ExpandableListView二级列表

Posted 2020-07-22

XMl

 1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     tools:context=".MainActivity" >
 6 
 7     <ExpandableListView 
 8         android:id="@+id/elv"
 9         android:layout_width="match_parent"
10         android:layout_height="match_parent"
11     
12         ></ExpandableListView>
13 
14 </RelativeLayout>

MainActivity

1 package com.bawei.d2;
  2 
  3 import android.os.Bundle;
  4 import android.app.Activity;
  5 import android.view.Menu;
  6 import android.view.View;
  7 import android.view.ViewGroup;
  8 import android.widget.BaseExpandableListAdapter;
  9 import android.widget.ExpandableListView;
 10 import android.widget.ExpandableListView.OnChildClickListener;
 11 import android.widget.TextView;
 12 import android.widget.Toast;
 13 
 14 public class MainActivity extends Activity {
 15 
 16     private String[][] secondNames;
 17     private String[] names;
 18 
 19     @Override
 20     protected void onCreate(Bundle savedInstanceState) {
 21         super.onCreate(savedInstanceState);
 22         setContentView(R.layout.activity_main);
 23     ExpandableListView  elv=(ExpandableListView) findViewById(R.id.elv);
 24     
 25     names = new String[]{"     第一组","     第二组","     第三组","     第四组"};
 26     secondNames = new  String[][]{
 27             {"a","b","c"},
 28             {"d","e","f"},
 29             {"q","w","e","r"},
 30             {"s","d"}
 31     };
 32     
 33     elv.setAdapter(new BaseExpandableListAdapter() {
 34         
 35         @Override
 36         //控制二级列表条目是否可以点击
 37         public boolean isChildSelectable(int groupPosition, int childPosition) {
 38             // TODO Auto-generated method stub
 39             return true;
 40         }
 41         
 42         @Override
 43         
 44         public boolean hasStableIds() {
 45             // TODO Auto-generated method stub
 46             return false;
 47         }
 48         
 49         @Override
 50          //返回一级列表的条目布局
 51         public View getGroupView(int groupPosition, boolean isExpanded,
 52                 View convertView, ViewGroup parent) {
 53             View view=View.inflate(MainActivity.this,android.R.layout.simple_list_item_1,null);
 54             TextView textView= (TextView) view.findViewById(android.R.id.text1);
 55             textView.setText(names[groupPosition]);
 56             return view;
 57         }
 58         
 59         @Override
 60         //获取一级列表给定的Id
 61         public long getGroupId(int groupPosition) {
 62             // TODO Auto-generated method stub
 63             return groupPosition;
 64         }
 65         
 66         @Override
 67         //第一列表的个数
 68         public int getGroupCount() {
 69             // TODO Auto-generated method stub
 70             return names.length;
 71         }
 72         
 73         @Override
 74          //获取给定的一级列表的数据
 75         public Object getGroup(int groupPosition) {
 76             // TODO Auto-generated method stub
 77             return groupPosition;
 78         }
 79         
 80         @Override
 81         //第二级列表的个数
 82         public int getChildrenCount(int groupPosition) {
 83             // TODO Auto-generated method stub
 84             return secondNames[groupPosition].length;
 85         }
 86         
 87         @Override
 88          //返回二级列表的条目布局
 89 
 90         public View getChildView(int groupPosition, int childPosition,
 91                 boolean isLastChild, View convertView, ViewGroup parent) {
 92             View view= View.inflate(MainActivity.this,android.R.layout.simple_list_item_1, null);
 93             TextView textView=(TextView) view.findViewById(android.R.id.text1);
 94             textView.setText(secondNames[groupPosition][childPosition]);
 95             return view;
 96         }
 97         
 98         @Override
 99          //获取二级列表给定的ID
100         public long getChildId(int groupPosition, int childPosition) {
101             // TODO Auto-generated method stub
102             return childPosition;
103         }
104         
105         @Override
106         //获取给定的二级列表的数据
107         public Object getChild(int groupPosition, int childPosition) {
108             // TODO Auto-generated method stub
109             return childPosition;
110         }
111     });        //二级列表监听
112     elv.setOnChildClickListener(new OnChildClickListener() {
113         
114         @Override
115         public boolean onChildClick(ExpandableListView parent, View v,
116                 int groupPosition, int childPosition, long id) {
117             Toast.makeText(MainActivity.this, "你点击了第"+(groupPosition+1)+"组的第"+(childPosition+1)+"项", 0).show();
118             return false;
119         }
120     });
121     
122     
123         
124 
125     }
126 
127     
128 }