android.os
Interfaces 
Handler.Callback
IBinder
IBinder.DeathRecipient
IInterface
MessageQueue.IdleHandler
Parcelable
Parcelable.Creator
Classes 
AsyncTask
BatteryManager
Binder
Build
Build.VERSION
Build.VERSION_CODES
Bundle
ConditionVariable
CountDownTimer
Debug
Debug.InstructionCount
Debug.MemoryInfo
Environment
FileObserver
Handler
HandlerThread
Looper
MemoryFile
Message
MessageQueue
Messenger
Parcel
ParcelFileDescriptor
ParcelFileDescriptor.AutoCloseInputStream
ParcelFileDescriptor.AutoCloseOutputStream
ParcelUuid
PatternMatcher
PowerManager
Process
RemoteCallbackList
ResultReceiver
StatFs
SystemClock
TokenWatcher
Vibrator
Enums 
AsyncTask.Status
Exceptions 
BadParcelableException
DeadObjectException
ParcelFormatException
RemoteException