Android Developers Docs Reference added in API level 26 java.nio.file.spi Classes FileSystemProvider Service-provider class for file systems. FileTypeDetector A file type detector for probing a file to guess its file type. Classes FileSystemProvider FileTypeDetector Content and code samples on this page are subject to the licenses described in the Content License. Java is a registered trademark of Oracle and/or its affiliates. Last updated May 31, 2018.