Add Android API to delete channel and channel group

android/src/main/java/io/invertase/firebase/notifications/RNFirebaseNotificationManager.java

@@ -129,6 +129,18 @@ public class RNFirebaseNotificationManager {
     }
   }
 
+  public void deleteChannelGroup(String groupId) {
+    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+      notificationManager.deleteNotificationChannelGroup(groupId);
+    }
+  }
+
+  public void deleteChannel(String channelId) {
+    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+      notificationManager.deleteNotificationChannel(channelId);
+    }
+  }
+
   public void displayNotification(ReadableMap notification, Promise promise) {
     Bundle notificationBundle = Arguments.toBundle(notification);
     displayNotification(notificationBundle, promise);

android/src/main/java/io/invertase/firebase/notifications/RNFirebaseNotifications.java

@@ -157,6 +157,18 @@ public class RNFirebaseNotifications extends ReactContextBaseJavaModule implemen
     notificationManager.createChannels(channelsArray);
     promise.resolve(null);
   }
+
+  @ReactMethod
+  public void deleteChannelGroup(String channelId, Promise promise) {
+    notificationManager.deleteChannelGroup(channelId);
+    promise.resolve(null);
+  }
+
+  @ReactMethod
+  public void deleteChannel(String channelId, Promise promise) {
+    notificationManager.deleteChannel(channelId);
+    promise.resolve(null);
+  }
   //////////////////////////////////////////////////////////////////////
   // End Android specific methods
   //////////////////////////////////////////////////////////////////////

lib/index.d.ts

@@ -1097,6 +1097,8 @@ declare module 'react-native-firebase' {
           channelGroups: Android.ChannelGroup[]
         ): Promise<void>;
         createChannels(channels: Android.Channel[]): Promise<void>;
+        deleteChannelGroup(groupId: string): Promise<void>;
+        deleteChannel(channelId: string): Promise<void>;
       }
 
       interface Notifications {

lib/modules/notifications/AndroidNotifications.js

@@ -91,4 +91,32 @@ export default class AndroidNotifications {
     }
     return Promise.resolve();
   }
+
+  deleteChannelGroup(groupId: string): Promise<void> {
+    if (Platform.OS === 'android') {
+      if (typeof groupId !== 'string') {
+        throw new Error(
+          `AndroidNotifications:deleteChannelGroup expects an 'string' but got type ${typeof groupId}`
+        );
+      }
+      return getNativeModule(this._notifications).deleteChannelGroup(
+        groupId
+      );
+    }
+    return Promise.resolve();
+  }
+
+  deleteChannel(channelId: string): Promise<void> {
+    if (Platform.OS === 'android') {
+      if (typeof channelId !== 'string') {
+        throw new Error(
+          `AndroidNotifications:deleteChannel expects an 'string' but got type ${typeof channelId}`
+        );
+      }
+      return getNativeModule(this._notifications).deleteChannel(
+        channelId
+      );
+    }
+    return Promise.resolve();
+  }
 }