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 1: Get Started with Android Development

07. Build the Game UI

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Previous episode: 06. Get Started with Jetpack Compose Next episode: 08. Modify Composables

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When you make an Android app, you build the layout using Composable functions or Composables for short. Composables in Android are a collection of layout components which you use to build the app鈥檚 UI. You can also call them components or widgets.

@Composable
fun GameScreen() {

}
Surface(modifier = Modifier.fillMaxSize(), color = MaterialTheme.colorScheme.background) {
  GameScreen() // New Code
}
...
fun GameScreenPreview() { // Updated Code
  ...
    GameScreen() // New Code
  ...
}
Text("PUT THE BULLSEYE AS CLOSE AS YOU CAN TO")
Text("89")
...
Column {
  Text("PUT THE BULLSEYE AS CLOSE AS YOU CAN TO")
  Text("89")
}
...
Column(
  horizontalAlignment = Alignment.CenterHorizontally,
)
...
Text("89", fontSize = 32.sp, fontWeight = FontWeight.Bold)
Slider(
  value = 0.5f,
  valueRange = 0.01f..1f,
  onValueChange = { }
)
Text("1")
Slider(
  ...
)
Text("100")
Row(
  verticalAlignment = Alignment.CenterVertically,
)
Button(onClick = { }) {
  Text("HIT ME")
}