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

19. Create an About Page

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Previous episode: 18. Introduction Next episode: 20. Add Navigation to the App

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About Page Strings

🎉 Bullseye 🎉' This is Bullseye, the game where you can win points and earn fame by dragging a slider.\nYour goal is to place the slider as close as possible to the target value. The closer you are, the more points you score.\nEnjoy! Go Back! About Bullseye



import androidx.compose.runtime.Composable

@Composable
fun AboutScreen() {

}

@Preview(showBackground = true, device = Devices.AUTOMOTIVE_1024p, widthDp = 864, heightDp = 432)
@Composable
fun AboutScreenPreview() {
  AboutScreen()
}

Scaffold() {

}

@OptIn(ExperimentalMaterial3Api::class) // New Code
@Composable
fun AboutScreen() {
  Scaffold() {

  }
}

Scaffold(
  // New Code Start
  topBar = {
    TopAppBar(
      title = { Text(stringResource(id = R.string.about_page_title)) },
      navigationIcon = {
        IconButton(onClick = { }) {
          Icon(
            imageVector = Icons.Filled.ArrowBack,
            contentDescription = stringResource(id = R.string.back_button_text)
          )
        }
      },
      colors = TopAppBarDefaults.smallTopAppBarColors(
        containerColor = MaterialTheme.colorScheme.primary,
        titleContentColor = MaterialTheme.colorScheme.onPrimary,
        navigationIconContentColor = MaterialTheme.colorScheme.onPrimary
      )
    )
  }
  // New Code End
) {

}

Scaffold(
  topBar = {
    //...
  },
) { paddingValues ->
  //... Add in the Content here
}

Column(
  horizontalAlignment = Alignment.CenterHorizontally,
  verticalArrangement = Arrangement.Center,
  modifier = Modifier
    .padding(paddingValues)
    .fillMaxSize()
) {

}

Text(
  text = stringResource(id = R.string.about_title_text),
  style = MaterialTheme.typography.displayMedium.copy(fontWeight = FontWeight.Bold)
)
Text(
  text = stringResource(id = R.string.about_bullseye_text),
  textAlign = TextAlign.Center,
  style = MaterialTheme.typography.bodyLarge,
  modifier = Modifier.padding(horizontal = 16.dp, vertical = 24.dp)
)
Button(
  onClick = { },
  shape = MaterialTheme.shapes.medium,
) {
  Text(text = stringResource(id = R.string.back_button_text))
}

.consumedWindowInsets(paddingValues)