getDataDir
Returns the absolute path to the directory on the filesystem where all private files belonging to this app are stored. Apps should not use this path directly; they should instead use getFilesDir, getCacheDir, getDir, or other storage APIs on Context.
The returned path may change over time if the calling app is moved to an adopted storage device, so only relative paths should be persisted.
No additional permissions are required for the calling app to read or write files under the returned path.