Gym Slot Booking Android App

Group fitness runs on capacity: a spin class has 22 bikes, a boxing batch has 16 bags, and when the 23rd person shows up somebody trains angry. Most gyms still manage this on a whiteboard or a WhatsApp broadcast — members can't see whether a class is full until they arrive, trainers don't know their headcount in advance, and no-shows silently burn prime-time slots. IronHouse moves the schedule onto members' phones. The home screen lists today's classes with a capacity bar per class that fills as bookings land; full classes lock with a waitlist option. Tapping a class opens the detail: trainer profile with certification and rating, intensity level, expected calorie burn and the equipment list, plus the plain-English rules (warm-up is mandatory, late entry closed). Booking is one tap; "My slots" holds upcoming reservations with cancellation, and the membership card screen carries the member ID the desk scans. Trainers get a headcount before the session starts. The build is Kotlin with a Firebase backend for realtime capacity — a clean, viva-friendly mobile + BaaS architecture.

1. The gym admin publishes the weekly class timetable: class, trainer, time, capacity and category.
2. Members open the app to today's schedule; capacity bars show exactly how full each class is.
3. Tapping a class shows the trainer, intensity, calorie estimate and equipment; the member books with one tap.
4. The booking writes to the realtime backend inside a transaction — the capacity bar updates for all members instantly.
5. If a class is full, the member joins the waitlist and is auto-promoted when someone cancels.
6. "My slots" lists upcoming bookings; cancelling more than 3 hours ahead is free and immediately frees the spot.
7. At the gym, the member shows the digital membership card; the desk verifies the booking. No-shows are recorded against the policy.

Tech stack:

• Kotlin (Android app language)
• Android Studio (build & layout tooling)
• Firebase Realtime Database / Firestore (live capacity sync)
• Firebase Authentication (member sign-in)
• Material Design 3 components
• MVVM architecture (ViewModel + StateFlow)
• Firebase Cloud Messaging (class reminders, waitlist alerts)
• Git version control

• [Today's class schedule] Every class with time, trainer and category chips (Strength, Cardio, Yoga, Combat) for filtering.
• [Live capacity bars] Each class shows booked-vs-capacity as a bar that fills in real time; full classes lock and offer a waitlist.
• [Class detail screen] Trainer profile (certification, experience, rating), intensity, calorie estimate, level and equipment list.
• [One-tap slot booking] Reserve a spot instantly; the capacity bar updates for everyone via realtime sync.
• [Membership card] Digital card with member ID, plan name and validity for desk verification.
• [My slots] Upcoming bookings with free cancellation up to 3 hours before class; cancellations free the spot immediately.
• [No-show policy engine] Two no-shows in a month pause prime-time booking for a week — enforced in backend rules, not trust.
• [Trainer headcount view] Trainers see expected attendance per session before it starts.

• Complete Kotlin Android app source code
• Firebase backend schema and security rules (capacity transactions, roles)
• Member app (schedule, detail, booking, membership card, my slots)
• Trainer headcount view
• Waitlist and no-show policy logic
• Project report PDF (problem, architecture, data model, transaction design, testing)
• PPT presentation for final review
• Viva Q&A preparation document (realtime sync, transactions, FCM, MVVM)