Increase discovery and ease of use for your apps. With App Actions, you declare support for built-in intents, which model common ways that users express tasks or find information, such as ordering a meal, booking a ride, or checking an account balance.
The Assistant can then launch your Android app or display a slice to your users. App Actions is supported on devices running Android 5 (API level 21) and higher.
Add an actions.xml manifest to your Android app to declare support for built-in intents in a variety of categories to express your app's fulfillment capabilities to Google.