我该如何使用corona sdk从sd卡或手机内存中显示图片?
使用LFS和IO API在Android上可以读写SD卡中的文件。
要访问手机内置存储器,请添加Android权限“android.permission.WRITE_EXTERNAL_STORAGE”,并将路径设置为“/”。从那里,您可以访问内存卡。
示例:
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
这将在终端窗口中打印路径、文件名和文件类型。(仅在Mac和Android设备上测试过。)
我已经找到了一种在Android和模拟器上显示图像的方法。(未在PC上测试)
例如:
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.
我正在使用Corona SDK开发iOS应用,但我相信Corona应用程序是沙盒化的,您无法读取沙盒之外的任何内容。虽然这可能只适用于iOS应用程序。