How to implement a modular application structure to ensure its scalability and support?

To ensure scalability and support for an Android application, it is recommended to divide the project into modules with clearly defined responsibilities. This allows isolating functionality, speeding up build times, and simplifying testing.

Main approaches:

• Functional modules — each module is responsible for a specific functionality (e.g., authentication, profile, chat).
• General-purpose libraries — modules with common utilities, UI components, network clients.
• Feature modules — separate screens or sets of screens that can be enabled or disabled.

In Android Studio, separate Gradle modules are created for this purpose with their own dependencies. Modules interact through well-defined interfaces.

Example structure:

app/           // main application module
feature_auth/  // authentication module
feature_chat/  // chat module
common_ui/     // shared UI components
network/       // network clients and APIs

This approach facilitates maintenance, allows parallel work on different parts of the application, and scales the project.