Your First Kotlin Android App: Polishing the App

Aug 22 2023 · Kotlin 1.8.20, Android 13, Android Studio Flamingo | 2022.2.1

Part 3: Finish the App

21. Challenge: Implement the Back Button

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Previous episode: 20. Add Navigation to the App Next episode: 22. Setup App Icon & Display Name

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Now is time for your first challenge in this part. For this, I want you to add the back button functionality in the TopAppBar of the Scaffold and the back Button in the main content inside the AboutScreen. You’ll be following the same process of state hoisting from the previous episode.

fun AboutScreen(onNavigateBack: () -> Unit) {
// In the TopAppBar
IconButton(onClick = { onNavigateBack() }) {

// In the Button in the main content
  onClick = { onNavigateBack() },
) {
AboutScreen(onNavigateBack = {})
composable("about") {
  AboutScreen(onNavigateBack = { navController.navigateUp() }) // Updated Code