这个电视菜单绘制方案这里讲一下demo的实现方案
①首先模拟菜单数据。在真实编程中，这里应该是存放在本地数据库或者其他位置的真实菜单数据，由于是demo，所以这里是模拟数据
②然后通过fastJson将json数据（就是上一步模拟的json字符串）转换成对象的列表，这里的对象指的是需要展示在电视上的『展示项目』，比如说图片、线、『鱼香肉丝』等
③遍历对象列表，通过调用MenuManager中的paint方法，根据传入绘制工厂的item的类型，调用不同的绘制方法实现绘图。
以上就是demo的实现方案。
如果要想商业化使用，需要实现以下几个点：
①菜单的切换，这一块主要是展示时菜单的清空和重绘
②菜单的读取，需要能够快速并且无误的完成读写操作
③菜单信息的自动刷新，后台运行service定时从服务器获取售罄菜品列表，和本地菜品列表进行对比，找到应该标为售罄和取消售罄的列表并实现绘制
1、MenuActivity 处理菜单的类
String demoData = "{
" +
" "menu_type": 0,
" +
" "date": "",
" +
" "day": "",
" +
" "time_bucket_name": "午餐",
" +
" "time_bucket_id": "31",
" +
" "list": [
" +
" {
" +
" "item_type": 0,
" +
" "item_id": 1,
" +
" "content": "干货",
" +
" "x": 10,
" +
" "y": 80.5,
" +
" "font_size": 30,
" +
" "font_type": 0,
" +
" "color": "#ffffff"
" +
" },
" +
" {
" +
" "item_type": 1,
" +
" "item_id": 2,
" +
" "content": "肉夹馍",
" +
" "x": 100,
" +
" "y": 80.5,
" +
" "font_size": 30,
" +
" "font_type": 1,
" +
" "color": "#000000",
" +
" "chargeitem_id": 341,
" +
" "price": 12.5,
" +
" "show_price": 0,
" +
" "indent": 350,
" +
" "dynamic_price": 0,
" +
" "dynamic_content": 1
" +
" },
" +
" {
" +
" "item_type": 1,
" +
" "item_id": 3,
" +
" "content": "好吃的肉夹馍",
" +
" "x": 400,
" +
" "y": 180,
" +
" "font_size": 30,
" +
" "font_type": 0,
" +
" "color": "#000000",
" +
" "chargeitem_id": 341,
" +
" "price": 12,
" +
" "show_price": 1,
" +
" "indent": 400,
" +
" "dynamic_price": 1,
" +
" "dynamic_content": 1
" +
" },
" +
" {
" +
" "item_type": 2,
" +
" "item_id": 4,
" +
" "x": 0,
" +
" "y": 400,
" +
" "width": 2048
" +
" },
" +
" {
" +
" "item_type": 3,
" +
" "item_id": 5,
" +
" "x": 500,
" +
" "y": 20,
" +
" "height": 1000
" +
" },
" +
" {
" +
" "item_type": 4,
" +
" "item_id": 6,
" +
" "x": 100,
" +
" "y": 200,
" +
" "width": 300,
" +
" "height": 300,
" +
" "src": "http://7rflgy.com1.z0.glb.clouddn.com/image-14.jpg"
" +
" },
" +
" {
" +
" "item_type": 5,
" +
" "item_id": 7,
" +
" "src": "http://7rflgy.com1.z0.glb.clouddn.com/blackboard.jpeg",
" +
" "laying_mode": 0
" +
" }
" +
" ]
" +
"}";//假设这里是从服务器获取到的某天某个营业时间段的菜单数据
int length = demoData.getBytes().length*4;
JSONObject objDemo = JSON.parseObject(demoData);
com.alibaba.fastjson.JSONArray arrayDemo = objDemo.getJSONArray("list");
List<DisplayMenuItem> list = com.alibaba.fastjson.JSONArray.parseArray(arrayDemo.toJSONString(), DisplayMenuItem.class);//通过fastJson解析数组中的每个元素，得到的是某个菜单的所有『展示项目』的一个集合
MenuManager.getInstance().showMenu(list);
2、 MenuManager
/**
* 显示菜单，并更新本地的绑定id列表
*
* @param displayMenuItemList
*/
public void showMenu(List<DisplayMenuItem> displayMenuItemList) {
mapServerWidgetMatchId.clear();
for (DisplayMenuItem item : displayMenuItemList) {
PaintFactory.getPaint(item).paint(rlMain, ivMain);//绘制工厂类根据item的类型在rlMain上进行绘制
if (item.item_type == MenuActivity.ItemTypeMenu) {
if (item.chargeitem_id != -1 && item.chargeitem_id != 0) {
mapServerWidgetMatchId.put(item.chargeitem_id, item.item_id);//如果是被关联到服务器上的，记录在Map中，用来动态售罄信息
}
}
}
CommonUtils.LogWuwei("","size is "+mapServerWidgetMatchId.keySet().size());
}
3、绘制工厂类PaintFactory
/**
* author: Created by zzl on 16/1/8.
*/
public class PaintFactory {
public static Context ctxt;
public static int fenbianlv[]= new int[2];
public static double x_fraction;
public static double y_fraction;
public static Typeface fontFaceChalkBoard;
public static void init()
{
ctxt = MainApplication.getContext();
fenbianlv = CommonUtils.getScreenWidthAndHeight(MainApplication.getmActivity());
x_fraction = fenbianlv[0] / 1920.0;
y_fraction = fenbianlv[1] / 1080.0;
fontFaceChalkBoard = Typeface.createFromAsset(MainApplication.getmActivity().getAssets(), "fonts/pianpina.ttf");
}
public static BasePaint getPaint(DisplayMenuItem item)
{
switch (item.item_type)//根据item的类型调用不同的方法完成绘制
{
case MenuActivity.ItemTypeText:
return new PaintText(item);
case MenuActivity.ItemTypeMenu:
return new PaintMenuItem(item);
case MenuActivity.ItemTypeHorizontalLine:
return new PaintHorizontalLine(item);
case MenuActivity.ItemTypeVerticalLine:
return new PaintVerticalLine(item);
case MenuActivity.ItemTypePicture:
return new PaintPic(item);
case MenuActivity.ItemTypeBackgroundPic:
return new PaintBackgroundPic(item);
}
return null;
}
}