SingleActivity

SingleActivity is a software architectural pattern for Android development that advocates for using a single Activity throughout the entire application lifecycle. The core idea is to delegate the responsibility of managing user interface states and navigation to a Fragment or other composition layer, rather than relying on multiple Activities to represent different screens or features. This approach aims to simplify navigation, reduce boilerplate code associated with Activity management, and improve overall application performance.

In a SingleActivity architecture, the main Activity typically hosts a navigation controller, such as the Navigation Component provided by Android Jetpack, which manages the transitions between different Fragments. These Fragments then handle their own UI elements, user interactions, and data presentation. This separation of concerns allows for more modular and testable code. Common implementations often involve a Fragment container within the single Activity's layout, with Fragments being swapped in and out of this container as the user navigates through the app. This pattern is particularly well-suited for modern Android development practices and integrates seamlessly with Jetpack components.