可展开列表ExpandableListView—BaseExpandableListAdapter

最新推荐文章于 2022-11-16 21:09:29 发布

路易斯睿齐

最新推荐文章于 2022-11-16 21:09:29 发布

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分类专栏： Android 文章标签： expandablelistview

本文链接：https://blog.youkuaiyun.com/RichieZhu/article/details/50906152

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这篇博客介绍了如何使用BaseExpandableListAdapter来创建一个可展开的列表ExpandableListView。内容包括aty和xml布局文件的设置，分别详细讲解了parent group和child的xml设计，并提供了demo的下载链接以及一个ExpandableListView嵌套GridView的参考文章。

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1.aty

package com.louis.louisexpandablelistviewdemo;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.ExpandableListView;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;


public class MainActivity extends AppCompatActivity {

    //定义父列表项List数据集合
    List<Map<String, Object>> parentMapList = new ArrayList<Map<String, Object>>();
    //定义子列表项List数据集合
    List<List<Map<String, Object>>> childMapList_list = new ArrayList<List<Map<String, Object>>>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initData();
        ExpandableListView expandableListView= (ExpandableListView) findViewById(R.id.id_elv);

    MyBaseExpandableListAdapter myBaseExpandableListAdapter=new MyBaseExpandableListAdapter(this,parentMapList,childMapList_list);
        expandableListView.setAdapter(myBaseExpandableListAdapter);




    }

    private void initData() {


        for (int i = 0; i < 15; i++) {
            //提供父列表的数据
            Map<String, Object> parentMap = new HashMap<String, Object>();
            parentMap.put("parentName", "parentName"+i);
            if (i%2==0) {
                parentMap.put("parentIcon", R.mipmap.ic_launcher);
            }else
            {
                parentMap.put("parentIcon", R.mipmap.louisgeek);
            }
            parentMapList.add(parentMap);
            //提供当前父列的子列数据
            List<Map<String, Object>> childMapList = new ArrayList<Map<String, Object>>();
            for (int j = 0; j < 10; j++) {
                Map<String, Object> childMap = new HashMap<String, Object>();
                childMap.put("childName", "parentName"+i+"下面的childName"+j);
                childMapList.add(childMap);
            }
            childMapList_list.add(childMapList);
        }
    }
}

xml 4 aty

<?xml version="1.0" encoding="utf-8"?>
<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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.louis.louisexpandablelistviewdemo.MainActivity">

    <ExpandableListView
        android:id="@+id/id_elv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@mipmap/channel_expandablelistview_bg"
        android:cacheColorHint="#00000000"
        android:divider="#ebebeb"
        android:groupIndicator="@null"
        android:dividerHeight="2dp"
        android:footerDividersEnabled="false"
        >

    </ExpandableListView>
</RelativeLayout>

3.xml 4 parent group

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/id_ll_parent"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="horizontal" >
    <!--记得去掉箭头图   在ExpandableListView中加入android:groupIndicator="@null" -->
   <!-- <View
        android:id="@+id/channel_line"
        android:layout_width="5dp"
        android:layout_height="20dp"
        android:layout_marginLeft="15dp"
        android:layout_gravity="center_vertical"
        android:background="#79BEF7" />-->
    <ImageView
        android:id="@+id/iv_img_parent"
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:layout_marginLeft="10dp"
        android:padding="2dp"
        />
    <TextView
        android:id="@+id/tv_title_parent"
        android:padding="10dp"
        android:layout_marginLeft="5dp"
        android:layout_toRightOf="@id/iv_img_parent"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
    <ImageView
        android:id="@+id/iv_img_parent_right"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_alignParentRight="true"
        android:layout_marginRight="20dp"
        />
</RelativeLayout>

5.xml 4 child

<?xml version="1.0" encoding="utf-8"?>
    <TextView xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/tv_items_child"
         android:padding="10dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" >
    </TextView>