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