Android简单的BaseExpandableList使用

1.Activity

 package com.example.administrator.mystudent.ExpandableListView;

 import android.app.ExpandableListActivity;
 import android.os.Bundle;

 public class ExpandableListViewActivity extends ExpandableListActivity {

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setTitle("二级列表的使用");
         //设置适配器
         setListAdapter(new MyExpandableListAdapter(this));
     }
 }

2.adapter适配器

 package com.example.administrator.mystudent.ExpandableListView;

 import android.content.Context;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.BaseExpandableListAdapter;
 import android.widget.TextView;

 import java.util.ArrayList;
 import java.util.List;

 /**
  * Created by hyang on 2017/3/1
  * email [e-mail].
  * 可收缩列表适配器
  */

 public class MyExpandableListAdapter extends BaseExpandableListAdapter {

     private Context context;
     private String [] group={"衣服","食品","水果"};
     private String [] cloths={"衬衫","西裤","内衣"};
     private String [] food={"面包","蛋糕","可乐","橙汁"};
     private String [] fruits={"苹果","香蕉","草莓"};

     private List<String> groupList = null;
     private List<List<String>> itemList = null;

     protected MyExpandableListAdapter(Context context){
         this.context=context;
         groupList=new ArrayList<String>();
         itemList=new ArrayList<List<String>>();

         setListData();
     }

     /**
      * 向list中添加数据
      */
     private void setListData() {
         for(String s:group){
             groupList.add(s);
         }
         List clothsList=new ArrayList();
         List foodList=new ArrayList();
         List fruitsList=new ArrayList();

         for(String s:cloths){
             clothsList.add(s);
         }
         for(String s:food){
             foodList.add(s);
         }
         for(String s:fruits){
             fruitsList.add(s);
         }

         itemList.add(clothsList);
         itemList.add(foodList);
         itemList.add(fruitsList);
     }

     @Override
     public int getGroupCount() {
         //返回组数量
         return itemList.size();
     }

     @Override
     public int getChildrenCount(int groupPosition) {
         //返回当前组的节点数量
         return itemList.get(groupPosition).size();
     }

     @Override
     public Object getGroup(int groupPosition) {
         //返回分组对象，用于一些数据传递，在事件处理时可直接取得和分组相关的数据
         return groupList.get(groupPosition);
     }

     @Override
     public Object getChild(int groupPosition, int childPosition) {
         //设置子节点数据
         return itemList.get(groupPosition).get(childPosition);
     }

     @Override
     public long getGroupId(int groupPosition) {
         return groupPosition;
     }

     @Override
     public long getChildId(int groupPosition, int childPosition) {
         return childPosition;
     }

     @Override
     public boolean hasStableIds() {
         return false;
     }

     @Override
     public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
         //设置组显示View，这里可是设置布局文件引用
         TextView view=null;
         if(convertView==null){
             view=new TextView(context);
         }else{
             view= (TextView) convertView;
         }
         //设置textView的显示样式
         view.setTextSize(30);
         view.setPadding(50,5,0,5);
         //向textView设置数据
         String s=groupList.get(groupPosition);
         view.setText(s);
         return view;
     }

     @Override
     public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
         //设置节点显示View，这里可是设置布局文件引用
         TextView view=null;
         if(convertView==null){
             view=new TextView(context);
         }else{
             view= (TextView) convertView;
         }
         view.setTextSize(20);
         view.setPadding(30,5,0,5);
         //向textView设置数据
         String s=itemList.get(groupPosition).get(childPosition);
         view.setText(s);
         return view;
     }

     @Override
     public boolean isChildSelectable(int groupPosition, int childPosition) {
         return true;
     }
 }