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); }}