Android简单的BaseExpandableList使用

1.Activity

 1 package com.example.administrator.mystudent.ExpandableListView;
 2 
 3 import android.app.ExpandableListActivity;
 4 import android.os.Bundle;
 5 
 6 
 7 public class ExpandableListViewActivity extends ExpandableListActivity {
 8 
 9     @Override
10     protected void onCreate(Bundle savedInstanceState) {
11         super.onCreate(savedInstanceState);
12         setTitle("二级列表的使用");
13         //设置适配器
14         setListAdapter(new MyExpandableListAdapter(this));
15     }
16 }

2.adapter适配器

  1 package com.example.administrator.mystudent.ExpandableListView;
  2 
  3 import android.content.Context;
  4 import android.view.View;
  5 import android.view.ViewGroup;
  6 import android.widget.BaseExpandableListAdapter;
  7 import android.widget.TextView;
  8 
  9 import java.util.ArrayList;
 10 import java.util.List;
 11 
 12 /**
 13  * Created by hyang on 2017/3/1
 14  * email 390315032@qq.com.
 15  * 可收缩列表适配器
 16  */
 17 
 18 public class MyExpandableListAdapter extends BaseExpandableListAdapter {
 19 
 20     private Context context;
 21     private String [] group={"衣服","食品","水果"};
 22     private String [] cloths={"衬衫","西裤","内衣"};
 23     private String [] food={"面包","蛋糕","可乐","橙汁"};
 24     private String [] fruits={"苹果","香蕉","草莓"};
 25 
 26     private List<String> groupList = null;
 27     private List<List<String>> itemList = null;
 28 
 29     protected MyExpandableListAdapter(Context context){
 30         this.context=context;
 31         groupList=new ArrayList<String>();
 32         itemList=new ArrayList<List<String>>();
 33 
 34         setListData();
 35     }
 36 
 37     /**
 38      * 向list中添加数据
 39      */
 40     private void setListData() {
 41         for(String s:group){
 42             groupList.add(s);
 43         }
 44         List clothsList=new ArrayList();
 45         List foodList=new ArrayList();
 46         List fruitsList=new ArrayList();
 47 
 48         for(String s:cloths){
 49             clothsList.add(s);
 50         }
 51         for(String s:food){
 52             foodList.add(s);
 53         }
 54         for(String s:fruits){
 55             fruitsList.add(s);
 56         }
 57 
 58         itemList.add(clothsList);
 59         itemList.add(foodList);
 60         itemList.add(fruitsList);
 61     }
 62 
 63     @Override
 64     public int getGroupCount() {
 65         //返回组数量
 66         return itemList.size();
 67     }
 68 
 69     @Override
 70     public int getChildrenCount(int groupPosition) {
 71         //返回当前组的节点数量
 72         return itemList.get(groupPosition).size();
 73     }
 74 
 75     @Override
 76     public Object getGroup(int groupPosition) {
 77         //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
 78         return groupList.get(groupPosition);
 79     }
 80 
 81     @Override
 82     public Object getChild(int groupPosition, int childPosition) {
 83         //设置子节点数据
 84         return itemList.get(groupPosition).get(childPosition);
 85     }
 86 
 87     @Override
 88     public long getGroupId(int groupPosition) {
 89         return groupPosition;
 90     }
 91 
 92     @Override
 93     public long getChildId(int groupPosition, int childPosition) {
 94         return childPosition;
 95     }
 96 
 97     @Override
 98     public boolean hasStableIds() {
 99         return false;
100     }
101 
102     @Override
103     public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
104         //设置组显示View，这里可是设置布局文件引用
105         TextView view=null;
106         if(convertView==null){
107             view=new TextView(context);
108         }else{
109             view= (TextView) convertView;
110         }
111         //设置textView的显示样式
112         view.setTextSize(30);
113         view.setPadding(50,5,0,5);
114         //向textView设置数据
115         String s=groupList.get(groupPosition);
116         view.setText(s);
117         return view;
118     }
119 
120     @Override
121     public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
122         //设置节点显示View，这里可是设置布局文件引用
123         TextView view=null;
124         if(convertView==null){
125             view=new TextView(context);
126         }else{
127             view= (TextView) convertView;
128         }
129         view.setTextSize(20);
130         view.setPadding(30,5,0,5);
131         //向textView设置数据
132         String s=itemList.get(groupPosition).get(childPosition);
133         view.setText(s);
134         return view;
135     }
136 
137     @Override
138     public boolean isChildSelectable(int groupPosition, int childPosition) {
139         return true;
140     }
141 }