仿QQ好友列表 ExpandableListView

仿QQ好友列表的效果图

xml页面

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"              android:orientation="vertical"              android:layout_width="match_parent"              android:layout_height="match_parent">    <!--运用：如：QQ列表-->    <ExpandableListView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:id="@+id/expandablelistview_1"></ExpandableListView></LinearLayout>

Java代码

package com.example.app11;import android.database.DataSetObserver;import android.os.Bundle;import android.support.annotation.Nullable;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.ExpandableListAdapter;import android.widget.ExpandableListView;import android.widget.ImageView;import android.widget.LinearLayout;import android.widget.TextView;/** * Created by Administrator on 2017/6/8 0008. */public class ExpandableListViewActivity extends AppCompatActivity {    private ExpandableListView expandableListView;    @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.expandablelistview);        expandableListView = (ExpandableListView) findViewById(R.id.expandablelistview_1);        expandable expandable=new expandable();        expandableListView.setAdapter(expandable);    }    class expandable implements ExpandableListAdapter {        int logals[] = {R.drawable.dog, R.drawable.elephant, R.drawable.fish};        String names[] = {"狗", "象", "鱼"};        String content[][] = {{"狗1", "狗2", "狗3"}, {"象1", "象2", "象3"}, {"鱼1", "鱼2", "鱼3"}};        @Override        public void registerDataSetObserver(DataSetObserver observer) {        }        @Override        public void unregisterDataSetObserver(DataSetObserver observer) {        }        @Override        public int getGroupCount() {            return names.length;        }        @Override        public int getChildrenCount(int groupPosition) {            return content[groupPosition].length;        }        @Override        public Object getGroup(int groupPosition) {            return names[groupPosition];        }        @Override        public Object getChild(int groupPosition, int childPosition) {            return content[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 true;        }        @Override        public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {            LinearLayout ll = new LinearLayout(ExpandableListViewActivity.this);            ll.setOrientation(LinearLayout.HORIZONTAL);            ImageView logo = new ImageView(ExpandableListViewActivity.this);            logo.setImageResource(logals[groupPosition]);            logo.setPadding(36, 15, 0, 0);            ll.addView(logo);            TextView textView=getTextView();            textView.setText(getGroup(groupPosition).toString());            textView.setPadding(10,0,0,0);            ll.addView(textView);            return ll;        }        @Override        public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {            TextView textView=getTextView();            textView.setText(getChild(groupPosition,childPosition).toString());            return textView;        }        @Override        public boolean isChildSelectable(int groupPosition, int childPosition) {            return true;        }        @Override        public boolean areAllItemsEnabled() {            return false;        }        @Override        public boolean isEmpty() {            return false;        }        @Override        public void onGroupExpanded(int groupPosition) {        }        @Override        public void onGroupCollapsed(int groupPosition) {        }        @Override        public long getCombinedChildId(long groupId, long childId) {            return 0;        }        @Override        public long getCombinedGroupId(long groupId) {            return 0;        }        private TextView getTextView() {            AbsListView.LayoutParams lp = new AbsListView.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, 64);            TextView textView = new TextView(ExpandableListViewActivity.this);            textView.setLayoutParams(lp);            textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);            textView.setPadding(36, 0, 0, 0);            textView.setTextSize(20);            return textView;        }    }}