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IAN LAKE: A computer file is a resource for storing information. Almost all the files youre used to working with are openable files-- files with a direct representation in bytes. But theres actually another kind of file-- a virtual file, a new part of the Storage Access Framework added in API 24. Now, on Android, a traditional file is known as an openable file. This comes from the fact that you can open a file stream and get directly at the bytes that make up the file via something like openFileDescriptor or openInputStream. And in most cases when youre using something like getContent or ActionOpenDocument, this is exactly what youd want. So way back in API 1, Android added CATEGORYOPENABLE. Youd add this to your intent, and then you could ensure that what you got back could be opened. Virtual files will appear, but they wont be selectable. If youre already using that category, never get a virtual file, and you dont need to worry about them. But if you dont include CATEGORY
