Android_ExpandableListView

实现效果：类似于QQ联系人列表

相关属性：

android:childDivider：指定各组内子类表项之间的分隔条，图片不会完全显示，分离子列表项的是一条直线
android:childIndicator：显示在子列表旁边的Drawable对象，可以是一个图像
android:childIndicatorEnd：子列表项指示符的结束约束位置
android:childIndicatorLeft：子列表项指示符的左边约束位置
android:childIndicatorRight：子列表项指示符的右边约束位置
android:childIndicatorStart：子列表项指示符的开始约束位置
android:groupIndicator：显示在组列表旁边的Drawable对象，可以是一个图像
android:indicatorEnd：组列表项指示器的结束约束位置
android:indicatorLeft：组列表项指示器的左边约束位置
android:indicatorRight：组列表项指示器的右边约束位置
android:indicatorStart：组列表项指示器的开始约束位置

核心是重写BaseExpandableListAdpter

layout_item.xml

<?xml version="1.0" encoding="utf-8"?>

item_group.xml

<?xml version="1.0" encoding="utf-8"?>

mainActivity.xml

<?xml version="1.0" encoding="utf-8"?>

MyBaseExpandableListAdapter

package com.example.myapplication5.ExpandableView;import android.content.ClipData;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.example.myapplication5.R;import java.security.acl.Group;import java.util.ArrayList;public class MyBaseExpandableListAdapter extends BaseExpandableListAdapter {    private ArrayList gData;    private ArrayList> iData;    private Context mContext;    public MyBaseExpandableListAdapter(ArrayList gData, ArrayList> iData,Context mContext){        this.gData=gData;        this.iData=iData;        this.mContext=mContext;    }    @Override    public int getGroupCount() {        return gData.size();    }    @Override    public int getChildrenCount(int groupPosition) {        return iData.get(groupPosition).size();    }    @Override    public Object getGroup(int groupPosition) {        return gData.get(groupPosition);    }    @Override    public Object 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;    }    @Override    public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {        ViewHolderGroup viewHolderGroup;        if (convertView==null){            convertView= LayoutInflater.from(mContext).inflate(R.layout.layout_item_expanda_group,parent,false);            viewHolderGroup=new ViewHolderGroup();            viewHolderGroup.tv_g_name=convertView.findViewById(R.id.tv_group);            convertView.setTag(viewHolderGroup);        }else {            viewHolderGroup= (ViewHolderGroup) convertView.getTag();        }        viewHolderGroup.tv_g_name.setText(gData.get(groupPosition));        return convertView;    }    @Override    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {       ViewHolderItem viewHolderItem;       if (convertView==null){           convertView=LayoutInflater.from(mContext).inflate(R.layout.layout_item_expanda_item,parent,false);           viewHolderItem=new ViewHolderItem();           viewHolderItem.tv_it_name=convertView.findViewById(R.id.item_tv);           viewHolderItem.iv_it_head=convertView.findViewById(R.id.item_iv);           convertView.setTag(viewHolderItem);       }else {           viewHolderItem= (ViewHolderItem) convertView.getTag();       }       String[] strings=iData.get(groupPosition).get(childPosition);       viewHolderItem.tv_it_name.setText(strings[0]);        viewHolderItem.iv_it_head.setImageResource(Integer.parseInt(strings[1]));        return convertView;    }    @Override    public boolean isChildSelectable(int groupPosition, int childPosition) {        return true;    }    private static class ViewHolderGroup{        private TextView tv_g_name;    }    private static class ViewHolderItem{        private TextView tv_it_name;        private ImageView iv_it_head;    }}

　　MainActivity

package com.example.myapplication5.ExpandableView;import androidx.appcompat.app.AppCompatActivity;import android.content.ClipData;import android.content.Context;import android.os.Bundle;import android.widget.ExpandableListView;import com.example.myapplication5.R;import java.security.acl.Group;import java.util.ArrayList;public class ExpandableViewActivity extends AppCompatActivity {    private ArrayList gData=null;    private ArrayList> iData=null;    private ArrayList ldata=null;    private Context mcontext;    private ExpandableListView expandableListView;    private MyBaseExpandableListAdapter myAdapter = null;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_expandable_view);        expandableListView=findViewById(R.id.expad_view);        gData=new ArrayList();        iData=new ArrayList>();        ldata=new ArrayList();        gData.add("康师傅");        gData.add("今麦郎");        gData.add("上品");        ldata.add(new String[]{"红烧牛肉面",(""+R.drawable.sor)});        ldata.add(new String[]{"老坛酸菜牛肉面",(""+R.drawable.sor)});        iData.add(ldata);        ldata=new ArrayList<>();        ldata.add(new String[]{"西红柿鸡蛋打卤面",(""+R.drawable.sor)});        ldata.add(new String[]{"酸豆角牛肉面",(""+R.drawable.sor)});        iData.add(ldata);        ldata=new ArrayList<>();        ldata.add(new String[]{"香辣牛肉面",""+R.drawable.sor});        iData.add(ldata);        myAdapter=new MyBaseExpandableListAdapter(gData,iData,getApplicationContext());        expandableListView.setAdapter(myAdapter);    }}

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