ExpandableListView(可折叠列表)_Adapter适配器_Android
实现ExpandableAdapter的三种方式:
- 扩展BaseExpandableListAdpter实现ExpandableAdapter。
- 使用SimpleExpandableListAdpater将两个List集合包装成ExpandableAdapter
- 使用simpleCursorTreeAdapter将Cursor中的数据包装成SimpleCuroTreeAdapter
扩展BaseExpandableListAdpter实现ExpandableAdapter
重写isChildSelectable()方法需要返回true，不然不会触发子Item的点击事件
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="5dp"
tools:context=".MainActivity">
<ExpandableListView
android:id="@+id/exlist_lol"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:childDivider="#E02D2F" />
</RelativeLayout>
ExpandableListViewActivity
package com.ttit.helloworld;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.widget.ExpandableListView;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;
import com.ttit.helloworld.adapter.MExpandableListAdapter;
import com.ttit.helloworld.entity.Group;
import com.ttit.helloworld.entity.Item;
import java.util.ArrayList;
public class ExpandableListViewActivity extends AppCompatActivity {
private ArrayList<Group> gData = null;
private ArrayList<ArrayList<Item>> iData = null;
private ArrayList<Item> lData = null;
private Context mContext;
private ExpandableListView exlist_lol;
private MExpandableListAdapter myAdapter = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.expandablelistview_layout);
mContext = this;
exlist_lol = findViewById(R.id.exlist_lol);
//数据准备
gData = new ArrayList<Group>();
//所有的Item,数据
iData = new ArrayList<ArrayList<Item>>();
//创建组list,放组件
gData.add(new Group("AD"));
gData.add(new Group("AP"));
gData.add(new Group("TANK"));
lData = new ArrayList<Item>();
//AD组
lData.add(new Item(R.mipmap.iv_lol_icon3, "剑圣"));
lData.add(new Item(R.mipmap.iv_lol_icon4, "德莱文"));
lData.add(new Item(R.mipmap.iv_lol_icon13, "男枪"));
lData.add(new Item(R.mipmap.iv_lol_icon14, "韦鲁斯"));
iData.add(lData);
//AP组
lData = new ArrayList<Item>();
lData.add(new Item(R.mipmap.iv_lol_icon1, "提莫"));
lData.add(new Item(R.mipmap.iv_lol_icon7, "安妮"));
lData.add(new Item(R.mipmap.iv_lol_icon8, "天使"));
lData.add(new Item(R.mipmap.iv_lol_icon9, "泽拉斯"));
lData.add(new Item(R.mipmap.iv_lol_icon11, "狐狸"));
iData.add(lData);
//TANK组
lData = new ArrayList<Item>();
lData.add(new Item(R.mipmap.iv_lol_icon2, "诺手"));
lData.add(new Item(R.mipmap.iv_lol_icon5, "德邦"));
lData.add(new Item(R.mipmap.iv_lol_icon6, "奥拉夫"));
lData.add(new Item(R.mipmap.iv_lol_icon10, "龙女"));
lData.add(new Item(R.mipmap.iv_lol_icon12, "狗熊"));
iData.add(lData);
myAdapter = new MExpandableListAdapter(gData, iData, mContext);
exlist_lol.setAdapter(myAdapter);
//为列表设置点击事件
exlist_lol.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
@Override
public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
Toast.makeText(mContext, "你点击了：" + iData.get(groupPosition).get(childPosition).getiName(), Toast.LENGTH_SHORT).show();
return true;
}
});
}
}
MExpandableListAdapter
package com.ttit.helloworld.adapter;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import com.ttit.helloworld.R;
import com.ttit.helloworld.entity.Group;
import com.ttit.helloworld.entity.Item;
import java.util.ArrayList;
public class MExpandableListAdapter extends BaseExpandableListAdapter {//继承BaseExpandableListAdapter
private ArrayList<Group> gData;
private ArrayList<ArrayList<Item>> iData;
private Context mContext;
public MExpandableListAdapter(ArrayList<Group> gData, ArrayList<ArrayList<Item>> iData, Context mContext) {
this.gData = gData;
this.iData = iData;
this.mContext = mContext;
}
//组的数量
@Override
public int getGroupCount() {
return gData.size();
}
@Override
public int getChildrenCount(int groupPosition) {
return iData.get(groupPosition).size();
}
@Override
public Group getGroup(int groupPosition) {
return gData.get(groupPosition);
}
@Override
public Item getChild(int groupPosition, int childPosition) {
return iData.get(groupPosition).get(childPosition);
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
@Override
public boolean hasStableIds() {
return false;
}
//取得用于显示给定分组的视图. 这个方法仅返回分组的视图对象
@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
ViewHolderGroup groupHolder;
if (convertView == null) {
//设置组的页面
convertView = LayoutInflater.from(mContext).inflate(
R.layout.item_exlist_group, parent, false);
groupHolder = new ViewHolderGroup();
groupHolder.tv_group_name = (TextView) convertView.findViewById(R.id.tv_group_name);
convertView.setTag(groupHolder);
} else {
groupHolder = (ViewHolderGroup) convertView.getTag();
}
groupHolder.tv_group_name.setText(gData.get(groupPosition).getgName());
return convertView;
}
//取得显示给定分组给定子位置的数据用的视图
@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
ViewHolderItem itemHolder;
if (convertView == null) {
//设置一个子组件页面
convertView = LayoutInflater.from(mContext).inflate(
R.layout.item_exlist_item, parent, false);
itemHolder = new ViewHolderItem();
itemHolder.img_icon = (ImageView) convertView.findViewById(R.id.img_icon);
itemHolder.tv_name = (TextView) convertView.findViewById(R.id.tv_name);
convertView.setTag(itemHolder);
} else {
itemHolder = (ViewHolderItem) convertView.getTag();
}
itemHolder.img_icon.setImageResource(iData.get(groupPosition).get(childPosition).getiId());
itemHolder.tv_name.setText(iData.get(groupPosition).get(childPosition).getiName());
return convertView;
}
//todo 设置子列表是否可选中,必须设置为true
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
//组对象
private static class ViewHolderGroup {
private TextView tv_group_name;
}
//组内一个组件对象
private static class ViewHolderItem {
private ImageView img_icon;
private TextView tv_name;
}
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:padding="5dp">
<TextView
android:id="@+id/tv_group_name"
android:layout_width="match_parent"
android:layout_height="56dp"
android:gravity="center_vertical"
android:paddingLeft="30dp"
android:text="AP"
android:textStyle="bold"
android:textSize="20sp" />
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:padding="5dp"
android:background="#6BBA79">
<ImageView
android:id="@+id/img_icon"
android:layout_width="48dp"
android:layout_height="48dp"
android:src="@mipmap/iv_lol_icon1"
android:focusable="false"/>
<TextView
android:id="@+id/tv_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="15dp"
android:layout_marginTop="15dp"
android:focusable="false"
android:text="提莫"
android:textSize="18sp" />
</LinearLayout>