# TriggerBuilders.Trigger

# TriggerBuilders.Trigger

Artifact:[androidx.wear.protolayout:protolayout](https://developer.android.com/jetpack/androidx/releases/wear-protolayout)  
[View Source](https://cs.android.com/search?q=file:androidx/wear/protolayout/TriggerBuilders.java+class:androidx.wear.protolayout.TriggerBuilders.Trigger)  
Added in[1.0.0](https://developer.android.com/jetpack/androidx/releases/wear-protolayout#1.0.0)

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Kotlin\|[Java](https://developer.android.com/reference/androidx/wear/protolayout/TriggerBuilders.Trigger "View this page in Java")

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```
@RequiresSchemaVersion(major = 1, minor = 200)
interface TriggerBuilders.Trigger
```

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Known direct subclasses  
[TriggerBuilders.OnVisibleOnceTrigger](https://developer.android.com/reference/kotlin/androidx/wear/protolayout/TriggerBuilders.OnVisibleOnceTrigger),[TriggerBuilders.OnVisibleTrigger](https://developer.android.com/reference/kotlin/androidx/wear/protolayout/TriggerBuilders.OnVisibleTrigger)  

|-------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------|
| [TriggerBuilders.OnVisibleOnceTrigger](https://developer.android.com/reference/kotlin/androidx/wear/protolayout/TriggerBuilders.OnVisibleOnceTrigger) | Triggers only once when the layout visibility state turns from invisible to fully visible for the first time. |
| [TriggerBuilders.OnVisibleTrigger](https://developer.android.com/reference/kotlin/androidx/wear/protolayout/TriggerBuilders.OnVisibleTrigger)         | Triggers when the layout visibility state turns from invisible to fully visible.                              |

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Interface defining the triggers that can be fired. These triggers can be used to allow acting on events. For example some animations can be set to start based on a trigger.