本篇文章为大家展示了使用ExpandableListView怎么实现一个二级列表，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。
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xml创建一个 ExpandableListView
ExpandableListView的一级列表布局
ExpandableListView的二级列表布局
Java代码
package com.example.expandablelistview;
import java.util.ArrayList;
import java.util.List;
import android.R.string;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.TextView;
public class MainActivity extends Activity {
private MainActivity.Madapder madapder;
private ExpandableListView expandableListView;
private List allList;
private List> list;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//获取控件
expandableListView=(ExpandableListView) findViewById(R.id.expandableListView);
//初始化数据
initData();
//自定义适配器
madapder=new Madapder();
expandableListView.setAdapter(madapder);
}
public void initData() {
allList=new ArrayList();
allList.add("列表①");
allList.add("列表②");
allList.add("列表③");
list=new ArrayList>();
List list1=new ArrayList();
list1.add(new Person(" 虞姬"));
list1.add(new Person(" 甄姬"));
list1.add(new Person(" 阿狸"));
list1.add(new Person(" 狐狸"));
List list2=new ArrayList();
list2.add(new Person(" 李白"));
list2.add(new Person(" 項羽"));
list2.add(new Person(" 荊軻"));
list2.add(new Person(" 曹操"));
List list3=new ArrayList();
list3.add(new Person(" 公孙离"));
list3.add(new Person(" 孙尚香"));
list3.add(new Person(" 狄仁杰"));
list3.add(new Person(" 蔡文姬"));
list.add(list1);
list.add(list2);
list.add(list3);
}
class Madapder extends BaseExpandableListAdapter{
@Override
public int getGroupCount() {
// TODO Auto-generated method stub
return allList.size();
}
@Override
public int getChildrenCount(int groupPosition) {
// TODO Auto-generated method stub
return list.get(groupPosition).size();
}
@Override
public Object getGroup(int groupPosition) {
// TODO Auto-generated method stub
return allList.get(groupPosition);
}
@Override
public Object getChild(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
return list.get(groupPosition).get(childPosition);
}
@Override
public long getGroupId(int groupPosition) {
// TODO Auto-generated method stub
return groupPosition;
}
@Override
public long getChildId(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
return childPosition;
}
@Override
public boolean hasStableIds() {
// TODO Auto-generated method stub
return true;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
GroupView groupView;
if(convertView==null){
groupView=new GroupView();
//获取一级列表的布局
convertView=View.inflate(MainActivity.this,R.layout.item_1, null);
//复用控件
groupView.name=(TextView) convertView.findViewById(R.id.one_name);
//绑定
convertView.setTag(groupView);
}else {
groupView = (GroupView) convertView.getTag();
}
//给控件设置值
groupView.name.setText(allList.get(groupPosition));
return convertView;
}
@Override
public View getChildView(int groupPosition, int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
ViewHolder Holder;
if(convertView==null){
Holder=new ViewHolder();
//获取二级列表的布局
convertView=View.inflate(MainActivity.this,R.layout.item_2, null);
//复用控件
Holder.text_name=(TextView) convertView.findViewById(R.id.tow_name);
//绑定
convertView.setTag(Holder);
}else {
Holder = (ViewHolder) convertView.getTag();
}
//给控件设置值
Holder.text_name.setText(list.get(groupPosition).get(childPosition).getName());
return convertView;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
return true;
}
}
class ViewHolder{
TextView text_name;
}
class GroupView{
TextView name;
}
}Java_封装类
package com.example.expandablelistview;
public class Person {
String name;
public Person() {
// TODO Auto-generated constructor stub
}
public Person(String name) {
super();
this.name = name;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return "Person [name=" + name + "]";
}
}上述内容就是使用ExpandableListView怎么实现一个二级列表，你们学到知识或技能了吗？如果还想学到更多技能或者丰富自己的知识储备，欢迎关注创新互联行业资讯频道。
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