ExpandableListView 雙層list view的使用案例

如果涉及和list view  ScrollView等的嵌套使用 可以看上篇 https://blog.csdn.net/qq_36355271/article/details/86471957

首先上圖看效果

 布局：此處我使用的是自定義的（因為我嵌套ScrollView）你可以直接使用ExpandableListView

<view.expandableListView.NestedExpandaleListView
    android:id="@+id/expend_list"
    android:layoutDirection="rtl"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

</view.expandableListView.NestedExpandaleListView>
           

第一層item：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">
    <TextView
        android:id="@+id/label_group_normal"
        android:gravity="left|center_vertical"
        android:layoutDirection="ltr"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#faf4f4"
        android:paddingBottom="8dp"
        android:paddingLeft="32dp"
        android:paddingTop="8dp"
        android:textColor="#727272"
        android:textSize="20sp"
        tools:text="測試資料"/>

</LinearLayout>
           

第二層itme

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">
    <TextView
        android:id="@+id/expand_child"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:textSize="16sp"
        android:paddingTop="8dp"
        android:paddingBottom="8dp"
        tools:text="測試資料"/>

</LinearLayout>
           

注：從最上面的圖可以看出 我的清單下拉圖示在右邊  預設的在左邊  如何實作的呢？

認真看上面的代碼會發現 

android:layoutDirection="rtl" //整體靠右   例  3，2，1

和

 android:layoutDirection="ltr"//整體靠左  例  1，2，3

activity中的執行個體使用及監聽

@BindView(R.id.expend_list)
NestedExpandaleListView expend_list;
ApplyExtendableListViewAdapter expandableAdapter;
           

expandableAdapter=new ApplyExtendableListViewAdapter();
        expend_list.setAdapter(expandableAdapter); //設定分組的監聽
//        setListViewHeight(expend_list);
        expend_list.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
            @Override
            public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {
                toast_Base(""+groupPosition);
                expandableAdapter.notifyDataSetChanged();
//                setListViewHeight(expend_list);
                return false;
            }
        }); //設定子項布局監聽
        expend_list.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
            @Override
            public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition,   long id) {
                toast_Base(groupPosition+""+childPosition);
                return true;
            }
        });
           

Adapter 擴充卡：

package adapter;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.TextView;

import com.example.administrator.hospitalproject.R;

/**
 * Created by Administrator on 2019/1/14.
 */

public class ApplyExtendableListViewAdapter extends BaseExpandableListAdapter {
    private Context mcontext;
    public String[] groupString = {"21", "23", "34", "45"};
    public String[][] childString = { {"12", "23", "34", "45"}, {"56", "67", "78", "89"}, {"90", "87", "67", "43"}, {"32", "21", "34", "34"} };
    @Override // 擷取分組的個數
    public int getGroupCount() {
        return groupString.length;
    } //擷取指定分組中的子選項的個數
    @Override
    public int getChildrenCount(int groupPosition) {
        return childString[groupPosition].length;
    } //        擷取指定的分組資料
    @Override public Object getGroup(int groupPosition) {
        return groupString[groupPosition];
    }  //擷取指定分組中的指定子選項資料
    @Override
    public Object getChild(int groupPosition, int childPosition) {
        return childString[groupPosition][childPosition];
    } //擷取指定分組的ID, 這個ID必須是唯一的
    @Override
    public long getGroupId(int groupPosition) {
        return groupPosition;
    } //擷取子選項的ID, 這個ID必須是唯一的
    @Override public long getChildId(int groupPosition, int childPosition) {
        return childPosition;
    }  //分組和子選項是否持有穩定的ID, 就是說底層資料的改變會不會影響到它們
    @Override public boolean hasStableIds() {
        return true;
    }
    /**
 *
         * 擷取顯示指定組的視圖對象
 *
         * @param groupPosition 組位置
 * @param isExpanded 該組是展開狀态還是伸縮狀态
 * @param convertView 重用已有的視圖對象
 * @param parent 傳回的視圖對象始終依附于的視圖組
  */ // 擷取顯示指定分組的視圖
   @Override
   public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
       GroupViewHolder groupViewHolder;
       if (convertView == null){
           convertView = LayoutInflater.from(parent.getContext()).inflate(R.layout.partent_item,parent,false);

           groupViewHolder = new GroupViewHolder();
           groupViewHolder.tvTitle = (TextView)convertView.findViewById(R.id.label_group_normal);
           convertView.setTag(groupViewHolder);
       }else {
           groupViewHolder = (GroupViewHolder)convertView.getTag();
       }
       groupViewHolder.tvTitle.setText(groupString[groupPosition]);
       return convertView;
   }

       /**
          *
          * 擷取一個視圖對象，顯示指定組中的指定子元素資料。
            *
            * @param groupPosition 組位置
     * @param childPosition 子元素位置
     * @param isLastChild 子元素是否處于組中的最後一個
     * @param convertView 重用已有的視圖(View)對象
     * @param parent 傳回的視圖(View)對象始終依附于的視圖組
     * @return
             * @see android.widget.ExpandableListAdapter#getChildView(int, int, boolean, android.view.View,
     *      android.view.ViewGroup)
     */ //取得顯示給定分組給定子位置的資料用的視圖
    @Override
    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
        ChildViewHolder childViewHolder;
        if (convertView==null){
            convertView = LayoutInflater.from(parent.getContext()).inflate(R.layout.child_item,parent,false);
            childViewHolder = new ChildViewHolder();
            childViewHolder.tvTitle = (TextView)convertView.findViewById(R.id.expand_child);
            convertView.setTag(childViewHolder);
        }else {
            childViewHolder = (ChildViewHolder) convertView.getTag();
        }
        childViewHolder.tvTitle.setText(childString[groupPosition][childPosition]);
        return convertView;
    } //指定位置上的子元素是否可選中
    @Override public boolean isChildSelectable(int groupPosition, int childPosition) {
        return true;
    }

    static class GroupViewHolder {
        TextView tvTitle;
    }
    static class ChildViewHolder {
        TextView tvTitle;
    }
}


           

相信大家能看得懂，個人看法筆記  如有錯誤歡迎留言斧正