All applications can read and write files placed on the external storage and the user can remove them.On Android 7.0 or later, if you need access to a specific directory on external storage, use scoped directory access.For example, here's a method that creates a directory for a new photo album in the public pictures directory: If you are handling files that are not intended for other apps to use (such as graphic textures or sound effects used by only your app), you should use a private storage directory on the external storage by calling Note: When the user uninstalls your application, this directory and all its contents are deleted.Also, the system media scanner does not read files in these directories, so they are not accessible from the content provider.Android provides several options for you to save persistent application data.The solution you choose depends on your specific needs, such as whether the data should be private to your application or accessible to other applications (and the user) and how much space your data requires.When doing so, you should use to one of the shared public directories, such as , or others.By saving your files to the corresponding media-type directory, the system's media scanner can properly categorize your files in the system (for instance, ringtones appear in system settings as ringtones, not as music).
Before you do any work with the external storage, you should always call to check whether the media is available.
Scoped directory access simplifies how your application accesses standard external storage directories, such as the directory, and provides a simple permissions UI that clearly details what directory the application is requesting access to.
For more details on scoped directory access, see Using Scoped Directory Access.
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