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Added in API level 1

android.os

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

Interfaces

CancellationSignal.OnCancelListener	Listens for cancellation.
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.
MessageQueue.IdleHandler	Callback interface for discovering when a thread is going to block waiting for more messages.
MessageQueue.OnFileDescriptorEventListener	A listener which is invoked when file descriptor related events occur.
Parcelable	Interface for classes whose instances can be written to and restored from a `Parcel`.
Parcelable.ClassLoaderCreator<T>	Specialization of `Parcelable.Creator` that allows you to receive the ClassLoader the object is being created in.
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.
ParcelFileDescriptor.OnCloseListener	Callback indicating that a ParcelFileDescriptor has been closed.
RecoverySystem.ProgressListener	Interface definition for a callback to be invoked regularly as verification proceeds.

Classes

AsyncTask<Params, Progress, Result>	AsyncTask enables proper and easy use of the UI thread.
BaseBundle	A mapping from String keys to values of various types.
BatteryManager	The BatteryManager class contains strings and constants used for values in the `ACTION_BATTERY_CHANGED` Intent, and provides a method for querying battery and charging properties.
Binder	Base class for a remotable object, the core part of a lightweight remote procedure call mechanism defined by `IBinder`.
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 keys to various `Parcelable` values.
CancellationSignal	Provides the ability to cancel an operation in progress.
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.
CpuUsageInfo	CPU usage information per core.
Debug	Provides various debugging methods for Android applications, including tracing and allocation counts.
Debug.InstructionCount	This class was deprecated in API level 23. Instruction counting is no longer supported.
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).
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.
HardwarePropertiesManager	The HardwarePropertiesManager class provides a mechanism of accessing hardware state of a device: CPU, GPU and battery temperatures, CPU usage per core, fan speed, etc.
LocaleList	LocaleList is an immutable list of Locales, typically used to keep an ordered list of user preferences for locales.
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 `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.
PersistableBundle	A mapping from String keys to values of various types.
PowerManager	This class gives you control of the power state of the device.
PowerManager.WakeLock	A wake lock is a mechanism to indicate that your application needs to have the device stay on.
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.)
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.
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 `StrictMode.ThreadPolicy` instances.
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.
TokenWatcher	Helper class that helps you use IBinder objects as reference counted tokens.
Trace	Writes trace events to the system trace buffer.
UserHandle	Representation of a user on the device.
UserManager	Manages users and user details on a multi-user system.
Vibrator	Class that operates the vibrator on the device.
WorkSource	Describes the source of some work that may be done by someone else.

Enums

AsyncTask.Status Indicates the current status of the task.

Exceptions

BadParcelableException	Exception thrown when a `Parcelable` is malformed or otherwise invalid.
DeadObjectException	The object you are calling has died, because its hosting process no longer exists.
DeadSystemException	The core Android system has died and is going through a runtime restart.
FileUriExposedException	The exception that is thrown when an application exposes a `file://` `Uri` to another app.
NetworkOnMainThreadException	The exception that is thrown when an application attempts to perform a networking operation on its main thread.
OperationCanceledException	An exception type that is thrown when an operation in progress is canceled.
ParcelFileDescriptor.FileDescriptorDetachedException	Exception that indicates that the file descriptor was detached.
ParcelFormatException	The contents of a Parcel (usually during unmarshalling) does not contain the expected data.
RemoteException	Parent exception for all Binder remote-invocation errors
TransactionTooLargeException	The Binder transaction failed because it was too large.