There are some reasons for this issue and sometimes its depends on device CM having two ways to send notifications Data messages { it will trigger the FirebaseMessagingService onMessageReceived method. Notification Messages { Notification messages are delivered to the system notification tray when the app is in the background. onMessageReceived method of your FirebaseMessagingService To avoid the issue of not receving messages <service If we set to true, this service with be automatically stopped when the user remove a task rooted in an activity owned by the application. The default is false. If the flag is false, there is an onTaskRemoved callback in your Service class. In this case you can detect the onTaskRemoved on "swipe" event and you can again start the FirebaseMessagingService
"message":{
"token":"bk3RNwTe3H0:CI2k_HHwgIpoDKCIZvvDMExUdFQ3P1...",
"data":{
"Nick" : "Mario",
"body" : "great match!",
"Room" : "PortugalVSDenmark"
}
}
}
it will not work on some devices, when an app is in the background.
"message":{
"token":"bk3RNwTe3H0:CI2k_HHwgIpoDKCIZvvDMExUdFQ3P1...",
"notification":{
"title":"Portugal vs. Denmark",
"body":"great match!"
}
}
}
For apps in the foreground, messages are handled by a callback function
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android:name="com.yourapp.SERVICE"
android:stopWithTask="false" />
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