FirebaseMessaging

public class FirebaseMessaging extends Object

Top level Firebase Cloud Messaging singleton that provides methods for subscribing to topics and sending upstream messages.

In order to receive Firebase messages, declare an implementation of FirebaseMessagingService in the app manifest. To process messages, override base class methods to handle any events required by the application.

Client apps can send upstream messages back to the app server using the XMPP-based Cloud Connection Server. For example:

 FirebaseMessaging.getInstance().send(
     new RemoteMessage.Builder(SENDER_ID + "@gcm.googleapis.com")
     .setMessageId(id)
     .addData("key", "value")
     .build());

Constant Summary

String INSTANCE_ID_SCOPE Specifies scope used in obtaining a registration token when calling getToken()

Public Method Summary

synchronized static FirebaseMessaging
boolean
isAutoInitEnabled()
Determine whether FCM auto-initialization is enabled or disabled.
void
send(RemoteMessage message)
Sends message upstream to your app server.
void
setAutoInitEnabled(boolean enable)
Enable or disable auto-initialization of Firebase Cloud Messaging.
Task<Void>
subscribeToTopic(String topic)
Subscribes to topic in the background.
Task<Void>
unsubscribeFromTopic(String topic)
Unsubscribes from topic in the background.

Inherited Method Summary

Constants

public static final String INSTANCE_ID_SCOPE

Specifies scope used in obtaining a registration token when calling getToken()

Constant Value: "FCM"

Public Methods

public static synchronized FirebaseMessaging getInstance ()

public boolean isAutoInitEnabled ()

Determine whether FCM auto-initialization is enabled or disabled.

Returns
  • true if auto-init is enabled and false if auto-init is disabled

public void send (RemoteMessage message)

Sends message upstream to your app server.

When there is an active connection the message will be sent immediately, otherwise the message will be queued up to the time to live (TTL) set in the message.

public void setAutoInitEnabled (boolean enable)

Enable or disable auto-initialization of Firebase Cloud Messaging.

When enabled, FCM generates a registration token on app startup if there is no valid one and generates a new token when it is deleted (which prevents deleteInstanceId() from stopping the periodic sending of data). This setting is persisted across app restarts and overrides the setting specified in your manifest.

By default, FCM auto-initialization is enabled. If you need to change the default, (for example, because you want to prompt the user before FCM generates/refreshes a registration token on app startup), add to your application’s manifest:

            <meta-data android:name="firebase_messaging_auto_init_enabled" android:value="false" />
 
Parameters
enable Whether FCM should auto-initialize.

public Task<Void> subscribeToTopic (String topic)

Subscribes to topic in the background.

The subscribe operation is persisted and will be retried until successful.

This uses a Firebase Instance ID token to identify the app instance and periodically sends data to the Firebase backend. To stop this, see deleteInstanceId().

Parameters
topic The name of the topic to subscribe. Must match the following regular expression: "[a-zA-Z0-9-_.~%]{1,900}".
Returns
  • A task that will be completed when the topic has been successfully subscribed to.

public Task<Void> unsubscribeFromTopic (String topic)

Unsubscribes from topic in the background.

The unsubscribe operation is persisted and will be retried until successful.

This does not stop FirebaseInstanceId's periodic sending of data started by subscribeToTopic(String). To stop this, see deleteInstanceId().

Parameters
topic The name of the topic to unsubscribe from. Must match the following regular expression: "[a-zA-Z0-9-_.~%]{1,900}".
Returns
  • A task that will be completed when the topic has been successfully unsubscribed from.