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

16. Work with Strings

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Previous episode: 15. Learn About State Hoisting Next episode: 17. Challenge: Create a Custom Composable

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It’s time to tackle the next item on our programming to-do list: “Read the value of the slider after the user presses the Hit Me button.” But before you do that, I want to tell you about a very important data type you’ll use in your Android apps: “Strings”. You’ve already used this when working with the Text composable but let’s go a bit further.

text = { Text("The slider's value is $sliderValue") }

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

val sliderToInt = (sliderValue * 100).toInt()

ResultDialog(
  hideDialog = { alertIsVisible = false },
  sliderValue = sliderToInt // New Code
)

text = { Text(stringResource(id = R.string.result_dialog_message)) }
//    text = { Text("The slider's value is $sliderValue") }

<string name="result_dialog_message">The slider\'s value is %1$d.</string>

text = { Text(stringResource(id = R.string.result_dialog_message, sliderValue)) }

var alertIsVisible by rememberSaveable { mutableStateOf(false) }
var sliderValue by rememberSaveable { mutableStateOf(0.5f) }