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Clarify IdlingResource.ResourceCallback usage. #2482

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copybara-service merged 1 commit into from
May 1, 2026
+8 −1
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Clarify IdlingResource.ResourceCallback usage. #2482

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9 changes: 8 additions & 1 deletion espresso/idling_resource/java/androidx/test/espresso/IdlingResource.java
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Original file line number Diff line number Diff line change
Expand Up @@ -60,7 +60,14 @@ public interface IdlingResource {

/** Registered by an {@link IdlingResource} to notify Espresso of a transition to idle. */
public interface ResourceCallback {
/** Called when the resource goes from busy to idle. */
/**
* Called when the resource goes from busy to idle.
*
* <p>If the idle state is updated on a thread other than the main thread, this method should be
* called <b>before</b> the state is updated to return true. Failing to do so can cause a race
* condition where Espresso throws a consistency error due to observing {@link #isIdleNow()}
* returning true before the callback is invoked.
*/
public void onTransitionToIdle();
}
}
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