# ActivityLifecycleCallback

Artifact: [androidx.test:monitor](https://developer.android.com/jetpack/androidx/releases/test) [View Source](https://cs.android.com/search?q=file:androidx/test/runner/lifecycle/ActivityLifecycleCallback.java+class:androidx.test.runner.lifecycle.ActivityLifecycleCallback)

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```
public interface ActivityLifecycleCallback
```

<br />

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Callback for monitoring activity lifecycle events. These callbacks are invoked on the main thread, so any long operations or violating the strict mode policies should be avoided.

## Summary

| ### Public methods |
|---|---|
| `abstract void` | `https://developer.android.com/reference/androidx/test/runner/lifecycle/ActivityLifecycleCallback#onActivityLifecycleChanged(android.app.Activity,androidx.test.runner.lifecycle.Stage)(https://developer.android.com/reference/android/app/Activity.html activity, https://developer.android.com/reference/androidx/test/runner/lifecycle/Stage stage)` Called on the main thread after an activity has processed its lifecycle change event (for example onResume or onStart) |

## Public methods

### onActivityLifecycleChanged

```
abstract void onActivityLifecycleChanged(Activity activity, Stage stage)
```

Called on the main thread after an activity has processed its lifecycle change event (for example onResume or onStart)

| Parameters |
|---|---|
| `https://developer.android.com/reference/android/app/Activity.html activity` | The activity |
| `https://developer.android.com/reference/androidx/test/runner/lifecycle/Stage stage` | its current stage. |