Your First Kotlin Android App: An App From Scratch

Aug 15 2023 · Kotlin 1.8.20, Android 13, Android Studio Flamingo | 2022.2.1

Part 2: Manage Data in Jetpack Compose

14. Understand State in Jetpack Compose

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Previous episode: 13. Handle a Click Interaction Next episode: 15. Learn About State Hoisting

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A key part of programming in Jetpack Compose is state. Rather than start with the computer science definition of state, let’s go with something that might be a little more familiar: the dashboard of a car.

var alertIsVisible by remember { mutableStateOf(false) }

@Composable
fun ResultDialog(
  modifier: Modifier = Modifier
) {
  AlertDialog(
    onDismissRequest = {},
    confirmButton = {
      TextButton(
        onClick = {}
      ) {
        Text(stringResource(id = R.string.result_dialog_button_text))
      }
    },
    title = { Text(stringResource(id = R.string.result_dialog_title)) },
    text = { Text(stringResource(id = R.string.result_dialog_message)) }
  )
}

ResultDialog()

@Composable
fun ResultDialog(
  hideDialog: () -> Unit, // New Code
  modifier: Modifier = Modifier
)
  //...

onDismissRequest = {
  hideDialog() // New Code
},
//...
    TextButton(
      onClick = {
        hideDialog() // New Code
      }
    )
//...

ResultDialog(
  hideDialog = { alertIsVisible = false }
)