mkdirs的SD卡目录返回false而父目录是可写的 [英] mkdirs returns false for directory on sd card while the parent directory is writable
问题描述
在开始我的Android应用程序，我需要创建在SD卡上的目录，对于少数用户失败的，我无法找出理由吧...
When starting my android application, I need to create a directory on the sd card, for a small number of users this fails and I can't figure out the reason for it...
（我发现引起WRITE_EXTERNAL_STORAGE权限缺少类似的问题，它的存在和它的作品，几乎所有的用户，所以我不认为这是原因）
(I've found similar problems caused by the WRITE_EXTERNAL_STORAGE permission missing, it's there and it works for almost all users so I don't think this is reason)
我已经简化了previous情况，使之更容易解释，如果要创建一个directoy失败，我运行一个测试情况下，我尽量让在SD卡一个.TEST目录：
I've simplified the previous situation to make it easier to explain, if creating a directoy fails, I run a test case where I try to make a .test directory on the sdcard:
new File(Environment.getExternalStorageDirectory(), ".test").mkdir() -> false
new File(Environment.getExternalStorageDirectory(), ".test").mkdirs() -> false
相关的目录中的文件属性：
File properties of the relevant directories:
/sdcard/.test（存在=假canWrite =假的CanRead =假canExecute = ERR isDirectory =假ISFILE = FALSE）
/sdcard/.test (exists=false canWrite=false canRead=false canExecute=err isDirectory=false isFile=false)
/ SD卡（存在=真canWrite =真正的CanRead =真canExecute = ERR isDirectory =真ISFILE = FALSE）
/sdcard (exists=true canWrite=true canRead=true canExecute=err isDirectory=true isFile=false)
/（存在=真canWrite =假的CanRead =真canExecute = ERR isDirectory =真ISFILE = FALSE）
/ (exists=true canWrite=false canRead=true canExecute=err isDirectory=true isFile=false)
getExternalStorageState =安装
getExternalStorageState=mounted
（canExecute回报犯错，因为在测试运行SDK＆LT; 9）
(canExecute returns err because the test is run on sdk < 9)
建议和想法都非常欢迎...
Suggestions and ideas are very welcome...
推荐答案
这是常见的，当你没有权限在你的清单。
It is common when you don't have a permission in your manifest.
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
对于我来说，这是唯一的错误的东西。
As for me it was the only wrong thing.
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