Navigating between composables in Android Kotlin - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a NavController in Jetpack Compose?

NavController is an object that manages app navigation within Compose. It keeps track of the back stack and lets you move between composables (screens).

beginner

How do you define a navigation graph in Compose?

You use the NavHost composable with a NavController and define composable destinations inside it using composable() functions.

beginner

What does the navigate() function do?

It tells the NavController to move to a different composable screen by specifying the route name.

intermediate

How can you pass data between composables during navigation?

You can include parameters in the route string and retrieve them in the destination composable using NavBackStackEntry arguments.

beginner

Why is it important to handle the back stack in navigation?

Handling the back stack ensures users can go back to previous screens naturally, like pressing the device back button, improving user experience.

Which composable is used to set up navigation destinations in Jetpack Compose?

A NavHost

B NavController

C NavGraphBuilder

D NavDestination

NavHost is the composable that hosts navigation destinations and connects them with the NavController.

How do you trigger navigation to another screen?

A Use a FragmentTransaction

B Use setContent() again

C Call startActivity()

D Call navigate() on NavController with the route

In Compose navigation, you call navigate() on the NavController with the destination route.

What is the purpose of the back stack in navigation?

A To store user data

B To keep track of navigation history

C To load images faster

D To manage network calls

The back stack keeps track of the order of screens visited so users can go back.

How can you pass a user ID to a detail screen in Compose navigation?

A Store it in SharedPreferences

B Use a global variable

C Include it as a parameter in the route string

D Use a database query

Passing parameters in the route string is the recommended way to send data between composables.

Which of these is NOT part of Compose navigation?

A FragmentManager

B NavHost

C NavController

D composable() destination

FragmentManager is used in traditional Android views, not in Compose navigation.

Explain how navigation works between composables in Jetpack Compose.

Think about how you move from one screen to another and how the app remembers where you were.

Describe how to pass data when navigating from one composable to another.

Consider how you might send a message or ID along with the navigation action.