Ragraa is a frontend third-party client for Flex, made solely for the purpose of optimizing the user experience on Android.
Since the app doesn't have access to Flex API, it cannot login without having solved the recaptcha. So you must refresh (which just logs you in again) and solve the captcha that pops up to update your marks/attendance. Also, you have to choose the current semester (only once though, it remembers!) in the login screen.
Copyright 2015 Javier Tomás
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
The developer of this application does not have any affiliation with the content providers available.