学步园

本例说明:

实现QQ中"未分组"效果和"未分组"不可编辑删除功能.

注:本文数据库处理使用框架AHibernate,可以灵活操作sqlite数据库,

详见: http://blog.csdn.net/lk_blog/article/details/7455992

本文只介绍主要部分,更多细节看上一篇博客:http://blog.csdn.net/lk_blog/article/details/7562987

效果图:

主要代码:

修改studentDaoImpl:

package com.tgb.lk.demo.dao.impl;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import com.tgb.lk.ahibernate.dao.impl.BaseDaoImpl;
import com.tgb.lk.demo.dao.StudentDao;
import com.tgb.lk.demo.model.Student;
import com.tgb.lk.demo.util.DBHelper;
import com.tgb.lk.demo.util.GroupChild;

import android.content.Context;

//本文数据库处理引用jar包AHibernate处理.
//AHibernate的详细使用教程示例地址: http://blog.csdn.net/lk_blog/article/details/7455992
//AHibernate源码交流地址: http://blog.csdn.net/lk_blog/article/details/7456125
//AHibernate jar包下载及源代码下载地址: http://download.csdn.net/detail/lk_blog/4222048
public class StudentDaoImpl extends BaseDaoImpl<Student> implements StudentDao {
	public StudentDaoImpl(Context context) {
		super(new DBHelper(context));
	}
	//sql语句加入left,无论学生有没有班级属性都会查到结果中
	public List<GroupChild> getData() {
		String sql = "select s._id sid,s.name sname,c._id cid,c.name cname from t_student s "
				+ "left join t_classes c on s.classesid=c._id";
		List<Map<String, String>> list = super.query2MapList(sql, null);
		List<GroupChild> retList = new ArrayList<GroupChild>();
		//实现“未分组”功能。
		GroupChild gc1 = new GroupChild();
		gc1.setGroupId("0");
		gc1.setGroupName("未分组");
		retList.add(gc1);

		for (Map<String, String> map : list) {
			GroupChild gc = new GroupChild();
			gc.setChildId(map.get("sid"));
			gc.setChildName(map.get("sname"));
			gc.setGroupId(map.get("cid") == null ? "0" : map.get("cid"));
			gc.setGroupName(map.get("cname") == null ? "未分组" : map
							.get("cname"));
			retList.add(gc);
		}

		return retList;
	}
}

修改MainActivity.java:
(1)修改onCreate方法:

// 设置如果长按在"未分组"上时显示不可编辑并且不显示ContextMenu,优先响应OnItemLongClickListener后才会出来ContextMenu
		expList.setOnItemLongClickListener(itemLongClickListener);

(2)添加OnItemLongClickListener:

OnItemLongClickListener itemLongClickListener = new OnItemLongClickListener() {  
//在LongClickListener判断如果是第一个分组就取消ContextMenu注册.  
       @Override  
        public boolean onItemLongClick(AdapterView<?> parent, View view,  
                int position, long id) {  
            if (position == 0) {  
                toastShow("本组不可编辑和删除!");  
                unregisterForContextMenu(expList);  
            } else {  
                registerForContextMenu(expList);  
            }  
            return false;  
        }  
    };

ExpandableListView实例(一)_数据库增删改查处理和listitem点击长按处理
http://blog.csdn.net/lk_blog/article/details/7562987

ExpandableListView实例(二)_两种方式实现QQ中组后面显示子条目数量效果
http://blog.csdn.net/lk_blog/article/details/7563355

ExpandableListView实例(三)_实现QQ中"未分组"效果和"未分组"不可编辑删除功能
http://blog.csdn.net/lk_blog/article/details/7563371

源代码下载地址: http://download.csdn.net/detail/lk_blog/4299729