ExpandableListView扩展下拉列表

MainActivity.java

package com.cccrunner.csdn.myapplication1;

import android.graphics.Color;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

/**
 * @author 王德强 
 * 功能：ExpandableListView扩展下拉列表
 */

public class MainActivity extends AppCompatActivity {

    String[] type = new String[]{"我的好友","大学同学","亲戚朋友"};
    String[][] info = new String[][]{{"张三","张思","王五"},{"李四","李斯"},{"王五","王六","王二","王三"}};
    int[] groupImgs = new int[]{R.drawable.g1,R.drawable.g2,R.drawable.g3};
    int[][] imgIds = new int[][]{{R.drawable.a1,R.drawable.a2,R.drawable.a3},
            {R.drawable.a4,R.drawable.a5,R.drawable.a6},
            {R.drawable.a7,R.drawable.a8,R.drawable.a9,R.drawable.a10}

    };
    ExpandableListAdapter myAdapter = new BaseExpandableListAdapter() {
        @Override
        public int getGroupCount() {
            return type.length;
        }
        private TextView getTextView(){//自己定义的一个获取TextView的方法
            AbsListView.LayoutParams lp = new AbsListView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
                    ViewGroup.LayoutParams.WRAP_CONTENT); //设置宽度和高度
            TextView textView = new TextView(MainActivity.this);
            textView.setLayoutParams(lp);
            textView.setGravity(Gravity.CENTER_VERTICAL);
            textView.setTextSize(20);
            textView.setPadding(30,0,0,0);
            textView.setTextColor(Color.BLACK);
            return textView;
        }
        @Override
        public int getChildrenCount(int groupPosition) {
            return info[groupPosition].length;
        }

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

        @Override
        public Object getChild(int groupPosition, int childPosition) {
            return info[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) {
            LinearLayout layout =  new LinearLayout(MainActivity.this);
            layout.setOrientation(LinearLayout.HORIZONTAL);
            layout.setGravity(Gravity.CENTER_VERTICAL);
            ImageView groupImg = new ImageView(MainActivity.this);
            groupImg.setImageResource(groupImgs[groupPosition]);
            layout.addView(groupImg);
            TextView textView = getTextView();
            textView.setText(getGroup(groupPosition).toString());
            layout.addView(textView);
            return layout;
        }

        @Override
        public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
           LinearLayout layout = new LinearLayout(MainActivity.this);
            layout.setOrientation(LinearLayout.HORIZONTAL);
            layout.setPadding(20,0,0,0);
            ImageView itemImage = new ImageView(MainActivity.this);
            itemImage.setPadding(20,0,0,0);
            itemImage.setImageResource(imgIds[groupPosition][childPosition]);
            layout.addView(itemImage);
            TextView textView = getTextView();
            textView.setText(getChild(groupPosition,childPosition).toString());
            layout.addView(textView);
            return layout;
        }
        //子项是否可以选择
        @Override
        public boolean isChildSelectable(int groupPosition, int childPosition) {
            return true;
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ExpandableListView myExpandable = (ExpandableListView) findViewById(R.id.myExpandable);
        myExpandable.setAdapter(myAdapter);
    }
}

activity_main.xml

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

</ExpandableListView>
</LinearLayout>