Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels) # android.os *** ** * ** *** Provides basic operating system services, message passing, and inter-process communication on the device. ## Interfaces |---|---| | [CancellationSignal.OnCancelListener](https://developer.android.com/reference/android/os/CancellationSignal.OnCancelListener) | Listens for cancellation. | | [FileUtils.ProgressListener](https://developer.android.com/reference/android/os/FileUtils.ProgressListener) | Listener that is called periodically as progress is made. | | [Handler.Callback](https://developer.android.com/reference/android/os/Handler.Callback) | Callback interface you can use when instantiating a Handler to avoid having to implement your own subclass of Handler. | | [IBinder](https://developer.android.com/reference/android/os/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](https://developer.android.com/reference/android/os/IBinder.DeathRecipient) | Interface for receiving a callback when the process hosting an IBinder has gone away. | | [IBinder.FrozenStateChangeCallback](https://developer.android.com/reference/android/os/IBinder.FrozenStateChangeCallback) | A callback interface for receiving frozen state change events. | | [IInterface](https://developer.android.com/reference/android/os/IInterface) | Base class for Binder interfaces. | | [MessageQueue.IdleHandler](https://developer.android.com/reference/android/os/MessageQueue.IdleHandler) | Callback interface for discovering when a thread is going to block waiting for more messages. | | [MessageQueue.OnFileDescriptorEventListener](https://developer.android.com/reference/android/os/MessageQueue.OnFileDescriptorEventListener) | A listener which is invoked when file descriptor related events occur. | | [OutcomeReceiver](https://developer.android.com/reference/android/os/OutcomeReceiver)\ | Callback interface intended for use when an asynchronous operation may result in a failure. | | [Parcelable](https://developer.android.com/reference/android/os/Parcelable) | Interface for classes whose instances can be written to and restored from a `https://developer.android.com/reference/android/os/Parcel`. | | [Parcelable.ClassLoaderCreator](https://developer.android.com/reference/android/os/Parcelable.ClassLoaderCreator)\ | Specialization of `https://developer.android.com/reference/android/os/Parcelable.Creator` that allows you to receive the ClassLoader the object is being created in. | | [Parcelable.Creator](https://developer.android.com/reference/android/os/Parcelable.Creator)\ | Interface that must be implemented and provided as a public CREATOR field that generates instances of your Parcelable class from a Parcel. | | [ParcelFileDescriptor.OnCloseListener](https://developer.android.com/reference/android/os/ParcelFileDescriptor.OnCloseListener) | Callback indicating that a ParcelFileDescriptor has been closed. | | [PowerManager.OnThermalHeadroomChangedListener](https://developer.android.com/reference/android/os/PowerManager.OnThermalHeadroomChangedListener) | Listener passed to `https://developer.android.com/reference/android/os/PowerManager#addThermalHeadroomListener(android.os.PowerManager.OnThermalHeadroomChangedListener)` and `https://developer.android.com/reference/android/os/PowerManager#removeThermalHeadroomListener(android.os.PowerManager.OnThermalHeadroomChangedListener)` to notify caller of Thermal headroom or thresholds changes. | | [PowerManager.OnThermalStatusChangedListener](https://developer.android.com/reference/android/os/PowerManager.OnThermalStatusChangedListener) | Listener passed to `https://developer.android.com/reference/android/os/PowerManager#addThermalStatusListener(android.os.PowerManager.OnThermalStatusChangedListener)` and `https://developer.android.com/reference/android/os/PowerManager#removeThermalStatusListener(android.os.PowerManager.OnThermalStatusChangedListener)` to notify caller of thermal status has changed. | | [PowerManager.WakeLockStateListener](https://developer.android.com/reference/android/os/PowerManager.WakeLockStateListener) | A listener interface to get notified when the wakelock is enabled/disabled. | | [RecoverySystem.ProgressListener](https://developer.android.com/reference/android/os/RecoverySystem.ProgressListener) | Interface definition for a callback to be invoked regularly as verification proceeds. | | [RemoteCallbackList.Builder.InterfaceDiedCallback](https://developer.android.com/reference/android/os/RemoteCallbackList.Builder.InterfaceDiedCallback)\ | For notifying when the process hosting a callback interface has died. | | [StrictMode.OnThreadViolationListener](https://developer.android.com/reference/android/os/StrictMode.OnThreadViolationListener) | When #`https://developer.android.com/reference/android/os/StrictMode.ThreadPolicy.Builder#penaltyListener(java.util.concurrent.Executor,%20android.os.StrictMode.OnThreadViolationListener)` is enabled, the listener is called on the provided executor when a Thread violation occurs. | | [StrictMode.OnVmViolationListener](https://developer.android.com/reference/android/os/StrictMode.OnVmViolationListener) | When #`https://developer.android.com/reference/android/os/StrictMode.VmPolicy.Builder#penaltyListener(java.util.concurrent.Executor,%20android.os.StrictMode.OnVmViolationListener)` is enabled, the listener is called on the provided executor when a VM violation occurs. | ## Classes |---|---| | [AsyncTask](https://developer.android.com/reference/android/os/AsyncTask)\ | *This class was deprecated in API level 30. Use the standard `java.util.concurrent` or [Kotlin concurrency utilities](https://developer.android.com/topic/libraries/architecture/coroutines) instead.* | | [BaseBundle](https://developer.android.com/reference/android/os/BaseBundle) | A mapping from String keys to values of various types. | | [BatteryManager](https://developer.android.com/reference/android/os/BatteryManager) | The BatteryManager class contains strings and constants used for values in the `https://developer.android.com/reference/android/content/Intent#ACTION_BATTERY_CHANGED` Intent, and provides a method for querying battery and charging properties. | | [Binder](https://developer.android.com/reference/android/os/Binder) | Base class for a remotable object, the core part of a lightweight remote procedure call mechanism defined by `https://developer.android.com/reference/android/os/IBinder`. | | [BugreportManager](https://developer.android.com/reference/android/os/BugreportManager) | Class that provides a privileged API to capture and consume bugreports. | | [BugreportManager.BugreportCallback](https://developer.android.com/reference/android/os/BugreportManager.BugreportCallback) | An interface describing the callback for bugreport progress and status. | | [Build](https://developer.android.com/reference/android/os/Build) | Information about the current build, extracted from system properties. | | [Build.Partition](https://developer.android.com/reference/android/os/Build.Partition) | Build information for a particular device partition. | | [Build.VERSION](https://developer.android.com/reference/android/os/Build.VERSION) | Various version strings. | | [Build.VERSION_CODES](https://developer.android.com/reference/android/os/Build.VERSION_CODES) | Enumeration of the currently known SDK version codes. | | [Build.VERSION_CODES_FULL](https://developer.android.com/reference/android/os/Build.VERSION_CODES_FULL) | Enumeration of the currently known SDK major and minor version codes. | | [Bundle](https://developer.android.com/reference/android/os/Bundle) | A mapping from String keys to various `https://developer.android.com/reference/android/os/Parcelable` values. | | [CancellationSignal](https://developer.android.com/reference/android/os/CancellationSignal) | Provides the ability to cancel an operation in progress. | | [CombinedVibration](https://developer.android.com/reference/android/os/CombinedVibration) | A CombinedVibration describes a combination of haptic effects to be performed by one or more `https://developer.android.com/reference/android/os/Vibrator`. | | [CombinedVibration.ParallelCombination](https://developer.android.com/reference/android/os/CombinedVibration.ParallelCombination) | A combination of haptic effects that should be played in multiple vibrators in parallel. | | [ConditionVariable](https://developer.android.com/reference/android/os/ConditionVariable) | Class that implements the condition variable locking paradigm. | | [CountDownTimer](https://developer.android.com/reference/android/os/CountDownTimer) | Schedule a countdown until a time in the future, with regular notifications on intervals along the way. | | [CpuHeadroomParams](https://developer.android.com/reference/android/os/CpuHeadroomParams) | Headroom request params used by `https://developer.android.com/reference/android/os/health/SystemHealthManager#getCpuHeadroom(android.os.CpuHeadroomParams)`. | | [CpuHeadroomParams.Builder](https://developer.android.com/reference/android/os/CpuHeadroomParams.Builder) | | | [CpuUsageInfo](https://developer.android.com/reference/android/os/CpuUsageInfo) | CPU usage information per core. | | [Debug](https://developer.android.com/reference/android/os/Debug) | Provides various debugging methods for Android applications, including tracing and allocation counts. | | [Debug.InstructionCount](https://developer.android.com/reference/android/os/Debug.InstructionCount) | *This class was deprecated in API level 23. Instruction counting is no longer supported.* | | [Debug.MemoryInfo](https://developer.android.com/reference/android/os/Debug.MemoryInfo) | This class is used to retrieved various statistics about the memory mappings for this process. | | [DropBoxManager](https://developer.android.com/reference/android/os/DropBoxManager) | Enqueues chunks of data (from various sources -- application crashes, kernel log records, etc.). | | [DropBoxManager.Entry](https://developer.android.com/reference/android/os/DropBoxManager.Entry) | A single entry retrieved from the drop box. | | [Environment](https://developer.android.com/reference/android/os/Environment) | Provides access to environment variables. | | [FileObserver](https://developer.android.com/reference/android/os/FileObserver) | Monitors files (using [inotify](http://en.wikipedia.org/wiki/Inotify)) to fire an event after files are accessed or changed by any process on the device (including this one). | | [FileUtils](https://developer.android.com/reference/android/os/FileUtils) | Utility methods useful for working with files. | | [GpuHeadroomParams](https://developer.android.com/reference/android/os/GpuHeadroomParams) | Headroom request params used by `https://developer.android.com/reference/android/os/health/SystemHealthManager#getGpuHeadroom(android.os.GpuHeadroomParams)`. | | [GpuHeadroomParams.Builder](https://developer.android.com/reference/android/os/GpuHeadroomParams.Builder) | | | [Handler](https://developer.android.com/reference/android/os/Handler) | A Handler allows you to send and process `https://developer.android.com/reference/android/os/Message` and Runnable objects associated with a thread's `https://developer.android.com/reference/android/os/MessageQueue`. | | [HandlerThread](https://developer.android.com/reference/android/os/HandlerThread) | A `https://developer.android.com/reference/java/lang/Thread` that has a `https://developer.android.com/reference/android/os/Looper`. | | [HardwarePropertiesManager](https://developer.android.com/reference/android/os/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](https://developer.android.com/reference/android/os/LocaleList) | LocaleList is an immutable list of Locales, typically used to keep an ordered list of user preferences for locales. | | [Looper](https://developer.android.com/reference/android/os/Looper) | Class used to run a message loop for a thread. | | [MemoryFile](https://developer.android.com/reference/android/os/MemoryFile) | MemoryFile is a wrapper for `https://developer.android.com/reference/android/os/SharedMemory` which can optionally be set to purgeable. | | [Message](https://developer.android.com/reference/android/os/Message) | Defines a message containing a description and arbitrary data object that can be sent to a `https://developer.android.com/reference/android/os/Handler`. | | [MessageQueue](https://developer.android.com/reference/android/os/MessageQueue) | Low-level class holding the list of messages to be dispatched by a `https://developer.android.com/reference/android/os/Looper`. | | [Messenger](https://developer.android.com/reference/android/os/Messenger) | Reference to a Handler, which others can use to send messages to it. | | [Parcel](https://developer.android.com/reference/android/os/Parcel) | Container for a message (data and object references) that can be sent through an IBinder. | | [ParcelFileDescriptor](https://developer.android.com/reference/android/os/ParcelFileDescriptor) | The FileDescriptor returned by `https://developer.android.com/reference/android/os/Parcel#readFileDescriptor()`, allowing you to close it when done with it. | | [ParcelFileDescriptor.AutoCloseInputStream](https://developer.android.com/reference/android/os/ParcelFileDescriptor.AutoCloseInputStream) | An InputStream you can create on a ParcelFileDescriptor, which will take care of calling `https://developer.android.com/reference/android/os/ParcelFileDescriptor#close()` for you when the stream is closed. | | [ParcelFileDescriptor.AutoCloseOutputStream](https://developer.android.com/reference/android/os/ParcelFileDescriptor.AutoCloseOutputStream) | An OutputStream you can create on a ParcelFileDescriptor, which will take care of calling `https://developer.android.com/reference/android/os/ParcelFileDescriptor#close()` for you when the stream is closed. | | [ParcelUuid](https://developer.android.com/reference/android/os/ParcelUuid) | This class is a Parcelable wrapper around `https://developer.android.com/reference/java/util/UUID` which is an immutable representation of a 128-bit universally unique identifier. | | [PatternMatcher](https://developer.android.com/reference/android/os/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](https://developer.android.com/reference/android/os/PerformanceHintManager) | The PerformanceHintManager allows apps to send performance hint to system. | | [PerformanceHintManager.Session](https://developer.android.com/reference/android/os/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](https://developer.android.com/reference/android/os/PersistableBundle) | A mapping from String keys to values of various types. | | [PowerManager](https://developer.android.com/reference/android/os/PowerManager) | This class lets you query and request control of aspects of the device's power state. | | [PowerManager.WakeLock](https://developer.android.com/reference/android/os/PowerManager.WakeLock) | A wake lock is a mechanism to indicate that your application needs to have the device stay on. | | [PowerMonitor](https://developer.android.com/reference/android/os/PowerMonitor) | A PowerMonitor represents either an ODPM rail (on-device power rail monitor) or a modeled energy consumer. | | [PowerMonitorReadings](https://developer.android.com/reference/android/os/PowerMonitorReadings) | A collection of energy measurements from Power Monitors. | | [Process](https://developer.android.com/reference/android/os/Process) | Tools for managing OS processes. | | [ProfilingManager](https://developer.android.com/reference/android/os/ProfilingManager) | This class allows the caller to: - Request profiling and listen for results. | | [ProfilingResult](https://developer.android.com/reference/android/os/ProfilingResult) | Encapsulates results of a single profiling request operation. | | [ProfilingTrigger](https://developer.android.com/reference/android/os/ProfilingTrigger) | Encapsulates a single profiling trigger. | | [ProfilingTrigger.Builder](https://developer.android.com/reference/android/os/ProfilingTrigger.Builder) | Builder class to create a `https://developer.android.com/reference/android/os/ProfilingTrigger` object. | | [ProxyFileDescriptorCallback](https://developer.android.com/reference/android/os/ProxyFileDescriptorCallback) | Callback that handles file system requests from ProxyFileDescriptor. | | [RecoverySystem](https://developer.android.com/reference/android/os/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](https://developer.android.com/reference/android/os/RemoteCallbackList)\ | Takes care of the grunt work of maintaining a list of remote interfaces, typically for the use of performing callbacks from a `https://developer.android.com/reference/android/app/Service` to its clients. | | [RemoteCallbackList.Builder](https://developer.android.com/reference/android/os/RemoteCallbackList.Builder)\ | Builder for `https://developer.android.com/reference/android/os/RemoteCallbackList`. | | [ResultReceiver](https://developer.android.com/reference/android/os/ResultReceiver) | Generic interface for receiving a callback result from someone. | | [SecurityStateManager](https://developer.android.com/reference/android/os/SecurityStateManager) | SecurityStateManager provides the functionality to query the security status of the system and platform components. | | [SharedMemory](https://developer.android.com/reference/android/os/SharedMemory) | SharedMemory enables the creation, mapping, and protection control over anonymous shared memory. | | [StatFs](https://developer.android.com/reference/android/os/StatFs) | Retrieve overall information about the space on a filesystem. | | [StrictMode](https://developer.android.com/reference/android/os/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](https://developer.android.com/reference/android/os/StrictMode.ThreadPolicy) | `https://developer.android.com/reference/android/os/StrictMode` policy applied to a certain thread. | | [StrictMode.ThreadPolicy.Builder](https://developer.android.com/reference/android/os/StrictMode.ThreadPolicy.Builder) | Creates `https://developer.android.com/reference/android/os/StrictMode.ThreadPolicy` instances. | | [StrictMode.VmPolicy](https://developer.android.com/reference/android/os/StrictMode.VmPolicy) | `https://developer.android.com/reference/android/os/StrictMode` policy applied to all threads in the virtual machine's process. | | [StrictMode.VmPolicy.Builder](https://developer.android.com/reference/android/os/StrictMode.VmPolicy.Builder) | Creates `https://developer.android.com/reference/android/os/StrictMode.VmPolicy` instances. | | [SystemClock](https://developer.android.com/reference/android/os/SystemClock) | Core timekeeping facilities. | | [TestLooperManager](https://developer.android.com/reference/android/os/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](https://developer.android.com/reference/android/os/TokenWatcher) | A TokenWatcher watches a collection of `https://developer.android.com/reference/android/os/IBinder`s. | | [Trace](https://developer.android.com/reference/android/os/Trace) | Writes trace events to the system trace buffer. | | [UserHandle](https://developer.android.com/reference/android/os/UserHandle) | Representation of a user on the device. | | [UserManager](https://developer.android.com/reference/android/os/UserManager) | Manages users and user details on a multi-user system. | | [VibrationAttributes](https://developer.android.com/reference/android/os/VibrationAttributes) | Encapsulates a collection of attributes describing information about a vibration. | | [VibrationAttributes.Builder](https://developer.android.com/reference/android/os/VibrationAttributes.Builder) | Builder class for `https://developer.android.com/reference/android/os/VibrationAttributes` objects. | | [VibrationEffect](https://developer.android.com/reference/android/os/VibrationEffect) | A VibrationEffect describes a haptic effect to be performed by a `https://developer.android.com/reference/android/os/Vibrator`. | | [VibrationEffect.BasicEnvelopeBuilder](https://developer.android.com/reference/android/os/VibrationEffect.BasicEnvelopeBuilder) | A builder for waveform effects defined by their envelope, designed to provide a consistent haptic perception across devices with varying capabilities. | | [VibrationEffect.Builder](https://developer.android.com/reference/android/os/VibrationEffect.Builder) | A builder for composing haptic effects by sequencing various haptic elements. | | [VibrationEffect.Composition](https://developer.android.com/reference/android/os/VibrationEffect.Composition) | A composition of haptic elements that are combined to be playable as a single `https://developer.android.com/reference/android/os/VibrationEffect`. | | [VibrationEffect.Envelope](https://developer.android.com/reference/android/os/VibrationEffect.Envelope) | Represents a haptic effect defined by an envelope, to be used within a `https://developer.android.com/reference/android/os/VibrationEffect.Builder`. | | [VibrationEffect.Event](https://developer.android.com/reference/android/os/VibrationEffect.Event) | Represents a single event in a vibration composition with a start time relative to the start of the composition. | | [VibrationEffect.Preset](https://developer.android.com/reference/android/os/VibrationEffect.Preset) | Represents a predefined haptics pattern, corresponding to `https://developer.android.com/`. | | [VibrationEffect.WaveformEnvelopeBuilder](https://developer.android.com/reference/android/os/VibrationEffect.WaveformEnvelopeBuilder) | A builder for waveform effects described by its envelope. | | [Vibrator](https://developer.android.com/reference/android/os/Vibrator) | Class that operates the vibrator on the device. | | [VibratorManager](https://developer.android.com/reference/android/os/VibratorManager) | Provides access to all vibrators from the device, as well as the ability to run them in a synchronized fashion. | | [WorkDuration](https://developer.android.com/reference/android/os/WorkDuration) | WorkDuration contains the measured time in nano seconds of the workload in each component, see `https://developer.android.com/reference/android/os/PerformanceHintManager.Session#reportActualWorkDuration(android.os.WorkDuration)`. | | [WorkSource](https://developer.android.com/reference/android/os/WorkSource) | Describes the source of some work that may be done by someone else. | ## Enums |---|---| | [AsyncTask.Status](https://developer.android.com/reference/android/os/AsyncTask.Status) | Indicates the current status of the task. | ## Exceptions |---|---| | [BadParcelableException](https://developer.android.com/reference/android/os/BadParcelableException) | Exception thrown when a `https://developer.android.com/reference/android/os/Parcelable` is malformed or otherwise invalid. | | [DeadObjectException](https://developer.android.com/reference/android/os/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](https://developer.android.com/reference/android/os/DeadSystemException) | The core Android system has died and is going through a runtime restart. | | [FileUriExposedException](https://developer.android.com/reference/android/os/FileUriExposedException) | The exception that may be thrown when an application exposes a `file://` `https://developer.android.com/reference/android/net/Uri` to another app. | | [LimitExceededException](https://developer.android.com/reference/android/os/LimitExceededException) | Indicates that the app has exceeded a limit set by the System. | | [NetworkOnMainThreadException](https://developer.android.com/reference/android/os/NetworkOnMainThreadException) | The exception that is thrown when an application attempts to perform a networking operation on its main thread. | | [OperationCanceledException](https://developer.android.com/reference/android/os/OperationCanceledException) | An exception type that is thrown when an operation in progress is canceled. | | [ParcelFileDescriptor.FileDescriptorDetachedException](https://developer.android.com/reference/android/os/ParcelFileDescriptor.FileDescriptorDetachedException) | Exception that indicates that the file descriptor was detached. | | [ParcelFormatException](https://developer.android.com/reference/android/os/ParcelFormatException) | The contents of a Parcel (usually during unmarshalling) does not contain the expected data. | | [RemoteException](https://developer.android.com/reference/android/os/RemoteException) | Parent exception for all Binder remote-invocation errors Note: not all exceptions from binder services will be subclasses of this. | | [TransactionTooLargeException](https://developer.android.com/reference/android/os/TransactionTooLargeException) | The Binder transaction failed because it was too large. | | [UserManager.UserOperationException](https://developer.android.com/reference/android/os/UserManager.UserOperationException) | Thrown to indicate user operation failed. | | [VibrationEffect.VibrationParseException](https://developer.android.com/reference/android/os/VibrationEffect.VibrationParseException) | Exception thrown when parsing a vibration XML fails due to invalid format or values. | - ## Interfaces - [CancellationSignal.OnCancelListener](https://developer.android.com/reference/android/os/CancellationSignal.OnCancelListener) - [FileUtils.ProgressListener](https://developer.android.com/reference/android/os/FileUtils.ProgressListener) - [Handler.Callback](https://developer.android.com/reference/android/os/Handler.Callback) - [IBinder](https://developer.android.com/reference/android/os/IBinder) - [IBinder.DeathRecipient](https://developer.android.com/reference/android/os/IBinder.DeathRecipient) - [IBinder.FrozenStateChangeCallback](https://developer.android.com/reference/android/os/IBinder.FrozenStateChangeCallback) - [IInterface](https://developer.android.com/reference/android/os/IInterface) - [MessageQueue.IdleHandler](https://developer.android.com/reference/android/os/MessageQueue.IdleHandler) - [MessageQueue.OnFileDescriptorEventListener](https://developer.android.com/reference/android/os/MessageQueue.OnFileDescriptorEventListener) - [OutcomeReceiver](https://developer.android.com/reference/android/os/OutcomeReceiver) - [Parcelable](https://developer.android.com/reference/android/os/Parcelable) - [Parcelable.ClassLoaderCreator](https://developer.android.com/reference/android/os/Parcelable.ClassLoaderCreator) - [Parcelable.Creator](https://developer.android.com/reference/android/os/Parcelable.Creator) - [ParcelFileDescriptor.OnCloseListener](https://developer.android.com/reference/android/os/ParcelFileDescriptor.OnCloseListener) - [PowerManager.OnThermalHeadroomChangedListener](https://developer.android.com/reference/android/os/PowerManager.OnThermalHeadroomChangedListener) - [PowerManager.OnThermalStatusChangedListener](https://developer.android.com/reference/android/os/PowerManager.OnThermalStatusChangedListener) - [PowerManager.WakeLockStateListener](https://developer.android.com/reference/android/os/PowerManager.WakeLockStateListener) - [RecoverySystem.ProgressListener](https://developer.android.com/reference/android/os/RecoverySystem.ProgressListener) - [RemoteCallbackList.Builder.InterfaceDiedCallback](https://developer.android.com/reference/android/os/RemoteCallbackList.Builder.InterfaceDiedCallback) - [StrictMode.OnThreadViolationListener](https://developer.android.com/reference/android/os/StrictMode.OnThreadViolationListener) - [StrictMode.OnVmViolationListener](https://developer.android.com/reference/android/os/StrictMode.OnVmViolationListener) - ## Classes - [AsyncTask](https://developer.android.com/reference/android/os/AsyncTask) - [BaseBundle](https://developer.android.com/reference/android/os/BaseBundle) - [BatteryManager](https://developer.android.com/reference/android/os/BatteryManager) - [Binder](https://developer.android.com/reference/android/os/Binder) - [BugreportManager](https://developer.android.com/reference/android/os/BugreportManager) - [BugreportManager.BugreportCallback](https://developer.android.com/reference/android/os/BugreportManager.BugreportCallback) - [Build](https://developer.android.com/reference/android/os/Build) - [Build.Partition](https://developer.android.com/reference/android/os/Build.Partition) - [Build.VERSION](https://developer.android.com/reference/android/os/Build.VERSION) - [Build.VERSION_CODES](https://developer.android.com/reference/android/os/Build.VERSION_CODES) - [Build.VERSION_CODES_FULL](https://developer.android.com/reference/android/os/Build.VERSION_CODES_FULL) - [Bundle](https://developer.android.com/reference/android/os/Bundle) - [CancellationSignal](https://developer.android.com/reference/android/os/CancellationSignal) - [CombinedVibration](https://developer.android.com/reference/android/os/CombinedVibration) - [CombinedVibration.ParallelCombination](https://developer.android.com/reference/android/os/CombinedVibration.ParallelCombination) - [ConditionVariable](https://developer.android.com/reference/android/os/ConditionVariable) - [CountDownTimer](https://developer.android.com/reference/android/os/CountDownTimer) - [CpuHeadroomParams](https://developer.android.com/reference/android/os/CpuHeadroomParams) - [CpuHeadroomParams.Builder](https://developer.android.com/reference/android/os/CpuHeadroomParams.Builder) - [CpuUsageInfo](https://developer.android.com/reference/android/os/CpuUsageInfo) - [Debug](https://developer.android.com/reference/android/os/Debug) - [Debug.InstructionCount](https://developer.android.com/reference/android/os/Debug.InstructionCount) - [Debug.MemoryInfo](https://developer.android.com/reference/android/os/Debug.MemoryInfo) - [DropBoxManager](https://developer.android.com/reference/android/os/DropBoxManager) - [DropBoxManager.Entry](https://developer.android.com/reference/android/os/DropBoxManager.Entry) - [Environment](https://developer.android.com/reference/android/os/Environment) - [FileObserver](https://developer.android.com/reference/android/os/FileObserver) - [FileUtils](https://developer.android.com/reference/android/os/FileUtils) - [GpuHeadroomParams](https://developer.android.com/reference/android/os/GpuHeadroomParams) - [GpuHeadroomParams.Builder](https://developer.android.com/reference/android/os/GpuHeadroomParams.Builder) - [Handler](https://developer.android.com/reference/android/os/Handler) - [HandlerThread](https://developer.android.com/reference/android/os/HandlerThread) - [HardwarePropertiesManager](https://developer.android.com/reference/android/os/HardwarePropertiesManager) - [LocaleList](https://developer.android.com/reference/android/os/LocaleList) - [Looper](https://developer.android.com/reference/android/os/Looper) - [MemoryFile](https://developer.android.com/reference/android/os/MemoryFile) - [Message](https://developer.android.com/reference/android/os/Message) - [MessageQueue](https://developer.android.com/reference/android/os/MessageQueue) - [Messenger](https://developer.android.com/reference/android/os/Messenger) - [Parcel](https://developer.android.com/reference/android/os/Parcel) - [ParcelFileDescriptor](https://developer.android.com/reference/android/os/ParcelFileDescriptor) - [ParcelFileDescriptor.AutoCloseInputStream](https://developer.android.com/reference/android/os/ParcelFileDescriptor.AutoCloseInputStream) - [ParcelFileDescriptor.AutoCloseOutputStream](https://developer.android.com/reference/android/os/ParcelFileDescriptor.AutoCloseOutputStream) - [ParcelUuid](https://developer.android.com/reference/android/os/ParcelUuid) - [PatternMatcher](https://developer.android.com/reference/android/os/PatternMatcher) - [PerformanceHintManager](https://developer.android.com/reference/android/os/PerformanceHintManager) - [PerformanceHintManager.Session](https://developer.android.com/reference/android/os/PerformanceHintManager.Session) - [PersistableBundle](https://developer.android.com/reference/android/os/PersistableBundle) - [PowerManager](https://developer.android.com/reference/android/os/PowerManager) - [PowerManager.WakeLock](https://developer.android.com/reference/android/os/PowerManager.WakeLock) - [PowerMonitor](https://developer.android.com/reference/android/os/PowerMonitor) - [PowerMonitorReadings](https://developer.android.com/reference/android/os/PowerMonitorReadings) - [Process](https://developer.android.com/reference/android/os/Process) - [ProfilingManager](https://developer.android.com/reference/android/os/ProfilingManager) - [ProfilingResult](https://developer.android.com/reference/android/os/ProfilingResult) - [ProfilingTrigger](https://developer.android.com/reference/android/os/ProfilingTrigger) - [ProfilingTrigger.Builder](https://developer.android.com/reference/android/os/ProfilingTrigger.Builder) - [ProxyFileDescriptorCallback](https://developer.android.com/reference/android/os/ProxyFileDescriptorCallback) - [RecoverySystem](https://developer.android.com/reference/android/os/RecoverySystem) - [RemoteCallbackList](https://developer.android.com/reference/android/os/RemoteCallbackList) - [RemoteCallbackList.Builder](https://developer.android.com/reference/android/os/RemoteCallbackList.Builder) - [ResultReceiver](https://developer.android.com/reference/android/os/ResultReceiver) - [SecurityStateManager](https://developer.android.com/reference/android/os/SecurityStateManager) - [SharedMemory](https://developer.android.com/reference/android/os/SharedMemory) - [StatFs](https://developer.android.com/reference/android/os/StatFs) - [StrictMode](https://developer.android.com/reference/android/os/StrictMode) - [StrictMode.ThreadPolicy](https://developer.android.com/reference/android/os/StrictMode.ThreadPolicy) - [StrictMode.ThreadPolicy.Builder](https://developer.android.com/reference/android/os/StrictMode.ThreadPolicy.Builder) - [StrictMode.VmPolicy](https://developer.android.com/reference/android/os/StrictMode.VmPolicy) - [StrictMode.VmPolicy.Builder](https://developer.android.com/reference/android/os/StrictMode.VmPolicy.Builder) - [SystemClock](https://developer.android.com/reference/android/os/SystemClock) - [TestLooperManager](https://developer.android.com/reference/android/os/TestLooperManager) - [TokenWatcher](https://developer.android.com/reference/android/os/TokenWatcher) - [Trace](https://developer.android.com/reference/android/os/Trace) - [UserHandle](https://developer.android.com/reference/android/os/UserHandle) - [UserManager](https://developer.android.com/reference/android/os/UserManager) - [VibrationAttributes](https://developer.android.com/reference/android/os/VibrationAttributes) - [VibrationAttributes.Builder](https://developer.android.com/reference/android/os/VibrationAttributes.Builder) - [VibrationEffect](https://developer.android.com/reference/android/os/VibrationEffect) - [VibrationEffect.BasicEnvelopeBuilder](https://developer.android.com/reference/android/os/VibrationEffect.BasicEnvelopeBuilder) - [VibrationEffect.Builder](https://developer.android.com/reference/android/os/VibrationEffect.Builder) - [VibrationEffect.Composition](https://developer.android.com/reference/android/os/VibrationEffect.Composition) - [VibrationEffect.Envelope](https://developer.android.com/reference/android/os/VibrationEffect.Envelope) - [VibrationEffect.Event](https://developer.android.com/reference/android/os/VibrationEffect.Event) - [VibrationEffect.Preset](https://developer.android.com/reference/android/os/VibrationEffect.Preset) - [VibrationEffect.WaveformEnvelopeBuilder](https://developer.android.com/reference/android/os/VibrationEffect.WaveformEnvelopeBuilder) - [Vibrator](https://developer.android.com/reference/android/os/Vibrator) - [VibratorManager](https://developer.android.com/reference/android/os/VibratorManager) - [WorkDuration](https://developer.android.com/reference/android/os/WorkDuration) - [WorkSource](https://developer.android.com/reference/android/os/WorkSource) - ## Enums - [AsyncTask.Status](https://developer.android.com/reference/android/os/AsyncTask.Status) - ## Exceptions - [BadParcelableException](https://developer.android.com/reference/android/os/BadParcelableException) - [DeadObjectException](https://developer.android.com/reference/android/os/DeadObjectException) - [DeadSystemException](https://developer.android.com/reference/android/os/DeadSystemException) - [FileUriExposedException](https://developer.android.com/reference/android/os/FileUriExposedException) - [LimitExceededException](https://developer.android.com/reference/android/os/LimitExceededException) - [NetworkOnMainThreadException](https://developer.android.com/reference/android/os/NetworkOnMainThreadException) - [OperationCanceledException](https://developer.android.com/reference/android/os/OperationCanceledException) - [ParcelFileDescriptor.FileDescriptorDetachedException](https://developer.android.com/reference/android/os/ParcelFileDescriptor.FileDescriptorDetachedException) - [ParcelFormatException](https://developer.android.com/reference/android/os/ParcelFormatException) - [RemoteException](https://developer.android.com/reference/android/os/RemoteException) - [TransactionTooLargeException](https://developer.android.com/reference/android/os/TransactionTooLargeException) - [UserManager.UserOperationException](https://developer.android.com/reference/android/os/UserManager.UserOperationException) - [VibrationEffect.VibrationParseException](https://developer.android.com/reference/android/os/VibrationEffect.VibrationParseException)