ExpandableListView的实现

最新推荐文章于 2023-07-11 16:24:29 发布

DHASA

最新推荐文章于 2023-07-11 16:24:29 发布

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分类专栏： android

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简单实现ExpandableListView：

主布局xml如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    xmlns:android="http://schemas.android.com/apk/res/android">
    <ExpandableListView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/lv4">
    </ExpandableListView>
</LinearLayout>

一级列表项布局xml如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal" 
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center_vertical"
    android:paddingLeft="15dp">
    <ImageView
        android:id="@+id/iv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:maxHeight="64dp"
        android:maxWidth="64dp"
        android:adjustViewBounds="true"/>
    <TextView
        android:id="@+id/tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="20sp"/>
</LinearLayout>

二级列表项布局xml如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center_vertical"
    android:paddingLeft="30dp">
    <ImageView
        android:id="@+id/iv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:maxHeight="32dp"
        android:maxWidth="32dp"
        android:adjustViewBounds="true"/>
    <TextView
        android:id="@+id/tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:paddingLeft="10dp"
        android:textSize="18sp"/>
</LinearLayout>

activity如下：

package com.example.dhasa.studydemo;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

public class Main4Activity extends Activity {

    private ExpandableListView  myExpandableListView;
    private String[] groups = {"我的好友","DHASA Company"};
    private String[][] children = {{"java","android","javascript","h5","css"},{"spring","struts","hibernate","mybatis"}};
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main4);
        myExpandableListView = (ExpandableListView) findViewById(R.id.lv4);
        myExpandableListView.setAdapter(new MyExpandableListViewAdapter());
        myExpandableListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
            @Override
            public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
                Toast.makeText(getApplicationContext(),children[groupPosition][childPosition],Toast.LENGTH_LONG).show();
                return true;
            }
        });
    }

    class MyExpandableListViewAdapter extends BaseExpandableListAdapter{

        @Override
        public int getGroupCount() {
            return groups.length;
        }

        @Override
        public int getChildrenCount(int groupPosition) {
            return children[groupPosition].length;
        }

        @Override
        public Object getGroup(int groupPosition) {
            return groups[groupPosition];
        }

        @Override
        public Object getChild(int groupPosition, int childPosition) {
            return children[groupPosition][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) {
            GViewHolder gViewHolder;
            if(convertView==null){
                convertView = getLayoutInflater().inflate(R.layout.list_group,null);
                gViewHolder = new GViewHolder();
                gViewHolder.iv1 = (ImageView) convertView.findViewById(R.id.iv);
                gViewHolder.tv1 = (TextView) convertView.findViewById(R.id.tv);
                convertView.setTag(gViewHolder);
            }else{
                gViewHolder = (GViewHolder) convertView.getTag();
            }
            gViewHolder.tv1.setText(groups[groupPosition]);
            gViewHolder.iv1.setImageResource(R.drawable.kakaxi);
            return convertView;
        }

        @Override
        public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
            CViewHoler cViewHoler;
            if(convertView==null){
                convertView = getLayoutInflater().inflate(R.layout.list_child,null);
                cViewHoler = new CViewHoler();
                cViewHoler.iv2 = (ImageView) convertView.findViewById(R.id.iv);
                cViewHoler.tv2 = (TextView) convertView.findViewById(R.id.tv);
                convertView.setTag(cViewHoler);
            }else{
                cViewHoler = (CViewHoler) convertView.getTag();
            }
            cViewHoler.iv2.setImageResource(R.drawable.aoteman);
            cViewHoler.tv2.setText(children[groupPosition][childPosition]);
            return convertView;
        }

        @Override
        public boolean isChildSelectable(int groupPosition, int childPosition) {
            return true;
        }

        class GViewHolder{
            ImageView iv1;
            TextView tv1;
        }

        class CViewHoler{
            ImageView iv2;
            TextView tv2;
        }
    }

}

上一次效果图吧：