Android中ExpandableListView控件基本使用

本文採用一个Demo来展示Android中ExpandableListView控件的使用，如怎样在组/子ListView中绑定数据源。直接上代码例如以下：

程序结构图：

layout文件夹下的 main.xml 文件源代码例如以下：

<?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">

    <!-- 我们会自定义listview的显示方式（在另外一个布局文件中边）不用默认的方式

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

    <!-- 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 , 假设这是为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源代码例如以下：

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、子列表加入数据

     * @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，程序执行后截图例如以下：