Firebase: How to set default notification channel

问题:

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.

回答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.