CoinSphere - Cryptocurrency Market Mobile application

CoinSphere is a modern Android mobile app built using Kotlin and Jetpack Compose. It allows users to view real-time cryptocurrency prices, explore detailed coin information, and manage a list of their favorite coins. Designed with a clean UI and powered by reactive architecture, CoinSphere delivers a fast and smooth crypto tracking experience.

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Screenshots

SplashScreen	Loading Screen	Market Screen

Search Screen	Settings Screen	Error Screen

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Model-View-ViewModel

MVVM is a software architectural pattern that separates the presentation logic (View) from the business logic (Model) and introduces a middle layer (ViewModel) to mediate communication between them. This design pattern promotes better code organization, testability, and maintainability of Android applications.

Core Features

• Live Market Data — Displays real-time prices, ranks, and change percentages of popular cryptocurrencies
• Search for coins — Search for coins
• Coin Details View — See in-depth info about each coin, including price, change, symbol, and image
• Favorites — Users can mark coins they want to track closely
• Pull-to-Refresh — Easily refresh market data with a swipe
• Error/Empty State Handling — UI reacts gracefully to no internet or failed API calls
• Dark/Light Mode Support — Follows system theme preferences

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Tech Stack

Layer	Tool / Library
Language	Kotlin
UI Toolkit	Jetpack Compose
Architecture	MVVM
DI	Hilt
Networking	Retrofit + OkHttp
Async/Reactive	Coroutines + Flow
Image Loading	Coil
Navigation	Jetpack Compose Navigation
Local Storage	Room (for favorites)
State Handling	StateFlow, ViewModel
API Provider	CoinGecko (public API)

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Project Structure

com.coinsphere
│
├── data
│   ├── remote        # Retrofit API services and DTOs
│   ├── local         # Room database, DAOs, entities
│   └── repository    # Repository interface and implementation
│
├── di                # Hilt modules for dependency injection
│
├── ui
│   ├── screens
│   │   ├── market    # Main screen showing list of coins
│   │   ├── details   # Screen for individual coin info
│   │   └── favorites # User's favorite coins
│   └── components    # Reusable Composables (e.g., CoinItem, TopBar)
│
├── navigation        # Navigation graph and screen routes
│
├── utils             # Constants, formatters, and helper functions
│
└── MainActivity.kt   # App entry point and NavHost