Architecture of Mobile Applications

Layers of Mobile App Architecture

Mobile apps are often structured into layers, each responsible for a distinct set of functionalities. This layered approach promotes modularity, maintainability, and separation of concerns. While the specific layers and their names might vary slightly, the core concepts remain consistent. Think of it like a multi-story building, where each floor has a specific purpose.

• Presentation Layer (UI Layer) or (UI/UX): This is the topmost layer, responsible for interacting with the user. It comprises the user interface elements (buttons, text fields, lists, etc.) and handles user input. This layer is concerned with visual presentation and user experience. It should be thin and focused solely on UI logic. It handles user interactions and visual elements. Technologies: Jetpack Compose, SwiftUI, React Native components.
• Business Logic Layer (Application Layer/Domain Layer): This layer contains the core logic of the application. It defines the rules, processes, and computations that the app performs. It acts as the brain of the app, processing data and coordinating between other layers. This layer should be independent of the UI and data access layers.
• Data Access Layer (Persistence Layer): This layer handles the storage and retrieval of data. It interacts with databases, APIs, and other data sources. It abstracts the underlying data storage mechanism from the business logic layer. This layer might use local databases, cloud storage, or network requests to fetch and persist data.
• Data Storage Layer (Infrastructure Layer): This is the lowest layer, responsible for physically storing the data. It might include local databases (SQLite), files, cloud storage (Firebase, AWS S3), or remote servers. This layer is often abstracted away by the data access layer.