安卓代码注释 能不能尽可能告诉详细一些！

Question

 //获取当前用户所有历史订单数据    public ArrayList<Order> getOrdersbyTableIndex(String username){     //map表key是订单编号     ArrayList<Order> orders = new ArrayList<Order>();     HashMap<String, ArrayList<Dish>> ordersmap = new HashMap<String, ArrayList<Dish>>();        ArrayList<Dish> dishes = new ArrayList<Dish>();        if(TextUtils.isEmpty(username)){         return orders;        }        SQLiteDatabase db = this.getWritableDatabase();        Cursor cur = db.rawQuery("SELECT * FROM "+TABLE_ORDER, null);        if (cur != null) {            if (cur.moveToFirst()) {                do {                    int numColumn = cur.getColumnIndex(DISH_USERNAME);                    String o_tableindex  = cur.getString(numColumn);                    if(username.equals(o_tableindex)){                        int COLID = cur.getColumnIndex(ORDER_ID);                        String d_id = cur.getString(COLID);                                                if(ordersmap.containsKey(d_id)){                         dishes = ordersmap.get(d_id);                        }else{                         dishes = new ArrayList<Dish>();                         ordersmap.put(d_id, dishes);                        }                                                int NUMPASS = cur.getColumnIndex(DISH_NAME);                        String d_name = cur.getString(NUMPASS);                        int COLPRICE = cur.getColumnIndex(DISH_PRICE);                        int d_price = Integer.parseInt(cur.getString(COLPRICE).toString());                        int COLPIC = cur.getColumnIndex(DISH_PIC);                        int d_pic = Integer.parseInt(cur.getString(COLPIC).toString());                        int COLNUM = cur.getColumnIndex(DISH_NUM);                        int d_num = Integer.parseInt(cur.getString(COLNUM).toString());                        int COLSHOP = cur.getColumnIndex(DISH_SHOP);                        String c_shop = cur.getString(COLSHOP);                        Dish dish = new Dish(d_name,d_price,d_pic,d_num, c_shop);                        dishes.add(dish);                    }                }while( cur.moveToNext());            }        }        db.close();        for(String key: ordersmap.keySet()){         Order order = new Order(key, ordersmap.get(key));         orders.add(order);        }        System.out.print("获取订单数量：" + orders.size());        return orders;    }

Answer 1

0 0我来拿分来了！

    public ArrayList<Order> getOrdersbyTableIndex(String username){
	    	//map表key是订单编号
	    	ArrayList<Order> orders = new ArrayList<Order>();
	    	HashMap<String, ArrayList<Dish>> ordersmap = new HashMap<String, ArrayList<Dish>>();
	        ArrayList<Dish> dishes = new ArrayList<Dish>();
	        if(TextUtils.isEmpty(username)){
	        	return orders;
	        }
	        SQLiteDatabase db = this.getWritableDatabase();
	        Cursor cur = db.rawQuery("SELECT * FROM "+TABLE_ORDER, null);
	        if (cur != null) {	//防止Cursor为null
	            if (cur.moveToFirst()) {	//cur是一个指针，此处是说将指针移动到第一个位置。同时，cur.moveToFirst()的返回值是一个boolean，为ture证明有数据
	                do {
	                    int numColumn = cur.getColumnIndex(DISH_USERNAME);//根据DISH_USERNAME拿到对应列的index
	                    String o_tableindex  = cur.getString(numColumn);//根据上面返回的numColumn即index，拿到对应的值
	                    if(username.equals(o_tableindex)){//如果username和o_tableindex相等
	                        int COLID = cur.getColumnIndex(ORDER_ID);
	                        String d_id = cur.getString(COLID);
	                        
	                        if(ordersmap.containsKey(d_id)){//如果ordersmap这个集合包含了d_id这个key
	                        	dishes = ordersmap.get(d_id);//根据key拿到对应的value，此处value是一个ArrayList<Dish>集合
	                        }else{
								//如果d_id不存在，就向ordersmap里面存
	                        	dishes = new ArrayList<Dish>();
	                        	ordersmap.put(d_id, dishes);
	                        }
	                        //下面代码方法和上面一样，我只写不同的
	                        int NUMPASS = cur.getColumnIndex(DISH_NAME);
	                        String d_name = cur.getString(NUMPASS);

	                        int COLPRICE = cur.getColumnIndex(DISH_PRICE);
	                        int d_price = Integer.parseInt(cur.getString(COLPRICE).toString());//把String转换为int(可能你数据库存的String类型的吧= =)


	                        int COLPIC = cur.getColumnIndex(DISH_PIC);
	                        int d_pic = Integer.parseInt(cur.getString(COLPIC).toString());


	                        int COLNUM = cur.getColumnIndex(DISH_NUM);
	                        int d_num = Integer.parseInt(cur.getString(COLNUM).toString());

	                        int COLSHOP = cur.getColumnIndex(DISH_SHOP);
	                        String c_shop = cur.getString(COLSHOP);

	                        Dish dish = new Dish(d_name,d_price,d_pic,d_num, c_shop);
	                        dishes.add(dish);
	                    }
	                }while( cur.moveToNext());
	            }
	        }
	        db.close();//关闭数据库，数据库用完必须关闭
	        for(String key: ordersmap.keySet()){	//增强for循环，即foreach。此处遍历map，ketSet()是拿到对应map的key
	        	Order order = new Order(key, ordersmap.get(key));//key和value
	        	orders.add(order);
	        }
	        System.out.print("获取订单数量：" + orders.size());
	        return orders;
	    }	

Answer 2

哈哈 给你给你 谢谢大神！项目过了！