NavHost

NavHost is a component in Android development, specifically within the Jetpack Navigation component library. It is responsible for displaying fragments or composables based on the current destination in the navigation graph. Essentially, NavHost acts as a container that swaps out the UI elements as the user navigates through the application.

When defining a navigation graph, you associate a NavHost with it. This tells the NavHost which destinations are available and how to transition between them. As the user interacts with the app and triggers navigation actions, the NavHost updates its content to reflect the new destination. This ensures that only the relevant UI is displayed at any given time, contributing to a more efficient and seamless user experience.

NavHost is designed to work with both the Fragment-based navigation architecture and the Jetpack Compose UI toolkit. For Fragments, it manages the Fragment transactions. When using Compose, NavHost handles the composition and recomposition of composables corresponding to the current navigation route. This flexibility makes NavHost a central piece of modern Android navigation patterns. Its primary function is to facilitate the dynamic display of UI content based on the application's navigation state.