How to set permission for Folder in Blackberry ?

I want to know how to set permission for folder that is created by my app so no one can delete or see that fold开发者_StackOverflow中文版er.

I think this is not 100% possible, however you may do smth in this direction. Check for FileConnection.setHidden(boolean), FileConnection.setWritable(boolean) and FileConnection.setReadable(boolean).

First of all, the API docs are vague as to whether those methods will have any effect at all on a specific device (meaning a file system).

Secondly, even if you use FileConnection.setHidden(boolean), then it is still possible for another app to "see" your file/dir by using FileConnection.list(String filter, boolean includeHidden). Once one has a path of you hidden dir, he/she can change the hidden attr (and other attrs), so it becomes visible/readable/killable.