完美实现ExpandableListView二级分栏效果
本文实例为大家分享了ExpandableListView二级分栏效果的具体代码，供大家参考，具体内容如下
对ExpandableListView控件进行封装（未自定义）直接上代码：
通用ViewHolder类，仅在setImageResource中添加代码
package com.svp.haoyan.expandablelistview.tool;
import android.content.Context;
import android.graphics.Bitmap;
import android.util.SparseArray;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
/**
* Created by haoyan on 2016/3/24.
*/
public class ViewHolder {
//存储数据
private SparseArray<View> mViews;
private int mPosition;
private View mConvertView;
private boolean misExpanded;
public ViewHolder(Context context, ViewGroup parent, int layoutId, int position,boolean isExpanded) {
this.mPosition=position;
this.mViews= new SparseArray<View>();
this.misExpanded=isExpanded;
//三
mConvertView= LayoutInflater.from(context).inflate(layoutId,parent,false);
//一
mConvertView.setTag(this);
}
public static ViewHolder get(Context context,View convertView,
ViewGroup parent,int layoutId,int position,boolean isExpanded){
if (convertView==null){
return new ViewHolder(context,parent,layoutId,position,isExpanded);
}else {
//五 六
ViewHolder holder=(ViewHolder)convertView.getTag();
holder.mPosition=position;
return holder;
}
}
//通过viewId获取控件
//泛型T返回子类
public <T extends View> T getView(int viewId){
View view =mViews.get(viewId);
if (view==null){
//四
view=mConvertView.findViewById(viewId);
mViews.put(viewId,view);
}
return (T)view;
}
//八
public View getmConvertView() {
return mConvertView;
}
/**
* 设置TextView的值
* @param viewId
* @param text
* @return
*/
//四 七 九
public ViewHolder setText(int viewId,String text){
TextView tv= getView(viewId);
tv.setText(text);
return this;
}
/**
* 一参传id，二参传图片地址，三参为true则调用点击变化效果，默认为false.
* */
public ViewHolder setImageResource(int viewId,int resId,boolean expanded){
ImageView view= getView(viewId);
view.setImageResource(resId);
if (expanded){
if (misExpanded){
view.setVisibility(View.GONE);
}else {
view.setVisibility(View.VISIBLE);
}
}
return this;
}
public ViewHolder setImageBitamp(int viewId,Bitmap bitmap){
ImageView view= getView(viewId);
view.setImageBitmap(bitmap);
return this;
}
public ViewHolder setImageURI(int viewId,String uri){
ImageView view= getView(viewId);
// Imageloader.getInstance().loadImg(view,uri);
return this;
}
}
实体类Expand_DTO:
package com.svp.haoyan.expandablelistview.dto;
/**
* Created by haoyan on 2016/5/7.
*/
public class Expand_DTO {
private String name;
private String contents;
private int pic;
private int photo;
public static class Expand_child {
private String childname;
private String childcont;
public String getChildname() {
return childname;
}
public void setChildname(String childname) {
this.childname = childname;
}
public String getChildcont() {
return childcont;
}
public void setChildcont(String childcont) {
this.childcont = childcont;
}
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getContents() {
return contents;
}
public void setContents(String contents) {
this.contents = contents;
}
public int getPic() {
return pic;
}
public void setPic(int pic) {
this.pic = pic;
}
public int getPhoto() {
return photo;
}
public void setPhoto(int photo) {
this.photo = photo;
}
}
接下来是最主要的Adapter：
package com.svp.haoyan.expandablelistview;
import android.content.Context;
import android.database.DataSetObserver;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ExpandableListAdapter;
import com.svp.haoyan.expandablelistview.tool.ViewHolder;
import java.util.List;
import java.util.Map;
/**
* Created by haoyan on 2016/4/28.
*/
public abstract class MyExpandableListAdapter<T,F>implements ExpandableListAdapter {
private Context mcontext;
private List<T> mexpand_dtos;
private Map<Integer, List<F>> mmap = null;
public MyExpandableListAdapter(Context context, List<T> expand_dtos,Map<Integer, List<F>> map) {
this.mcontext = context;
this.mexpand_dtos = expand_dtos;
this.mmap=map;
}
/*注册一个观察者(observer)，当此适配器数据修改时即调用此观察者。*/
@Override
public void registerDataSetObserver(DataSetObserver observer) {
}
/*取消先前通过registerDataSetObserver(DataSetObserver)方式注册进该适配器中的观察者对象*/
@Override
public void unregisterDataSetObserver(DataSetObserver observer) {
}
/*获取组的个数*/
@Override
public int getGroupCount() {
return mexpand_dtos.size();
}
/*返回在指定Group的Child数目。*/
@Override
public int getChildrenCount(int groupPosition) {
return mmap.get(groupPosition).size();
}
//获取当前父item的数据
@Override
public T getGroup(int groupPosition) {
return mexpand_dtos.get(groupPosition);
}
/*获取与在指定group给予child相关的数据。*/
@Override
public F getChild(int groupPosition, int childPosition) {
return (mmap.get(groupPosition).get(childPosition));
}
/*获取指定组的ID*/
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
//得到子item的ID
@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
//组和子元素是否持有稳定的ID,也就是底层数据的改变不会影响到它们。(没效果)
@Override
public boolean hasStableIds() {
return true;
}
//设置父item组件
@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
ViewHolder viewHolder = ViewHolder.get(mcontext, convertView, parent, R.layout.expand_groupview, groupPosition,isExpanded);
convert(viewHolder, getGroup(groupPosition));
return viewHolder.getmConvertView();
}
//自己写
public abstract void convert(ViewHolder viewHolder, T t);
public abstract void convertchild(ViewHolder viewHolder, F f);
//设置子item的组件
@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
ViewHolder viewHolder = ViewHolder.get(mcontext, convertView, parent, R.layout.expand_childview, groupPosition,isLastChild);
convertchild(viewHolder, getChild(groupPosition,childPosition));
return viewHolder.getmConvertView();
/*子元素是否处于组中的最后一个(对每个组的最后一个进行操作)*/
//boolean isLastChild
/*下边是未封装代码，提供参考*/
// String Childname = (mmap.get(groupPosition).get(childPosition)).getChildname();
// LayoutInflater inflater = (LayoutInflater)mcontext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
// convertView = inflater.inflate(R.layout.expand_childview, null);
// TextView tv_child = (TextView) convertView.findViewById(R.id.tv_child);
// tv_child.setText(Childcont);
}
/*是否选中指定位置上的子元素。*/
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
/*true所有条目可以选择和点击*/
@Override
public boolean areAllItemsEnabled() {
return false;
}
/*如果当前适配器不包含任何数据则返回True。经常用来决定一个空视图是否应该被显示。
一个典型的实现将返回表达式getCount() == 0的结果，但是由于getCount()包含了头部和尾部，适配器可能需要不同的行为。*/
@Override
public boolean isEmpty() {
return false;
}
/*当组展开状态的时候此方法被调用。*/
@Override
public void onGroupExpanded(int groupPosition) {
}
/*当组收缩状态的时候此方法被调用。*/
@Override
public void onGroupCollapsed(int groupPosition) {
}
/*根据所给的子ID号和组ID号返回唯一的ID。此外，若hasStableIds()是true，那么必须要返回稳定的ID。*/
@Override
public long getCombinedChildId(long groupId, long childId) {
return 0;
}
/*同上*/
@Override
public long getCombinedGroupId(long groupId) {
return 0;
}
}
最后是调用类Activity:
package com.svp.haoyan.expandablelistview;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.ExpandableListView;
import com.svp.haoyan.expandablelistview.dto.Expand_DTO;
import com.svp.haoyan.expandablelistview.tool.ViewHolder;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private ExpandableListView elistview;
private List<Expand_DTO> expanddata;
private HashMap<Integer, List<Expand_DTO.Expand_child>> map = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
dataView();
expandView();
}
private void expandView() {
elistview = (ExpandableListView) findViewById(R.id.expandable_lv);
elistview.setAdapter(new MyExpandableListAdapter<Expand_DTO,Expand_DTO.Expand_child>(this, expanddata,map) {
@Override
public void convert(ViewHolder viewHolder, Expand_DTO expand_dto) {
viewHolder.setText(R.id.tv_expand, expand_dto.getName())
.setText(R.id.tv_expand_two, expand_dto.getContents())
.setImageResource(R.id.img_expand, expand_dto.getPic(),false)
.setImageResource(R.id.img_expand_two, expand_dto.getPhoto(),false);
}
@Override
public void convertchild(ViewHolder viewHolder, Expand_DTO.Expand_child expand_child) {
viewHolder.setText(R.id.tv_child,expand_child.getChildname())
.setText(R.id.tv_child2,expand_child.getChildcont());
}
});
//去掉自带箭头
elistview.setGroupIndicator(null);
}
private void dataView() {
expanddata = new ArrayList<Expand_DTO>();
Expand_DTO bean_zero = new Expand_DTO();
bean_zero.setName("android新技能1");
bean_zero.setContents("1");
bean_zero.setPic(R.drawable.icon_check);
bean_zero.setPhoto(R.drawable.travel_airfare_cn_position);
expanddata.add(bean_zero);
Expand_DTO bean_one = new Expand_DTO();
bean_one.setName("android新技能2");
bean_one.setContents("2");
bean_one.setPic(R.drawable.icon_check);
bean_one.setPhoto(R.drawable.travel_airfare_cn_position);
expanddata.add(bean_one);
Expand_DTO bean_two = new Expand_DTO();
bean_two.setName("android新技能3");
bean_two.setContents("3");
bean_two.setPic(R.drawable.icon_check);
bean_two.setPhoto(R.drawable.travel_airfare_cn_position);
expanddata.add(bean_two);
//这里可以使用SparseArray优化性能
map = new HashMap<Integer, List<Expand_DTO.Expand_child>>();
List<Expand_DTO.Expand_child> expand_children_zero=new ArrayList<Expand_DTO.Expand_child>();
Expand_DTO.Expand_child child1=new Expand_DTO.Expand_child();
child1.setChildname("11111");
child1.setChildcont("22222");
expand_children_zero.add(child1);
Expand_DTO.Expand_child child2=new Expand_DTO.Expand_child();
child2.setChildname("3333333");
child2.setChildcont("4444444");
expand_children_zero.add(child2);
map.put(0,expand_children_zero);
List<Expand_DTO.Expand_child> expand_children_one=new ArrayList<Expand_DTO.Expand_child>();
Expand_DTO.Expand_child child3=new Expand_DTO.Expand_child();
child3.setChildname("55555");
child3.setChildcont("66666");
expand_children_one.add(child3);
Expand_DTO.Expand_child child4=new Expand_DTO.Expand_child();
child4.setChildname("77777");
child4.setChildcont("88888");
expand_children_one.add(child4);
map.put(1,expand_children_one);
List<Expand_DTO.Expand_child> children_data_two=new ArrayList<Expand_DTO.Expand_child>();
Expand_DTO.Expand_child child5=new Expand_DTO.Expand_child();
child5.setChildname("99999");
child5.setChildcont("00000");
children_data_two.add(child5);
Expand_DTO.Expand_child child6=new Expand_DTO.Expand_child();
child6.setChildname("12345");
child6.setChildcont("54321");
children_data_two.add(child6);
map.put(2,children_data_two);
}
}
完活布局很简单就不贴出来了，加上图片有图有真相：
源码下载：ExpandableListView二级分栏效果
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