Android 如何在corona sdk中从SD卡加载图像

如何使用corona sdk显示SD卡或手机内存中的图像？`

我使用corona sdk为iOS开发，但我认为corona应用程序是沙盒，您无法读取沙盒之外的任何内容。我认为这可能只适用于iOS应用程序。

在Android上使用LFS和IO API在SD卡上读写文件是可能的

要访问内置内存中的手机，请添加android权限“android.permission.WRITE_EXTERNAL_STORAGE”，并将路径设置为“/”。从那里你可以访问记忆卡

例如：

local lfs = require("lfs")
local path = "/"
local pathType = ""

-- Check to see if path exists
if path and lfs.attributes( path ) then
    pathType = lfs.attributes( path ).mode
end

-- Check if path is a directory
if pathType == "directory" then
   for file in lfs.dir( path ) do
       if "." ~= file and ".." ~= file then
          -- Get the file attributes.
          local fileAtr = lfs.attributes( path .. "/" .. file )
          -- Print path, name and type of file (Directory or file)
          print(path,file,fileAtr.mode)
       end
    end
end

local lfs = require("lfs")
    --------------------------- Change this path ---------------------------
local path = "path/to/the/image.jpg"                                    -- Change this path to the path of an image on your computer
------------------------------------------------------------------------


local tmpPath = system.pathForFile("tmp.jpg",system.TemporaryDirectory) -- Destination path to the temporary image

--------------------------- Read ----------------------------
local file, reason = io.open( path, "r" )                               -- Open the image in read mode
local contents
if file then
    contents = file:read( "*a" )                                        -- Read contents
    io.close( file )                                                    -- Close the file (Important!)
else
    print("Invalid path")
    return
end

--------------------------- Write ----------------------------

local file = io.open( tmpPath, "w" )                                    -- Open the destination path in write mode
if file then
    file:write(contents)                                                -- Writes the contents to a file
    io.close(file)                                                      -- Close the file (Important!)
else
    print("Error")
    return
end

---------------------- Open and remove -----------------------
local img = display.newImage("tmp.jpg",system.TemporaryDirectory)       -- Display the image from the temporary directory
os.remove(tmpPath)                                                      -- Removes the image, so that we can load another image.

这将在终端窗口中打印文件的路径、文件名和类型。（仅在Mac和Android设备上进行了测试。）

我找到了一种在Android和模拟器上在沙箱外显示图像的方法。（PC未测试）

例如：

local lfs = require("lfs")
local path = "/"
local pathType = ""

-- Check to see if path exists
if path and lfs.attributes( path ) then
    pathType = lfs.attributes( path ).mode
end

-- Check if path is a directory
if pathType == "directory" then
   for file in lfs.dir( path ) do
       if "." ~= file and ".." ~= file then
          -- Get the file attributes.
          local fileAtr = lfs.attributes( path .. "/" .. file )
          -- Print path, name and type of file (Directory or file)
          print(path,file,fileAtr.mode)
       end
    end
end

local lfs = require("lfs")
    --------------------------- Change this path ---------------------------
local path = "path/to/the/image.jpg"                                    -- Change this path to the path of an image on your computer
------------------------------------------------------------------------


local tmpPath = system.pathForFile("tmp.jpg",system.TemporaryDirectory) -- Destination path to the temporary image

--------------------------- Read ----------------------------
local file, reason = io.open( path, "r" )                               -- Open the image in read mode
local contents
if file then
    contents = file:read( "*a" )                                        -- Read contents
    io.close( file )                                                    -- Close the file (Important!)
else
    print("Invalid path")
    return
end

--------------------------- Write ----------------------------

local file = io.open( tmpPath, "w" )                                    -- Open the destination path in write mode
if file then
    file:write(contents)                                                -- Writes the contents to a file
    io.close(file)                                                      -- Close the file (Important!)
else
    print("Error")
    return
end

---------------------- Open and remove -----------------------
local img = display.newImage("tmp.jpg",system.TemporaryDirectory)       -- Display the image from the temporary directory
os.remove(tmpPath)                                                      -- Removes the image, so that we can load another image.

---

我想你是对的。。我在谷歌上搜索了这个问题，但没有得到任何正确的答案，我觉得堆栈溢出的影响更小！我在5天内只看了16次。。。这里很难找到答案。。谢谢你的评论。。我的意思是回答……不用担心。恐怕Ansca为了使Corona在Android和iOS平台上都能工作，不得不放弃对从沙箱外部读取文件的支持。我不认为科罗纳像Cocos2d那样受欢迎，在这里得到如此多的关注。你最好在他们的论坛上提问。