关于ExpandableListView的一个小例子

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~！

          
        

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" ，可以去除选中时的黄色底色

1 <?xml version="1.0" encoding="utf-8"?>

 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

 3     android:layout_width="fill_parent"

 4     android:layout_height="fill_parent"

 5     android:orientation="vertical" >

 6     <ExpandableListView 

 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     </ExpandableListView> 

15 </LinearLayout>  

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;

            }

        });

    }

}