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>