[Feature Request] Change ACTION_GET_CONTENT function to use content provider on older Android versions

[joriswit]

When calling the app using the ACTION_GET_CONTENT intent, I have noticed the app returns a content provider on Android N (API 24) and above. On older versions it simply returns the file url. (see FileOpener.getUriFromFile)

I think it would be nice to lower the version where a content provider is returned. Since the app returns the FLAG_GRANT_READ_URI_PERMISSION flag in the intent, the app which initiated the request expects to be able to read the selected file. But unless the app has READ_EXTERNAL_STORAGE permission, it cannot. If a content provider was used, it could still open the file. I am not sure what the argument is for returning a file url, perhaps content providers are not supported on older versions?

An alternative is to not include the FLAG_GRANT_READ_URI_PERMISSION flag when a file url is returned. The calling app then still can't open the file, but at least it knows.

I have tested this on Android 4.4.