title: Android ExpandableListView基础用法
date: 2017-08-09 16:28:24
tags:
- Android
- ExpandableListView
categories: [Android]
ExpandableListView简介
可以折叠的ListView
基本使用
使用方法和ListView大同小异,都是需要item的布局,需要adapter
But:
ExpandableListView需要父Item布局,需要子Item布局.Adapter需要的是BaseExpandableListAdapter
下面以一个好友分组的例子总结一下用法
布局
分组Item布局
效果图:
[图片上传失败...(image-7b8c6d-1517714108866)]
好友Item布局
效果图:
[图片上传失败...(image-5d2d01-1517714108866)]
封装数据
FriendGroupItem
public class FriendGroupItem {
private String id;
private String friendgroup_name;
private List list_friend;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getFriendgroup_name() {
return friendgroup_name;
}
public void setFriendgroup_name(String friendgroup_name) {
this.friendgroup_name = friendgroup_name;
}
public List getList_friend() {
return list_friend;
}
public void setList_friend(List list_friend) {
this.list_friend = list_friend;
}
}
FriendGroupItem
public class FriendItem {
private String sortLetters; //显示数据拼音的首字母
private String user_id;
private String nickname;
private String username;
private String user_head_path;
private String signature;
public String getUser_id() {
return user_id;
}
public void setUser_id(String user_id) {
this.user_id = user_id;
}
public String getNickname() {
return nickname;
}
public void setNickname(String nickname) {
this.nickname = nickname;
}
public String getUser_head_path() {
return user_head_path;
}
public void setUser_head_path(String user_head_path) {
this.user_head_path = user_head_path;
}
public String getSignature() {
return signature;
}
public void setSignature(String signature) {
this.signature = signature;
}
public void setUsername(String username){
this.username = username;
}
public String getUsername(){
return this.username;
}
public String getSortLetters() {
return sortLetters;
}
public void setSortLetters(String sortLetters) {
this.sortLetters = sortLetters;
}
}
Adapter适配器
FriendGroupItemExpandableBaseAdapter
/**
* Created by Allever on 2016/6/14.
* 好友分组项适配器
*/
public class FriendGroupItemExpandableBaseAdapter extends BaseExpandableListAdapter {
private Context context;
private LayoutInflater inflater;
private List list_friendgroupItem;
public FriendGroupItemExpandableBaseAdapter(Context context, List list_friendgroupItem){
this.context = context;
this.list_friendgroupItem = list_friendgroupItem;
inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public View getGroupView(int parentPosition, boolean isExpanded, View convertView, ViewGroup parent) {
FriendGroupItem friendGroupItem = list_friendgroupItem.get(parentPosition);
View view;
ParentViewHolder parentViewHolder;
if (convertView == null){
view = inflater.inflate(R.layout.friendgroup_item_parent,parent,false);
parentViewHolder = new ParentViewHolder();
parentViewHolder.tv_friendgroup_name = (TextView)view.findViewById(R.id.id_friendgroup_item_parent_tv_friendgroup_name);
parentViewHolder.iv_expand = (ImageView)view.findViewById(R.id.id_friendgroup_item_parent_iv_expand);
parentViewHolder.tv_friend_count = (TextView)view.findViewById(R.id.id_friendgroup_item_parent_tv_friend_count);
view.setTag(parentViewHolder);
}else{
view = convertView;
parentViewHolder = (ParentViewHolder)view.getTag();
}
//判断isExpanded就可以控制是按下还是关闭，同时更换图片
if (isExpanded){
parentViewHolder.iv_expand.setImageDrawable(context.getResources().getDrawable(R.mipmap.ic_expanded));
}else{
parentViewHolder.iv_expand.setImageDrawable(context.getResources().getDrawable(R.mipmap.ic_unexpanded));
}
parentViewHolder.tv_friend_count.setText(friendGroupItem.getList_friend().size()+"");
parentViewHolder.tv_friendgroup_name.setText(friendGroupItem.getFriendgroup_name());
return view;
}
@Override
public View getChildView(int parentPosition, int childPosition, boolean b, View convertView, ViewGroup parent) {
FriendItem friendItem = list_friendgroupItem.get(parentPosition).getList_friend().get(childPosition);
View view;
ChildViewHolder childViewHolder;
if(convertView == null){
view = inflater.inflate(R.layout.friendgroup_item_child,parent,false);
childViewHolder = new ChildViewHolder();
childViewHolder.iv_head = (CircleImageView)view.findViewById(R.id.id_friendgroup_item_child_iv_head);
childViewHolder.tv_nickname = (TextView)view.findViewById(R.id.id_friendgroup_item_child_tv_nickname);
childViewHolder.tv_signature = (TextView)view.findViewById(R.id.id_friendgroup_item_child_tv_signature);
view.setTag(childViewHolder);
}else{
view = convertView;
childViewHolder = (ChildViewHolder)view.getTag();
}
Glide.with(context)
.load(WebUtil.HTTP_ADDRESS + friendItem.getUser_head_path())
.into(childViewHolder.iv_head);
childViewHolder.tv_nickname.setText(friendItem.getNickname());
childViewHolder.tv_signature.setText(friendItem.getSignature());
return view;
}
private class ParentViewHolder{
ImageView iv_expand;
TextView tv_friendgroup_name;
TextView tv_friend_count;
}
private class ChildViewHolder{
CircleImageView iv_head;
TextView tv_nickname;
TextView tv_signature;
}
@Override
public int getGroupCount() {
return list_friendgroupItem.size();
}
@Override
public int getChildrenCount(int parentPosition) {
return list_friendgroupItem.get(parentPosition).getList_friend().size();
}
@Override
public Object getGroup(int parengPosition) {
return list_friendgroupItem.get(parengPosition);
}
@Override
public Object getChild(int parentPosition, int childPosition) {
return list_friendgroupItem.get(parentPosition).getList_friend().get(childPosition);
}
@Override
public long getGroupId(int parentPosition) {
return parentPosition;
}
@Override
public long getChildId(int parentPosition, int childPosition) {
return childPosition;
}
@Override
public boolean hasStableIds() {
return false;
}
@Override
public boolean isChildSelectable(int i, int i1) {
return true;
}
}
继承自BaseExpandableListAdapter,重写里面几个方法, 看方法名就知道该方法是干什么的了,如果你熟悉ListView的话. 方法中很多都是成对存在的.根据方法名返回相应的值.重点就是getChildView()方法和getGroupView()方法;
@Override
public View getGroupView(int parentPosition, boolean isExpanded, View convertView, ViewGroup parent) {
}
@Override
public View getChildView(int parentPosition, int childPosition, boolean b, View convertView, ViewGroup parent) {
}
参数含义在上面已经标明了.
使用ExpandableListView
在布局文件中使用该控件
在代码中
expandableListView = (ExpandableListView)view.findViewById(R.id.id_contact_fg2_expandable_listview);
expandableListView.setGroupIndicator(null); //设置指示器隐藏
friendGroupItemExpandableBaseAdapter = new FriendGroupItemExpandableBaseAdapter(getActivity(),list_friendgroupItem);
expandableListView.setAdapter(friendGroupItemExpandableBaseAdapter);
//设置监听器
expandableListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
@Override
public boolean onChildClick(ExpandableListView expandableListView, View view, int parentPosition, int childPosition, long l) {
Intent intent = new Intent(getActivity(), UserDataDetailActivity.class);
intent.putExtra("username", list_friendgroupItem.get(parentPosition).getList_friend().get(childPosition).getUsername());
startActivity(intent);
return false;
}
});
效果图: