How to listen the method channel result - flutter

Question

On firebase service, there are two method onNewToken and onMessageReceived, the code I tried to implement to get the new token and remote message from them on android side, then feedback to flutter side. But I have no idea how to listen the method channel when it has a result.
// Service
public class FluttersService extends FirebaseMessagingService {
#Override
public void onNewToken(String token) {
...
LocalBroadcastManager.getInstance(getApplicationContext()).sendBroadcast(intent);
}
#Override
public void onMessageReceived(RemoteMessage message) {
...
LocalBroadcastManager.getInstance(getApplicationContext()).sendBroadcast(intent);
}
}
// Plugin
public class FlutterPushPlugin extends BroadcastReceiver
implements MethodCallHandler, NewIntentListener, FlutterPlugin, ActivityAware {
// BroadcastReceiver implement
#Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (action == null) {
return;
}
if (action.equals(ACTION_TOKEN)) {
String token = intent.getStringExtra(EXTRA_TOKEN);
methodChannel.invokeMethod("onToken", token);
} else if (action.equals(ACTION_REMOTE_MESSAGE)) {
RemoteMessage message =
intent.getParcelableExtra(EXTRA_REMOTE_MESSAGE);
if (message == null) return;
Map<String, Object> content = remoteMessageToMap(message);
methodChannel.invokeMethod("onMessage", content);
}
}
#Override
public void onMethodCall(final MethodCall call, #NonNull final Result result) {
switch (call.method) {
case "onToken":
// How to response the result to flutter side?
break;
case "onMessage":
// How to response the result to flutter side?
break;
default:
result.notImplemented();
return;
}
}
}

Answer 1

Use Event channel for sending an event to flutter from native.
A complete description is provided in the below article.
https://rvsevtag62.medium.com/event-channel-to-listen-to-broadcast-events-from-android-43a813672896