android.os

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

Interfaces

CancellationSignal.OnCancelListener	Listens for cancellation.
FileUtils.ProgressListener	Listener that is called periodically as progress is made.
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.
IBinder.FrozenStateChangeCallback	A callback interface for receiving frozen state change events.
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.
OutcomeReceiver<R, E extends Throwable>	Callback interface intended for use when an asynchronous operation may result in a failure.
Parcelable	Interface for classes whose instances can be written to and restored from a `Parcel`.
Parcelable.ClassLoaderCreator<T>	Specialization of `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.
PowerManager.OnThermalHeadroomChangedListener	Listener passed to `PowerManager.addThermalHeadroomListener` and `PowerManager.removeThermalHeadroomListener` to notify caller of Thermal headroom or thresholds changes.
PowerManager.OnThermalStatusChangedListener	Listener passed to `PowerManager.addThermalStatusListener` and `PowerManager.removeThermalStatusListener` to notify caller of thermal status has changed.
PowerManager.WakeLockStateListener	A listener interface to get notified when the wakelock is enabled/disabled.
RecoverySystem.ProgressListener	Interface definition for a callback to be invoked regularly as verification proceeds.
RemoteCallbackList.Builder.InterfaceDiedCallback<E extends IInterface>	For notifying when the process hosting a callback interface has died.
StrictMode.OnThreadViolationListener	When #`StrictMode.ThreadPolicy.Builder.penaltyListener(Executor, OnThreadViolationListener)` is enabled, the listener is called on the provided executor when a Thread violation occurs.
StrictMode.OnVmViolationListener	When #`StrictMode.VmPolicy.Builder.penaltyListener(Executor, OnVmViolationListener)` is enabled, the listener is called on the provided executor when a VM violation occurs.

Classes

AsyncTask<Params, Progress, Result>	This class was deprecated in API level 30. Use the standard `java.util.concurrent` or Kotlin concurrency utilities instead.
BaseBundle	A mapping from String keys to values of various types.
BatteryManager	The BatteryManager class contains strings and constants used for values in the `Intent.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`.
BugreportManager	Class that provides a privileged API to capture and consume bugreports.
BugreportManager.BugreportCallback	An interface describing the callback for bugreport progress and status.
Build	Information about the current build, extracted from system properties.
Build.Partition	Build information for a particular device partition.
Build.VERSION	Various version strings.
Build.VERSION_CODES	Enumeration of the currently known SDK version codes.
Build.VERSION_CODES_FULL	Enumeration of the currently known SDK major and minor version codes.
Bundle	A mapping from String keys to various `Parcelable` values.
CancellationSignal	Provides the ability to cancel an operation in progress.
CombinedVibration	A CombinedVibration describes a combination of haptic effects to be performed by one or more `Vibrators`.
CombinedVibration.ParallelCombination	A combination of haptic effects that should be played in multiple vibrators in parallel.
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.
CpuHeadroomParams	Headroom request params used by `SystemHealthManager.getCpuHeadroom(CpuHeadroomParams)`.
CpuHeadroomParams.Builder
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 any process on the device (including this one).
FileUtils	Utility methods useful for working with files.
GpuHeadroomParams	Headroom request params used by `SystemHealthManager.getGpuHeadroom(GpuHeadroomParams)`.
GpuHeadroomParams.Builder
Handler	A Handler allows you to send and process `Message` and Runnable objects associated with a thread's `MessageQueue`.
HandlerThread	A `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 `SharedMemory` which can optionally be set to purgeable.
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.
PerformanceHintManager	The PerformanceHintManager allows apps to send performance hint to system.
PerformanceHintManager.Session	A Session represents a group of threads with an inter-related workload such that hints for their performance should be considered as a unit.
PersistableBundle	A mapping from String keys to values of various types.
PowerManager	This class lets you query and request control of aspects of the device's power state.
PowerManager.WakeLock	A wake lock is a mechanism to indicate that your application needs to have the device stay on.
PowerMonitor	A PowerMonitor represents either an ODPM rail (on-device power rail monitor) or a modeled energy consumer.
PowerMonitorReadings	A collection of energy measurements from Power Monitors.
Process	Tools for managing OS processes.
ProfilingManager	This class allows the caller to: Request profiling and listen for results.
ProfilingResult	Encapsulates results of a single profiling request operation.
ProfilingTrigger	Encapsulates a single profiling trigger.
ProfilingTrigger.Builder	Builder class to create a `ProfilingTrigger` object.
ProxyFileDescriptorCallback	Callback that handles file system requests from ProxyFileDescriptor.
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.
RemoteCallbackList.Builder<E extends IInterface>	Builder for `RemoteCallbackList`.
ResultReceiver	Generic interface for receiving a callback result from someone.
SecurityStateManager	SecurityStateManager provides the functionality to query the security status of the system and platform components.
SharedMemory	SharedMemory enables the creation, mapping, and protection control over anonymous shared memory.
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.VmPolicy	`StrictMode` policy applied to all threads in the virtual machine's process.
StrictMode.VmPolicy.Builder	Creates `VmPolicy` instances.
SystemClock	Core timekeeping facilities.
TestLooperManager	Blocks a looper from executing any messages, and allows the holder of this object to control when and which messages get executed until it is released.
TokenWatcher	A TokenWatcher watches a collection of `IBinder`s.
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.
VibrationAttributes	Encapsulates a collection of attributes describing information about a vibration.
VibrationAttributes.Builder	Builder class for `VibrationAttributes` objects.
VibrationEffect	A VibrationEffect describes a haptic effect to be performed by a `Vibrator`.
VibrationEffect.BasicEnvelopeBuilder	A builder for waveform effects defined by their envelope, designed to provide a consistent haptic perception across devices with varying capabilities.
VibrationEffect.Composition	A composition of haptic elements that are combined to be playable as a single `VibrationEffect`.
VibrationEffect.WaveformEnvelopeBuilder	A builder for waveform effects described by its envelope.
Vibrator	Class that operates the vibrator on the device.
VibratorManager	Provides access to all vibrators from the device, as well as the ability to run them in a synchronized fashion.
WorkDuration	WorkDuration contains the measured time in nano seconds of the workload in each component, see `PerformanceHintManager.Session.reportActualWorkDuration(WorkDuration)`.
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, or there has been a low-level binder error.
DeadSystemException	The core Android system has died and is going through a runtime restart.
FileUriExposedException	The exception that may be thrown when an application exposes a `file://` `Uri` to another app.
LimitExceededException	Indicates that the app has exceeded a limit set by the System.
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 Note: not all exceptions from binder services will be subclasses of this.
TransactionTooLargeException	The Binder transaction failed because it was too large.
UserManager.UserOperationException	Thrown to indicate user operation failed.