UiThreadTestRule

Kotlin |Java

public class UiThreadTestRule implements TestRule

This rule allows the test method annotated with UiThreadTest to execute on the application's main thread (or UI thread).

Note, methods annotated with Before and After will also be executed on the UI thread.

See also
`UiThreadTest`	if you need to switch in and out of the UI thread within your method.

Summary

Public constructors
`UiThreadTestRule()`

Public methods
`Statement`	`apply(Statement base, Description description)`
`void`	`runOnUiThread(Runnable runnable)` Helper method for running part of a method on the UI thread.

Protected methods
`boolean`	`shouldRunOnUiThread(Description description)`

Public constructors

UiThreadTestRule

public UiThreadTestRule()

Public methods

apply

public Statement apply(Statement base, Description description)

runOnUiThread

public void runOnUiThread(Runnable runnable)

Helper method for running part of a method on the UI thread.

Note: In most cases it is simpler to annotate the test method with UiThreadTest.

Use this method if you need to switch in and out of the UI thread within your method.

Parameters
`Runnable runnable`	runnable containing test code in the `run` method

Throws
`java.lang.Throwable`

See also
`UiThreadTest`

Protected methods

shouldRunOnUiThread

protected boolean shouldRunOnUiThread(Description description)

Content and code samples on this page are subject to the licenses described in the Content License. Java and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.

Last updated 2025-05-15 UTC.

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