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. 
StructDlInfo Corresponds to C's struct Dl_info. 
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 <time.h>. 
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.