);
  expanddata.add(bean_zero);

  expand_dto bean_one = new expand_dto();
  bean_one.setname("android新技能2");
  bean_one.setcontents("2");
  bean_one.setpic(r.drawable.icon_check);
  bean_one.setphoto(r.drawable.travel_airfare_cn_position);
  expanddata.add(bean_one);

  expand_dto bean_two = new expand_dto();
  bean_two.setname("android新技能3");
  bean_two.setcontents("3");
  bean_two.setpic(r.drawable.icon_check);
  bean_two.setphoto(r.drawable.travel_airfare_cn_position);
  expanddata.add(bean_two);

  //这里可以使用sparsearray优化性能
  map = new hashmap<integer, list<expand_dto.expand_child>>();
  list<expand_dto.expand_child> expand_children_zero=new arraylist<expand_dto.expand_child>();
  expand_dto.expand_child child1=new expand_dto.expand_child();
  child1.setchildname("11111");
  child1.setchildcont("22222");
  expand_children_zero.add(child1);

  expand_dto.expand_child child2=new expand_dto.expand_child();
  child2.setchildname("3333333");
  child2.setchildcont("4444444");
  expand_children_zero.add(child2);
  map.put(0,expand_children_zero);

  list<expand_dto.expand_child> expand_children_one=new arraylist<expand_dto.expand_child>();
  expand_dto.expand_child child3=new expand_dto.expand_child();
  child3.setchildname("55555");
  child3.setchildcont("66666");
  expand_children_one.add(child3);

  expand_dto.expand_child child4=new expand_dto.expand_child();
  child4.setchildname("77777");
  child4.setchildcont("88888");
  expand_children_one.add(child4);
  map.put(1,expand_children_one);

  list<expand_dto.expand_child> children_data_two=new arraylist<expand_dto.expand_child>();
  expand_dto.expand_child child5=new expand_dto.expand_child();
  child5.setchildname("99999");
  child5.setchildcont("00000");
  children_data_two.add(child5);

  expand_dto.expand_child child6=new expand_dto.expand_child();
  child6.setchildname("12345");
  child6.setchildcont("54321");
  children_data_two.add(child6);
  map.put(2,children_data_two);

 }
}

完活布局很简单就不贴出来了，加上图片有图有真相：

源码下载：expandablelistview二级分栏效果

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。