Discover hanks-zyh/luaDevAndroid Open Source project

做移动端开发，做蛋疼的就是不能动态发版，不能像 web 那样发版立即全部用户生效，然而 lua语言为其提供了可能性。使用 lua 来构建跨平台原生应用有许多好处，比如 lua 语言简洁高效，可移植性好， Lua虚拟机极为轻量，仅占用200到300k的内存空间，且速度极快。

演示

写一个简单的代码演示一下。新建一个 lua 文件，叫做 view.lua, 放在手机的 sdcard 上，文件目录为 /sdcard/view.lua

require "import"
import "android.widget.*"
import "android.content.*"

function getView()
    local layout = {
        LinearLayout,
        orientation = "vertical",
        layout_width = "fill",
        layout_height = "fill",
        {
            Button,
            id = "btn",
            layout_marginTop="8dp",
            layout_width = "fill",
            layout_height = "50dp",
            text = "click"
        },
    }
    local view = loadlayout(layout)
    return view
end

运行一下，

屏幕中上半部分是 Android 的 xml 布局中写好的代码，当点击运行按钮时，加载 lua 脚本，返回一个 View 对象，然后添加到布局中。一个简单的 lua 脚本编写的视图就写好了。接下来修改一下，设置个点击事件。

require "import"
import "android.widget.*"
import "android.content.*"

function getView()
    local layout = {
        LinearLayout,
        orientation = "vertical",
        layout_width = "fill",
        layout_height = "fill",
        {
            Button,
            id = "btn",
            layout_marginTop="8dp",
            layout_width = "fill",
            layout_height = "50dp",
            text = "click"
        },
    }
    local ids = {} -- store ids to find view
    local view = loadlayout(layout, ids)
    ids.btn.onClick = function()
        Toast.makeText(activity,"2333",0).show()
    end
    return view
end

运行效果

再来个稍微复杂点的例子，写个列表，新建 list.lua 文件，放在手机的 sdcard/list.lua

require "import"
import "android.widget.*"
import "android.content.*"
import "android.view.View"
import "androlua.LuaHttp"
import "androlua.LuaAdapter"
import "androlua.LuaImageLoader"

local JSON = require("cjson")
local uihelper = require('uihelper')

-- create view table
local layout = {
    LinearLayout,
    orientation = "vertical",
    layout_width = "fill",
    layout_height = "fill",
    {
        ListView,
        id = "listview",
        dividerHeight = 0,
        layout_width = "fill",
        layout_height = "fill",
    },
}

local item_view = {
    FrameLayout,
    layout_width = "fill",
    layout_height = "240dp",
    {
        ImageView,
        id = "iv_image",
        layout_width = "fill",
        layout_height = "fill",
        scaleType = "centerCrop",
    },
    {
        TextView,
        id = "tv_title",
        background = "#66000000",
        layout_width = "fill",
        layout_height = "fill",
        padding = "32dp",
        gravity = "center",
        maxLines = "5",
        lineSpacingMultiplier = '1.2',
        textSize = "14sp",
        textColor = "#CCFFFFFF",
    },
}


local data = {
    dailyList = {}
}
local adapter

local function getData()
    -- http://baobab.kaiyanapp.com/api/v1/feed
    local url = data.nextPageUrl
    if url == nil then url = 'http://baobab.kaiyanapp.com/api/v1/feed?udid=3e7ee30c6fc0004a773dc33b0597b5732b145c04' end
    if url:find('udid=') == nil then url = url .. '&udid=3e7ee30c6fc0004a773dc33b0597b5732b145c04' end
    print(url)
    LuaHttp.request({ url = url }, function(error, code, body)
        if error or code ~= 200 then
            print('fetch data error')
            return
        end
        local str = JSON.decode(body)
        uihelper.runOnUiThread(activity, function()
            data.nextPageUrl = str.nextPageUrl
            local list = str.dailyList[1].videoList
            for i = 1, #list do
                data.dailyList[#data.dailyList + 1] = list[i]
            end
            adapter.notifyDataSetChanged()
        end)
    end)
end

local function launchDetail(item)
    Toast.makeText(activity, item.title, 0).show()
end

function getView()
    local view = loadlayout(layout)
    adapter = LuaAdapter(luajava.createProxy("androlua.LuaAdapter$AdapterCreator", {
        getCount = function() return #data.dailyList end,
        getItem = function(position) return nil end,
        getItemId = function(position) return position end,
        getView = function(position, convertView, parent)
            position = position + 1 -- lua 索引从 1开始
            if position == #data.dailyList then
                getData()
            end
            if convertView == nil then
                local views = {} -- store views
                convertView = loadlayout(item_view, views, ListView)
                if parent then
                    local params = convertView.getLayoutParams()
                    params.width = parent.getWidth()
                end
                convertView.setTag(views)
            end
            local views = convertView.getTag()
            local item = data.dailyList[position]
            if item then
                LuaImageLoader.load(views.iv_image, item.coverForFeed)
                views.tv_title.setText(item.title)
            end
            return convertView
        end
    }))
    listview.setAdapter(adapter)
    listview.setOnItemClickListener(luajava.createProxy("android.widget.AdapterView$OnItemClickListener", {
        onItemClick = function(adapter, view, position, id)
            launchDetail(data.dailyList[position + 1])
        end,
    }))
    getData()
    return view
end

创建 listView ，设置 adapter ，网络请求，刷新列表。看下效果吧。

代码放到了 github 👉 源码

github:hanks-zyh
weibo: @D蓝小鱼
twitter: hanks
email: [email protected]

hanks-zyh/luaDevAndroid

hanks-zyh

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演示

原理图

支持 iOS 吗？

Android 开发能支持到什么程度？

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