# MediaRouterTestHelper

# MediaRouterTestHelper

Artifact:[androidx.mediarouter:mediarouter-testing](https://developer.android.com/jetpack/androidx/releases/mediarouter)  
[View Source](https://cs.android.com/search?q=file:androidx/mediarouter/testing/MediaRouterTestHelper.java+class:androidx.mediarouter.testing.MediaRouterTestHelper)  
Added in[1.3.0](https://developer.android.com/jetpack/androidx/releases/mediarouter#1.3.0)

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Kotlin\|[Java](https://developer.android.com/reference/androidx/mediarouter/testing/MediaRouterTestHelper "View this page in Java")

<br />

```
class MediaRouterTestHelper
```

<br />

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A helper class for testing usages of[MediaRouter](https://developer.android.com/reference/kotlin/androidx/mediarouter/media/MediaRouter).

## Summary

|                                    ### Public functions                                     |
|---------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `java-static `[Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | `@`[MainThread](https://developer.android.com/reference/kotlin/androidx/annotation/MainThread) [resetMediaRouter](https://developer.android.com/reference/kotlin/androidx/mediarouter/testing/MediaRouterTestHelper#resetMediaRouter())`()` Resets all internal state of[MediaRouter](https://developer.android.com/reference/kotlin/androidx/mediarouter/media/MediaRouter)for testing. |

## Public functions

### resetMediaRouter

Added in[1.3.0](https://developer.android.com/jetpack/androidx/releases/mediarouter#1.3.0)  

```
@MainThread
java-static fun resetMediaRouter(): Unit
```

Resets all internal state of[MediaRouter](https://developer.android.com/reference/kotlin/androidx/mediarouter/media/MediaRouter)for testing. Should be only used for testing purpose.

After calling this method, the caller should stop using the existing media router instances. Instead, the caller should create a new media router instance again by calling[getInstance](https://developer.android.com/reference/kotlin/androidx/mediarouter/media/MediaRouter#getInstance(android.content.Context)).

Note that the following classes' instances need to be recreated after calling this method, as these classes store the media router instance on their constructor:

- [androidx.mediarouter.app.MediaRouteActionProvider](https://developer.android.com/reference/kotlin/androidx/mediarouter/app/MediaRouteActionProvider)
- [androidx.mediarouter.app.MediaRouteButton](https://developer.android.com/reference/kotlin/androidx/mediarouter/app/MediaRouteButton)
- [androidx.mediarouter.app.MediaRouteChooserDialog](https://developer.android.com/reference/kotlin/androidx/mediarouter/app/MediaRouteChooserDialog)
- [androidx.mediarouter.app.MediaRouteControllerDialog](https://developer.android.com/reference/kotlin/androidx/mediarouter/app/MediaRouteControllerDialog)
- [androidx.mediarouter.app.MediaRouteDiscoveryFragment](https://developer.android.com/reference/kotlin/androidx/mediarouter/app/MediaRouteDiscoveryFragment)
Please make sure this is called in the main thread.