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In some situations, FCM may not deliver a message.

MyFirebaseMessagingService.kt Override onDeletedMessages To use FirebaseMessagingService, you need to add the following in your After that, various OS behaviors such as Android O's

The time window may be shorter depending on OS delays incurred ahead ofĬalling onMessageReceived. Is provided, your service should handle any message within 20 seconds of receipt (10 seconds onĪndroid Marshmallow). In this case, the notification is delivered to the device’s system tray,Īnd the data payload is delivered in the extras of theįor more information about message types, see Messages with both notification and data payload, when received in the background. In thisĬase, the notification is delivered to the device’s system tray. Notification messages delivered when your app is in the background. OnMessageReceived is provided for most message types, with the following May interfere with your ability to complete your work. After that time, various OS behaviors such as Android O's

The time window may be shorter depending on OS delays incurred ahead of calling It should handle any message within 20 seconds of receipt (10 seconds on Android Your service should override the onMessageReceived and onDeletedMessagesĬallbacks. To receive messages, use a service that extends Notification messages or data messages, you’ll need to write code to handleįor an explanation of the difference between notification and data messages, I have a button on the first one and I want to show the second when it is clicked, but I get an error.Firebase notifications behave differently depending on the foreground/background In my Android application, I have two activity classes.