安卓APK里面的lua脚本如何修改

 

作者：hanks

 

做移动端开发，最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。lua 是一种脚本语言，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 /sdcar

d/view.lua
require"import"
import "android.widget.*"
import "android.content.*"
functiongetView()
locallayout = {
LinearLayout,
orientation = "vertical",
layout_width = "fill",
layout_height = "fill",
{
Button,
id = "btn",
layout_marginTop= "8dp",
layout_width = "fill",
layout_height = "50dp",
text = "click"
},
}
localview = loadlayout(layout)
returnview

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.*"
functiongetView()
locallayout = {
LinearLayout,
orientation = "vertical",
layout_width = "fill",
layout_height = "fill",
{
Button,
id = "btn",
layout_marginTop= "8dp",
layout_width = "fill",
layout_height = "50dp",
text = "click"
},
}
localids = {} -- store ids to find view
localview = loadlayout(layout, ids)
ids.btn.onClick = function()
Toast.makeText(activity, "2333", 0).show()
end
returnview
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"
localJSON = require( "cjson")
localuihelper = require( 'uihelper')
-- create view table
locallayout = {
LinearLayout,
orientation = "vertical",
layout_width = "fill",
layout_height = "fill",
{
ListView,
id = "listview",
dividerHeight = 0,
layout_width = "fill",
layout_height = "fill",
},
}
localitem_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",
},
}
localdata = {
dailyList = {}
}
localadapter
localfunctiongetData()
-- http://baobab.kaiyanapp.com/api/v1/feed
localurl = data.nextPageUrl
ifurl == nilthenurl = 'http://baobab.kaiyanapp.com/api/v1/feed?udid=3e7ee30c6fc0004a773dc33b0597b5732b145c04'end
ifurl: find( 'udid=') == nilthenurl = url .. '&udid=3e7ee30c6fc0004a773dc33b0597b5732b145c04'end
print(url)
LuaHttp.request({ url = url }, function(error, code, body)
iferrororcode ~= 200then
print( 'fetch data error')
return
end
localstr = JSON.decode(body)
uihelper.runOnUiThread(activity, function()
data.nextPageUrl = str.nextPageUrl
locallist = str.dailyList[ 1].videoList
fori = 1, #list do
data.dailyList[#data.dailyList + 1] = list[i]
end
adapter.notifyDataSetChanged()
end)
end)
end
localfunctionlaunchDetail(item)
Toast.makeText(activity, item.title, 0).show()
end
functiongetView()
localview = loadlayout(layout)
adapter = LuaAdapter(luajava.createProxy( "androlua.LuaAdapter$AdapterCreator", {
getCount = function()return#data.dailyList end,
getItem = function(position)returnnilend,
getItemId = function(position)returnposition end,
getView = function(position, convertView, parent)
position = position + 1-- lua 索引从 1开始
ifposition == #data.dailyList then
getData()
end
ifconvertView == nilthen
localviews = {} -- store views
convertView = loadlayout(item_view, views, ListView)
ifparent then
localparams = convertView.getLayoutParams()
params.width = parent.getWidth()
end
convertView.setTag(views)
end
localviews = convertView.getTag()
localitem = data.dailyList[position]
ifitem then
LuaImageLoader. load(views.iv_image, item.coverForFeed)
views.tv_title.setText(item.title)
end
returnconvertView
end
}))
listview.setAdapter(adapter)
listview.setOnItemClickListener(luajava.createProxy( "android.widget.AdapterView$OnItemClickListener", {
onItemClick = function(adapter, view, position, id)
launchDetail(data.dailyList[position + 1])
end,
}))
getData()
returnview
end

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

代码放到了github：https://github.com/hanks-zyh/luaDevAndroid

原理图