| ActiveRootLister | Provides access to all root views in an application. |
| IdlingUiController | Similar to UiController but with one additional method that enables getting an instance
of IdlingResourceRegistry. |
| InterruptableUiController | Similar to UiController but with one additional method that enables interrupting Espresso
tasks. |
| DefaultFailureHandler | Espresso's default FailureHandler. |
| IdlingResourceRegistry | Keeps track of user-registered IdlingResources. |
| RootViewPicker | Provides the root View of the top-most Window, with which the user can interact. |
| ViewFinderImpl | Implementation of ViewFinder. |