Android中ExpandableListView控件基本使用

   本文采用一个Demo来展示Android中ExpandableListView控件的使用，如如何在组/子ListView中绑定数据源。直接上代码如下：

程序结构图：



layout目录下的 main.xml 文件源码如下：

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

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

    android:orientation="vertical"  

    android:layout_width="fill_parent"  

    android:layout_height="fill_parent">  

    <!-- 我们会自己定义listview的显示方式（在另外一个布局文件里边）不用默认的方式   

         如果自定义listview的显示方式这里这个android:id="@id/android:list" 必须
4000
这样写 -->  

    <!-- android:drawSelectOnTop="false"此属性用来设置listview上的背景颜色会不会  

     挡住（覆盖）内容 , 如果这是为false就表示不会覆盖掉 -->   

    <ExpandableListView   

        android:id="@id/android:list"                 

        android:layout_width="fill_parent"                  

        android:layout_height="wrap_content"                

        android:layout_weight="1"                 

        android:drawSelectorOnTop="false"/>   

</LinearLayout>  

包 com.andyidea.demo中ContactsActivity.java源码如下：

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package com.andyidea.demo;  

  

import java.util.ArrayList;  

import java.util.List;  

  

import android.app.ExpandableListActivity;  

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.TextView;  

  

public class ContactsActivity extends ExpandableListActivity {  

      

    List<String> group;           //组列表  

    List<List<String>> child;     //子列表  

    ContactsInfoAdapter adapter;  //数据适配器  

      

    /** Called when the activity is first created. */  

    @Override  

    public void onCreate(Bundle savedInstanceState) {  

        super.onCreate(savedInstanceState);  

        requestWindowFeature(Window.FEATURE_NO_TITLE);  //设置为无标题  

        setContentView(R.layout.main);  

        getExpandableListView().setBackgroundResource(R.drawable.default_bg);  

          

        initializeData();  

        getExpandableListView().setAdapter(new ContactsInfoAdapter());  

        getExpandableListView().setCacheColorHint(0);  //设置拖动列表的时候防止出现黑色背景  

    }  

      

    /**  

     * 初始化组、子列表数据  

     */  

    private void initializeData(){  

        group = new ArrayList<String>();  

        child = new ArrayList<List<String>>();  

          

        addInfo("Andy",new String[]{"male","138123***","GuangZhou"});  

        addInfo("Fairy",new String[]{"female","138123***","GuangZhou"});  

        addInfo("Jerry",new String[]{"male","138123***","ShenZhen"});  

        addInfo("Tom",new String[]{"female","138123***","ShangHai"});  

        addInfo("Bill",new String[]{"male","138231***","ZhanJiang"});  

          

    }  

      

    /**  

     * 模拟给组、子列表添加数据  

     * @param g-group  

     * @param c-child  

     */  

    private void addInfo(String g,String[] c){  

        group.add(g);  

        List<String> childitem = new ArrayList<String>();  

        for(int i=0;i<c.length;i++){  

            childitem.add(c[i]);  

        }  

        child.add(childitem);  

    }  

      

    class ContactsInfoAdapter extends BaseExpandableListAdapter{  

  

          

        //-----------------Child----------------//  

        @Override  

        public Object getChild(int groupPosition, int childPosition) {  

            return child.get(groupPosition).get(childPosition);  

        }  

          

        @Override  

        public long getChildId(int groupPosition, int childPosition) {  

            return childPosition;  

        }  

          

        @Override  

        public int getChildrenCount(int groupPosition) {  

            return child.get(groupPosition).size();  

        }  

          

        @Override  

        public View getChildView(int groupPosition, int childPosition,  

                boolean isLastChild, View convertView, ViewGroup parent) {  

            String string = child.get(groupPosition).get(childPosition);   

            return getGenericView(string);  

        }  

          

        //----------------Group----------------//  

        @Override  

        public Object getGroup(int groupPosition) {  

            return group.get(groupPosition);  

        }                 

  

        @Override  

        public long getGroupId(int groupPosition) {  

            return groupPosition;  

        }     

          

        @Override  

        public int getGroupCount() {  

            return group.size();  

        }     

          

        @Override  

        public View getGroupView(int groupPosition, boolean isExpanded,  

                View convertView, ViewGroup parent) {  

            String string = group.get(groupPosition);    

            return getGenericView(string);  

        }  

  

        //创建组/子视图    

        public TextView getGenericView(String s) {    

            // Layout parameters for the ExpandableListView    

            AbsListView.LayoutParams lp = new AbsListView.LayoutParams(    

                    ViewGroup.LayoutParams.FILL_PARENT, 40);  

    

            TextView text = new TextView(ContactsActivity.this);    

            text.setLayoutParams(lp);    

            // Center the text vertically    

            text.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);    

            // Set the text starting position    

            text.setPadding(36, 0, 0, 0);    

                

            text.setText(s);    

            return text;    

        }    

          

          

        @Override  

        public boolean hasStableIds() {  

            // TODO Auto-generated method stub  

            return false;  

        }         

  

        @Override  

        public boolean isChildSelectable(int groupPosition, int childPosition) {  

            // TODO Auto-generated method stub  

            return true;  

        }  

          

    }  

}  

最后，程序运行后截图如下：