Pic Off makes photo challenges fun and effortless. Built natively with Kotlin, it allows users to challenge friends to take the best picture based on a specific theme.

The goal was to engineer a robust Single-Activity application utilizing MVVM architecture to handle complex state transitions seamlessly.

• Architecture: MVVM, Single Activity (Navigation Component), ViewBinding
• Core: Kotlin, Coroutines, LiveData
• Backend (Firebase): Auth (Google Sign-In), Realtime Database, Storage
• Key Features: AlarmManager (Resilient Notifications), Camera Intents, Offline Support

Managing the lifecycle of a challenge between two users is handled via a state machine in the MainViewModel:

graph LR
 A[Sent] --> B[Open]
 B --> C[Vote Recipient]
 C --> D[Vote Challenger]
 D --> E[Result]
 E --> F[Done]

1. Sent: Challenger sends request.
2. Open: Recipient accepts and uploads photo.
3. Vote Recipient: Recipient votes.
4. Vote Challenger: Challenger votes.
5. Result: Winner is calculated and displayed.
6. Done: Challenge completed.

1. Clone the repo

   git clone https://github.com/libaum/PicOff.git

2. Firebase Setup

   • Add your own google-services.json to the /app directory.

3. Build

   • Open in Android Studio (Electric Eel+) and run (minSdk 26).

Built with ❤️ and Kotlin for Android