完美实现ExpandableListView二级分栏效果

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;
 }
}

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;
 }
}

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;
 }
}

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);
 }
}