Firebase: How to set default notification channel in Android app?

Question

How to set default notification channel for notification messages that come when an app is in the background? By default, these messages use "Miscellaneous" channel.

Answer 1

As you can see here in the official docs, you need to add the following metadata element in your AndroidManifest.xml within the application component:

<meta-data     android:name="com.google.firebase.messaging.default_notification_channel_id"     android:value="@string/default_notification_channel_id"/> 

This default channel will be used when notification message has no specified channel, or if the channel provided has not yet been created by the app.

Answer 2

You need to have registered a channel using NotificationManager CreateNotificationChannel.

This example uses c# in Xamarin, but is broadly applicable elsewhere

private void ConfigureNotificationChannel() {     if (Build.VERSION.SdkInt < BuildVersionCodes.O)     {         // Notification channels are new in API 26 (and not a part of the         // support library). There is no need to create a notification         // channel on older versions of Android.         return;     }      var channelId = Resources.GetString(Resource.String.default_notification_channel_id);     var channelName = "Urgent";     var importance = NotificationImportance.High;      //This is the default channel and also appears in the manifest     var chan = new NotificationChannel(channelId, channelName, importance);      chan.EnableVibration(true);     chan.LockscreenVisibility = NotificationVisibility.Public;      var notificationManager = (NotificationManager)GetSystemService(NotificationService);     notificationManager.CreateNotificationChannel(chan);  } 

This channel should be unique eg com.mycompany.myapp.urgent

You then add a reference to a string inside the application tag in the AndroidManifest.xml

<application android:label="MyApp" android:icon="@mipmap/icon">     <meta-data android:name="com.google.firebase.messaging.default_notification_channel_id" android:value="@string/default_notification_channel_id" /> </application> 

Finally, setup the string in strings.xml

<?xml version="1.0" encoding="UTF-8" ?> <resources>     <string name="default_notification_channel_id">com.mycompany.myapp.urgent</string> </resources>