The Firebase Cloud Messaging Android Quickstart app demonstrates registering an Android app for notifications and handling the receipt of a message. InstanceID allows easy registration while FirebaseMessagingService and FirebaseInstanceIDService enable token refreshes and message handling on the client.
NOTE: This sample contains identical code for both Java and Kotlin. However, there can only be one service in each app that receives FCM messages. If multiple are declared in the Manifest then the first one will be chosen.
In order to make the Java messaging sample functional, you must
remove the following from the
<intent-filter> <action android:name="com.google.firebase.MESSAGING_EVENT" /> </intent-filter>
Use Firebase console to send FCM messages to device or emulator.
If incoming FCM messages do not specify an Android notification channel, you can indicate to FCM what channel should be used as the default by adding a metadata element to your application manifest. In the metadata element specify the ID of the channel that should be used by default by FCM.
<meta-data android:name="com.google.firebase.messaging.default_notification_channel_id" android:value="default_channel_id"/>
Note: You are still required to create a notification channel in code with an ID that matches the one defined in the manifest. See the Android docs for more.
Setting a custom default icon allows you to specify what icon is used for notification messages if no icon is set in the notification payload. Also use the custom default icon to set the icon used by notification messages sent from the Firebase console. If no custom default icon is set and no icon is set in the notification payload, the application icon (rendered in white) is used.
You can also define what color is used with your notification. Different android versions use this settings in different ways: Android < N use this as background color for the icon. Android >= N use this to color the icon and the app name.
See the docs for more.
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