Use this class in tests to confirm that back-press fallbacks and callback status changes are invoked as expected. It tracks the number of times these events occur via public counters.
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Last updated 2025-08-27 UTC.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-27 UTC."],[],[],null,["# TestNavigationEventDispatcherOwner\n==================================\n\nArtifact: [androidx.navigationevent:navigationevent-testing](/jetpack/androidx/releases/navigationevent) \n[View Source](https://cs.android.com/search?q=file:androidx/navigationevent/testing/TestNavigationDispatcherOwner.kt+class:androidx.navigationevent.testing.TestNavigationEventDispatcherOwner) \nAdded in [1.0.0-alpha06](/jetpack/androidx/releases/navigationevent#1.0.0-alpha06)\n\n*** ** * ** ***\n\nKotlin \\|[Java](/reference/androidx/navigationevent/testing/TestNavigationEventDispatcherOwner \"View this page in Java\")\nCommon/All\n - Cmn \n\n ```\n class TestNavigationEventDispatcherOwner : NavigationEventDispatcherOwner\n ```\n\n*** ** * ** ***\n\nA test implementation of [NavigationEventDispatcherOwner](/reference/kotlin/androidx/navigationevent/NavigationEventDispatcherOwner) for verifying [NavigationEventDispatcher](/reference/kotlin/androidx/navigationevent/NavigationEventDispatcher) interactions.\n\nUse this class in tests to confirm that back-press fallbacks and callback status changes are invoked as expected. It tracks the number of times these events occur via public counters.\n\nSummary\n-------\n\n| ### Public constructors |\n|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----|\n| [TestNavigationEventDispatcherOwner](/reference/kotlin/androidx/navigationevent/testing/TestNavigationEventDispatcherOwner#TestNavigationEventDispatcherOwner(kotlin.Function1,kotlin.Function1))`(` ` fallbackOnBackPressed: `[TestNavigationEventDispatcherOwner](/reference/kotlin/androidx/navigationevent/testing/TestNavigationEventDispatcherOwner)`.() `-\u003e` `[Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html)`,` ` onHasEnabledCallbacksChanged: `[TestNavigationEventDispatcherOwner](/reference/kotlin/androidx/navigationevent/testing/TestNavigationEventDispatcherOwner)`.() `-\u003e` `[Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) `)` | Cmn |\n\n| ### Public properties |\n|----------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----|\n| [Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) | [fallbackOnBackPressedInvocations](/reference/kotlin/androidx/navigationevent/testing/TestNavigationEventDispatcherOwner#fallbackOnBackPressedInvocations()) The number of times [NavigationEventDispatcher.fallbackOnBackPressed](/reference/kotlin/androidx/navigationevent/NavigationEventDispatcher#fallbackOnBackPressed()) has been invoked. | Cmn |\n| `open `[NavigationEventDispatcher](/reference/kotlin/androidx/navigationevent/NavigationEventDispatcher) | [navigationEventDispatcher](/reference/kotlin/androidx/navigationevent/testing/TestNavigationEventDispatcherOwner#navigationEventDispatcher()) The [NavigationEventDispatcher](/reference/kotlin/androidx/navigationevent/NavigationEventDispatcher) that should handle the navigation events. | Cmn |\n| [Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) | [onHasEnabledCallbacksChangedInvocations](/reference/kotlin/androidx/navigationevent/testing/TestNavigationEventDispatcherOwner#onHasEnabledCallbacksChangedInvocations()) The number of times [NavigationEventDispatcher.onHasEnabledCallbacksChanged](/reference/kotlin/androidx/navigationevent/NavigationEventDispatcher#onHasEnabledCallbacksChanged()) has been invoked. | Cmn |\n\nPublic constructors\n-------------------\n\n### TestNavigationEventDispatcherOwner\n\nCmn \nAdded in [1.0.0-alpha06](/jetpack/androidx/releases/navigationevent#1.0.0-alpha06) \n\n```\nTestNavigationEventDispatcherOwner(\n fallbackOnBackPressed: TestNavigationEventDispatcherOwner.() -\u003e Unit = {},\n onHasEnabledCallbacksChanged: TestNavigationEventDispatcherOwner.() -\u003e Unit = {}\n)\n``` \n\n| Parameters |\n|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| `fallbackOnBackPressed: `[TestNavigationEventDispatcherOwner](/reference/kotlin/androidx/navigationevent/testing/TestNavigationEventDispatcherOwner)`.() `-\u003e` `[Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html)` = {}` | A lambda invoked by the [NavigationEventDispatcher](/reference/kotlin/androidx/navigationevent/NavigationEventDispatcher) when a back press occurs and no other callbacks handle it. |\n| `onHasEnabledCallbacksChanged: `[TestNavigationEventDispatcherOwner](/reference/kotlin/androidx/navigationevent/testing/TestNavigationEventDispatcherOwner)`.() `-\u003e` `[Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html)` = {}` | A lambda invoked by the [NavigationEventDispatcher](/reference/kotlin/androidx/navigationevent/NavigationEventDispatcher) when its [NavigationEventDispatcher.hasEnabledCallbacks](/reference/kotlin/androidx/navigationevent/NavigationEventDispatcher#hasEnabledCallbacks()) status changes. |\n\nPublic properties\n-----------------\n\n### fallbackOnBackPressedInvocations\n\nCmn \nAdded in [1.0.0-alpha06](/jetpack/androidx/releases/navigationevent#1.0.0-alpha06) \n\n```\nval fallbackOnBackPressedInvocations: Int\n```\n\nThe number of times [NavigationEventDispatcher.fallbackOnBackPressed](/reference/kotlin/androidx/navigationevent/NavigationEventDispatcher#fallbackOnBackPressed()) has been invoked. \n\n### navigationEventDispatcher\n\nCmn \nAdded in [1.0.0-alpha06](/jetpack/androidx/releases/navigationevent#1.0.0-alpha06) \n\n```\nopen val navigationEventDispatcher: NavigationEventDispatcher\n```\n\nThe [NavigationEventDispatcher](/reference/kotlin/androidx/navigationevent/NavigationEventDispatcher) that should handle the navigation events. \n\n### onHasEnabledCallbacksChangedInvocations\n\nCmn \nAdded in [1.0.0-alpha06](/jetpack/androidx/releases/navigationevent#1.0.0-alpha06) \n\n```\nval onHasEnabledCallbacksChangedInvocations: Int\n```\n\nThe number of times [NavigationEventDispatcher.onHasEnabledCallbacksChanged](/reference/kotlin/androidx/navigationevent/NavigationEventDispatcher#onHasEnabledCallbacksChanged()) has been invoked."]]
