IMPORTANT: In July 2025, we stopped releasing new versions of KTX modules, and we removed the KTX libraries from the Firebase Android BoM (v34.0.0). If you use KTX APIs from the previously released KTX modules, we recommend that you migrate your app to use KTX APIs from the main modules instead. For details, see the FAQ about this initiative.

com.google.firebase.messaging

Contains public API classes for Firebase Cloud Messaging.

Classes

`FirebaseMessaging`	Top level Firebase Cloud Messaging singleton that provides methods for generating tokens and subscribing to topics.
`FirebaseMessagingService`	Base class for receiving messages from Firebase Cloud Messaging.
`RemoteMessage`	A remote Firebase Message.
`RemoteMessage.Builder`	Builder object for constructing `RemoteMessage` instances.
`RemoteMessage.Notification`	Remote Firebase notification details.

Exceptions

SendException

Firebase message send exception.

Annotations

RemoteMessage.MessagePriority

Priority of the message

Top-level functions summary

inline RemoteMessage

remoteMessage(to: String, crossinline init: RemoteMessage.Builder.() -> Unit)

Returns a RemoteMessage instance initialized using the init function.

Extension properties summary

FirebaseMessaging

Firebase.messaging

Returns the FirebaseMessaging instance of the default FirebaseApp.

Top-level functions

remoteMessage

inline fun remoteMessage(to: String, crossinline init: RemoteMessage.Builder.() -> Unit): RemoteMessage

Returns a RemoteMessage instance initialized using the init function.

Extension properties

messaging

val Firebase.messaging: FirebaseMessaging

Returns the FirebaseMessaging instance of the default FirebaseApp.