1. NAVIGATION COMPONENTS¶
1.1. Introducing Navigation Component¶
Navigation around an app ,by which i mean moving from one screen to another is an absolutely fundamental part of Android Development Navigation refers to the interactions that allow users to navigate across, into, and back out from the different pieces of content within your app. Android Jetpack’s Navigation component helps you implement navigation, from simple button clicks to more complex patterns, such as app bars and the navigation drawer. The Navigation component also ensures a consistent and predictable user experience by adhering to an established
1.2. What is a navigation Component ?¶
“ A Navigation component is a collection of libraries ,a plugin and tooling for unifying and simplifying android navigation ”
1.3. Navigation Component Benefits¶
- Simplified setup for common navigation pattern
- Handling fragment transactions.
- Handling Up and Back actions correctly by default.
- Providing standardized resources for animations and transitions.
- Implementing and handling deep linking.
- Including Navigation UI patterns, such as navigation drawers and bottom navigation, with minimal additional work.
- Safe Args - a Gradle plugin that provides type safety when navigating and passing data between destinations.
- ViewModel support - you can scope a ViewModel to a navigation graph to share UI-related data between the graph’s destinations.
- Navigation Graph Support for
- Fragments
- Activities
- Can also be extended to work with custom destination
- Navigation Component parts
- The Navigation component consists of three key parts that are:
- Navigation graph
- NavHost
- NavController
As you navigate through your app, you tell the NavController that you want to navigate either along a specific path in your navigation graph or directly to a specific destination. The NavController then shows the appropriate destination in the NavHost. Navigation graph(New Resources): An XML resource that contains all navigation-related information in one centralized location. This includes all of the individual content areas within your app, called destinations, as well as the possible paths that a user can take through your app NavHost(layout): An empty container that displays destinations from your navigation graph. The Navigation component contains a default NavHost implementation, NavHostFragment, that displays fragment destinations. NavController(fragment): An object that manages app navigation within a NavHost. The NavController orchestrates the swapping of destination content in the NavHost as users move throughout your app