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：