Returns the absolute path to the directory on the primary external filesystem (that is somewhere on Android.OS.Environment.ExternalStorageDirectory where the application can place cache files it owns. These files are internal to the application, and not typically visible to the user as media.

This is like Context.CacheDir in that these files will be deleted when the application is uninstalled, however there are some important differences:

• The platform does not always monitor the space available in external storage, and thus may not automatically delete these files. Currently the only time files here will be deleted by the platform is when running on NoType:android/os/Build$VERSION_CODES;Href=../../../reference/android/os/Build.VERSION_CODES.html#JELLY_BEAN_MR1 or later and Android.OS.Environment.IsExternalStorageEmulated returns true. Note that you should be managing the maximum space you will use for these anyway, just like with Context.CacheDir.
• External files are not always available: they will disappear if the user mounts the external storage on a computer or removes it. See the APIs on Android.OS.Environment for information in the storage state.
• There is no security enforced with these files. For example, any application holding NoType:android/Manifest$permission;Href=../../../reference/android/Manifest.permission.html#WRITE_EXTERNAL_STORAGE can write to these files.

Starting in NoType:android/os/Build$VERSION_CODES;Href=../../../reference/android/os/Build.VERSION_CODES.html#KITKAT, no permissions are required to read or write to the returned path; it's always accessible to the calling app. This only applies to paths generated for package name of the calling application. To access paths belonging to other packages, NoType:android/Manifest$permission;Href=../../../reference/android/Manifest.permission.html#WRITE_EXTERNAL_STORAGE and/or NoType:android/Manifest$permission;Href=../../../reference/android/Manifest.permission.html#READ_EXTERNAL_STORAGE are required.

On devices with multiple users (as described by Android.OS.UserManager), each user has their own isolated external storage. Applications only have access to the external storage for the user they're running as.

[Android Documentation]