Added in API level 21

android.system


Classes

Int64Ref A signed 64bit integer reference suitable for passing to lower-level system calls. 
Os Access to low-level system functionality. 
OsConstants Constants and helper functions for use with Os
StructCmsghdr Corresponds to C's struct cmsghdr
StructMsghdr Corresponds to C's struct msghdr 
StructPollfd Used as an in/out parameter to Os.poll
StructStat File information returned by Os.fstat, Os.lstat, and Os.stat
StructStatVfs File information returned by Os.fstatvfs and Os.statvfs
StructTimespec Corresponds to C's struct timespec from
StructTimeval Corresponds to C's struct timeval from sys/time.h
StructUtsname Information returned by Os.uname
SystemCleaner Java.lang.ref.Cleaner encourages each library to create a Cleaner, with an associated thread, to process Cleaner Runnables for that library's registered cleaning actions. 
VmSocketAddress A virtio-vsock address VmSocketAddress

Exceptions

ErrnoException A checked exception thrown when Os methods fail.