ELearning App for Android

need to develop an ELearning App for Android - user registration - login - list available courses - subscribe to a course - Courses --> Chapters --> topics - track progress per user - completed topics / left out topics - current topic Topic can be a - View documents / Contents from server - view presentations[ slides - sequence of images] - Quiz [ set of questions - with options / inputbox ] - Video - play videos from Server - Play Audio from Server