喜欢显示好友QQ那样的列表，可以展开，可以收起，在android中，以往用的比较多的是listview，虽然可以实现列表的展示，但在某些情况下，我们还是希望用到可以分组并实现收缩的列表，那就要用到android的ExpandableListView，今天研究了一下这个的用法，也参考了很多资料动手写了一个小demo，实现了基本的功能，但界面优化方面做得还不够好，有待改进，素材采用了Q版三国杀武将的图片，很有爱哈哈，下面直接上效果图以及源代码~！

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main.xml的布局很简单啦，只是一个ExpandableListView 就OK了

但值得简单说下的是 android:cacheColorHint="#00000000"，这个设置可以去除拖动view时背景变成黑色的效果

android:listSelector="#00000000" ，可以去除选中时的***底色

 1 
 2  3     android:layout_width="fill_parent"
 4     android:layout_height="fill_parent"
 5     android:orientation="vertical" >
 6      7         android:id="@+id/list"
 8         android:layout_width="fill_parent"
 9         android:layout_height="fill_parent"
10         android:background="#ffffff"
11         android:cacheColorHint="#00000000"
12         android:listSelector="#00000000"
13         >
14   
15 
16

java代码：

package com.eyu.activity_test;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.AbsListView;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.ExpandableListView.OnChildClickListener;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

public class ExpandableList extends Activity{

    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.main);

        final ExpandableListAdapter adapter = new BaseExpandableListAdapter() {
            //设置组视图的图片
            int[] logos = new int[] { R.drawable.wei, R.drawable.shu,R.drawable.wu};
            //设置组视图的显示文字
            private String[] generalsTypes = new String[] { "魏", "蜀", "吴" };
            //子视图显示文字
            private String[][] generals = new String[][] {
                    { "夏侯惇", "甄姬", "许褚", "郭嘉", "司马懿", "杨修" },
                    { "马超", "张飞", "刘备", "诸葛亮", "黄月英", "赵云" },
                    { "吕蒙", "陆逊", "孙权", "周瑜", "孙尚香" }

            };
            //子视图图片
            public int[][] generallogos = new int[][] {
                    { R.drawable.xiahoudun, R.drawable.zhenji,
                            R.drawable.xuchu, R.drawable.guojia,
                            R.drawable.simayi, R.drawable.yangxiu },
                    { R.drawable.machao, R.drawable.zhangfei,
                            R.drawable.liubei, R.drawable.zhugeliang,
                            R.drawable.huangyueying, R.drawable.zhaoyun },
                    { R.drawable.lvmeng, R.drawable.luxun, R.drawable.sunquan,
                            R.drawable.zhouyu, R.drawable.sunshangxiang } };

            //自己定义一个获得文字信息的方法
            TextView getTextView() {
                AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
                        ViewGroup.LayoutParams.FILL_PARENT, 64);
                TextView textView = new TextView(
                        ExpandableList.this);
                textView.setLayoutParams(lp);
                textView.setGravity(Gravity.CENTER_VERTICAL);
                textView.setPadding(36, 0, 0, 0);
                textView.setTextSize(20);
                textView.setTextColor(Color.BLACK);
                return textView;
            }

            //重写ExpandableListAdapter中的各个方法
            @Override
            public int getGroupCount() {
                // TODO Auto-generated method stub
                return generalsTypes.length;
            }

            @Override
            public Object getGroup(int groupPosition) {
                // TODO Auto-generated method stub
                return generalsTypes[groupPosition];
            }

            @Override
            public long getGroupId(int groupPosition) {
                // TODO Auto-generated method stub
                return groupPosition;
            }

            @Override
            public int getChildrenCount(int groupPosition) {
                // TODO Auto-generated method stub
                return generals[groupPosition].length;
            }

            @Override
            public Object getChild(int groupPosition, int childPosition) {
                // TODO Auto-generated method stub
                return generals[groupPosition][childPosition];
            }

            @Override
            public long getChildId(int groupPosition, int childPosition) {
                // TODO Auto-generated method stub
                return childPosition;
            }

            @Override
            public boolean hasStableIds() {
                // TODO Auto-generated method stub
                return true;
            }

            @Override
            public View getGroupView(int groupPosition, boolean isExpanded,
                    View convertView, ViewGroup parent) {
                // TODO Auto-generated method stub
                LinearLayout ll = new LinearLayout(
                        ExpandableList.this);
                ll.setOrientation(0);
                ImageView logo = new ImageView(ExpandableList.this);
                logo.setImageResource(logos[groupPosition]);
                logo.setPadding(50, 0, 0, 0);
                ll.addView(logo);
                TextView textView = getTextView();
                textView.setTextColor(Color.BLACK);
                textView.setText(getGroup(groupPosition).toString());
                ll.addView(textView);

                return ll;
            }

            @Override
            public View getChildView(int groupPosition, int childPosition,
                    boolean isLastChild, View convertView, ViewGroup parent) {
                // TODO Auto-generated method stub
                LinearLayout ll = new LinearLayout(
                        ExpandableList.this);
                ll.setOrientation(0);
                ImageView generallogo = new ImageView(
                        ExpandableList.this);
                generallogo
                        .setImageResource(generallogos[groupPosition][childPosition]);
                ll.addView(generallogo);
                TextView textView = getTextView();
                textView.setText(getChild(groupPosition, childPosition)
                        .toString());
                ll.addView(textView);
                return ll;
            }

            @Override
            public boolean isChildSelectable(int groupPosition,
                    int childPosition) {
                // TODO Auto-generated method stub
                return true;
            }

        };

        ExpandableListView expandableListView = (ExpandableListView) findViewById(R.id.list);
        expandableListView.setAdapter(adapter);

        //设置item点击的监听器
        expandableListView.setOnChildClickListener(new OnChildClickListener() {

            @Override
            public boolean onChildClick(ExpandableListView parent, View v,
                    int groupPosition, int childPosition, long id) {

                Toast.makeText(
                        ExpandableList.this,
                        "你点击了" + adapter.getChild(groupPosition, childPosition),
                        Toast.LENGTH_SHORT).show();

                return false;
            }
        });
    }
}

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