Added in API level 1

Runnable

@FunctionalInterface interface Runnable
AnimationDrawable

An object used to create frame-by-frame animations, defined by a series of Drawable objects, which can be used as a View object's background.

CookieSyncManager

The CookieSyncManager is used to synchronize the browser cookie store between RAM and permanent storage.

RenderScript.RSErrorHandler

The runtime error handler base class.

RenderScript.RSMessageHandler

The base class from which an application should derive in order to receive RS messages from scripts.

RunnableFuture

A Future that is Runnable.

Thread

A thread is a thread of execution in a program.

TimerTask

A task that can be scheduled for one-time or repeated execution by a Timer.

ForkJoinWorkerThread

A thread managed by a ForkJoinPool, which executes ForkJoinTasks.

FutureTask

A cancellable asynchronous computation.

HandlerThread

A Thread that has a Looper.

RunnableScheduledFuture

A ScheduledFuture that is Runnable.

The Runnable interface should be implemented by any class whose instances are intended to be executed by a thread. The class must define a method of no arguments called run.

This interface is designed to provide a common protocol for objects that wish to execute code while they are active. For example, Runnable is implemented by class Thread. Being active simply means that a thread has been started and has not yet been stopped.

In addition, Runnable provides the means for a class to be active while not subclassing Thread. A class that implements Runnable can run without subclassing Thread by instantiating a Thread instance and passing itself in as the target. In most cases, the Runnable interface should be used if you are only planning to override the run() method and no other Thread methods. This is important because classes should not be subclassed unless the programmer intends on modifying or enhancing the fundamental behavior of the class.

Summary

Public methods
abstract Unit
run()

When an object implementing interface Runnable is used to create a thread, starting the thread causes the object's run method to be called in that separately executing thread.

Public methods

run

Added in API level 1
abstract fun run(): Unit

When an object implementing interface Runnable is used to create a thread, starting the thread causes the object's run method to be called in that separately executing thread.

The general contract of the method run is that it may take any action whatsoever.