Package android.os

Provides basic operating system services, message passing, and inter-process communication on the device.

See:
Description

Interface Summary

Handler.Callback	Callback interface you can use when instantiating a Handler to avoid having to implement your own subclass of Handler.
IBinder	Base interface for a remotable object, the core part of a lightweight remote procedure call mechanism designed for high performance when performing in-process and cross-process calls.
IBinder.DeathRecipient	Interface for receiving a callback when the process hosting an IBinder has gone away.
IInterface	Base class for Binder interfaces.
IServiceManager	Basic interface for finding and publishing system services.
LocalPowerManager
MessageQueue.IdleHandler	Callback interface for discovering when a thread is going to block waiting for more messages.
Parcelable	Interface for classes whose instances can be written to and restored from a Parcel.
Parcelable.Creator<T>	Interface that must be implemented and provided as a public CREATOR field that generates instances of your Parcelable class from a Parcel.
PerformanceCollector.PerformanceResultsWriter	Interface for reporting performance data.
RecoverySystem.ProgressListener	Interface definition for a callback to be invoked regularly as verification proceeds.

Class Summary

AsyncResult
AsyncTask<Params,Progress,Result>	AsyncTask enables proper and easy use of the UI thread.
BatteryManager	The BatteryManager class contains strings and constants used for values in the Intent.ACTION_BATTERY_CHANGED Intent.
BatteryStats	A class providing access to battery usage statistics, including information on wakelocks, processes, packages, and services.
BatteryStats.BitDescription
BatteryStats.Counter	State for keeping track of counting information.
BatteryStats.HistoryItem
BatteryStats.Timer	State for keeping track of timing information.
BatteryStats.Uid	The statistics associated with a particular uid.
BatteryStats.Uid.Pkg	The statistics associated with a particular package.
BatteryStats.Uid.Proc	The statistics associated with a particular process.
BatteryStats.Uid.Proc.ExcessivePower
BatteryStats.Uid.Sensor
BatteryStats.Uid.Wakelock	The statistics associated with a particular wake lock.
Binder	Base class for a remotable object, the core part of a lightweight remote procedure call mechanism defined by IBinder.
BinderProxy
Broadcaster
Build	Information about the current build, extracted from system properties.
Build.VERSION	Various version strings.
Build.VERSION_CODES	Enumeration of the currently known SDK version codes.
Bundle	A mapping from String values to various Parcelable types.
ConditionVariable	Class that implements the condition variable locking paradigm.
CountDownTimer	Schedule a countdown until a time in the future, with regular notifications on intervals along the way.
Debug	Provides various debugging functions for Android applications, including tracing and allocation counts.
Debug.InstructionCount	API for gathering and querying instruction counts.
Debug.MemoryInfo	This class is used to retrieved various statistics about the memory mappings for this process.
DropBoxManager	Enqueues chunks of data (from various sources -- application crashes, kernel log records, etc.).
DropBoxManager.Entry	A single entry retrieved from the drop box.
Environment	Provides access to environment variables.
FileObserver	Monitors files (using inotify) to fire an event after files are accessed or changed by by any process on the device (including this one).
FileUtils	Tools for managing files.
FileUtils.FileStatus	File status information.
Handler	A Handler allows you to send and process Message and Runnable objects associated with a thread's MessageQueue.
HandlerThread	Handy class for starting a new thread that has a looper.
LatencyTimer	A class to help with measuring latency in your code.
Looper	Class used to run a message loop for a thread.
MemoryFile	MemoryFile is a wrapper for the Linux ashmem driver.
Message	Defines a message containing a description and arbitrary data object that can be sent to a Handler.
MessageQueue	Low-level class holding the list of messages to be dispatched by a Looper.
Messenger	Reference to a Handler, which others can use to send messages to it.
Parcel	Container for a message (data and object references) that can be sent through an IBinder.
ParcelFileDescriptor	The FileDescriptor returned by Parcel.readFileDescriptor(), allowing you to close it when done with it.
ParcelFileDescriptor.AutoCloseInputStream	An InputStream you can create on a ParcelFileDescriptor, which will take care of calling ParcelFileDescriptor.close() for you when the stream is closed.
ParcelFileDescriptor.AutoCloseOutputStream	An OutputStream you can create on a ParcelFileDescriptor, which will take care of calling ParcelFileDescriptor.close() for you when the stream is closed.
ParcelUuid	This class is a Parcelable wrapper around UUID which is an immutable representation of a 128-bit universally unique identifier.
PatternMatcher	A simple pattern matcher, which is safe to use on untrusted data: it does not provide full reg-exp support, only simple globbing that can not be used maliciously.
PerformanceCollector	Collects performance data between two function calls in Bundle objects and outputs the results using writer of type PerformanceCollector.PerformanceResultsWriter.
Power	Class that provides access to some of the power management functions.
PowerManager	This class gives you control of the power state of the device.
Process	Tools for managing OS processes.
RecoverySystem	RecoverySystem contains methods for interacting with the Android recovery system (the separate partition that can be used to install system updates, wipe user data, etc.)
Registrant
RegistrantList
RemoteCallback	TODO: Make this a public API? Let's see how it goes with a few use cases first.
RemoteCallback.RemoteCallbackProxy
RemoteCallbackList<E extends IInterface>	Takes care of the grunt work of maintaining a list of remote interfaces, typically for the use of performing callbacks from a Service to its clients.
ResultReceiver	Generic interface for receiving a callback result from someone.
ServiceManager
ServiceManagerNative	Native implementation of the service manager.
ServiceManagerProxy
StatFs	Retrieve overall information about the space on a filesystem.
StrictMode	StrictMode is a developer tool which detects things you might be doing by accident and brings them to your attention so you can fix them.
StrictMode.ThreadPolicy	StrictMode policy applied to a certain thread.
StrictMode.ThreadPolicy.Builder	Creates ThreadPolicy instances.
StrictMode.ViolationInfo	Parcelable that gets sent in Binder call headers back to callers to report violations that happened during a cross-process call.
StrictMode.VmPolicy	StrictMode policy applied to all threads in the virtual machine's process.
StrictMode.VmPolicy.Builder	Creates StrictMode.VmPolicy instances.
SystemClock	Core timekeeping facilities.
SystemProperties	Gives access to the system properties store.
SystemService
TokenWatcher	Helper class that helps you use IBinder objects as reference counted tokens.
UEventObserver	UEventObserver is an abstract class that receives UEvent's from the kernel.
UEventObserver.UEvent	Representation of a UEvent.
Vibrator	Class that operates the vibrator on the device.
WorkSource	Describes the source of some work that may be done by someone else.

Enum Summary

AsyncTask.Status

Indicates the current status of the task.

Exception Summary

BadParcelableException	The object you are calling has died, because its hosting process no longer exists.
DeadObjectException	The object you are calling has died, because its hosting process no longer exists.
Looper.HandlerException
ParcelFormatException	The contents of a Parcel (usually during unmarshalling) does not contain the expected data.
RemoteException	Parent exception for all Binder remote-invocation errors
RemoteMailException
ZygoteStartFailedEx

Annotation Types Summary

Debug.DebugProperty

Annotation to put on fields you want to set with Debug.setFieldsOn(Class, boolean).

Package android.os Description

Provides basic operating system services, message passing, and inter-process communication on the device.