An Android App, with a Calendar

I would like the application to consist of a main page containing a calendar that can be changed from Day View, to Week View and then to Month view which shows the subjects that the student should work on at certain times. The app should also be able to be used as a regular calendar app, that can add single events or repeating and creates reminders. And the algorithm takes into account the existing events and current timetable to organise the timetable so that single events (like dentist appointments, etc) are always fixed and will not be over ridden. There should also be a separate page, where you can add subjects/reminders and give the information regarding the subjects like deadlines, colours, and priority level and level of completion. For the initial version I would not need integration with an online database, but a local data base will be plenty to store the information. But for future versions I would like the ability to log in and save your calendar to the cloud so that you can access it. Furthermore for the android version I would like a widget which you can apply to the home screen if enabled and it will show the current days schedule/timetable. Lastly the app should be live, which means that if someone adds a subject it will instantly update the entire schedule/timetable to work with the new addition, which means if this subject has the highest priority it will be more common that the other subjects and it may reduce the other subjects time on the timetable. There are also many small details I would like to have included. Like being able to click events, or drag events around to place into a new area, and holding down and it brings up the details of the event which you can add and remove. DESIGN IS EXTREMELY IMPORTANT FOR ME