createMutation.java

   //Create a mutation object
   Mutation mutation = UpdateCurrentTaskMutation.builder().id(id).title(title).version(version).build();

   //Create an object of apolloCall
   ApolloMutationCall<UpdateCurrentTaskMutation.Data> client = apolloClient.mutate(mutation)
               .refetchQueries(apolloQueryWatcher.operation().name());  

   //Create a callback object of type ResponseCallback
   ResponseCallback customCallback = new ResponseCallback(){
          @Override
          public void onSuccess(@NotNull Response<Object> response) {
          //Perform UI bindings accordingly.
       }

       /* Called when the request could not be executed due to cancellation, a connectivity problem or timeout.
       */ 
          @Override
          public void onSchedule(@NotNull ApolloException e, @NotNull Mutation<Operation.Data, Object, Operation.Variables> mutation) {
          //Perform UI bindings accordingly.
        }
   };

    /* Call the enqueue function present in the file Offix which takes in 3 parameters:
        1. apollo client 
        2. mutation object              
        3. ResponseCallback object
    */
    Offix.enqueue(apolloClient, mutation, customCallback);