Your Second Kotlin Android App

Aug 29 2023 · Kotlin 1.8.21, Android 13, Android Studio Flamingo | 2022.2.1

Part 2: Create Your Views

12. Create Shared UI Components

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Previous episode: 11. Build a List Item View Next episode: 13. Use LazyLayouts

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You have created a list item view that can display a list of items in your app. In this episode, you’ll create more UI components that you can share among different screens in your app.

@OptIn(ExperimentalMaterial3Api::class)
@Composable
fun ListMakerTopAppBar(title: String, showBackButton: Boolean, onBackPressed: () -> Unit) {
    TopAppBar(
        title = {
            Text(text = title)
        },
        colors = TopAppBarDefaults.topAppBarColors(
            containerColor = MaterialTheme.colorScheme.primaryContainer
        ), navigationIcon = {
            if (showBackButton) {
                IconButton(onClick = onBackPressed) {
                    Icon(
                        imageVector = Icons.Default.ArrowBack,
                        contentDescription = stringResource(id = R.string.cd_back_icon)
                    )
                }
            }
        }
    )
}

@OptIn(ExperimentalMaterial3Api::class)
@Composable
fun ListMakerFloatingActionButton(
  title: String,
  inputHint: String,
  onFabClick: (String) -> Unit
) {
  var showDialog by remember { mutableStateOf(false) }
  var taskName by remember { mutableStateOf("") }

  FloatingActionButton(
    onClick = {
      showDialog = true
    },
    content = {
      Icon(
        imageVector = Icons.Default.Add,
        contentDescription = stringResource(id = R.string.cd_add_icon)
      )
    }
  )

  if (showDialog) {
    AlertDialog(
      onDismissRequest = { showDialog = false },
      title = { Text(text = title) },
      text = {
        OutlinedTextField(
          value = taskName,
          onValueChange = { taskName = it },
          label = { Text(text = inputHint) },
          singleLine = true
        )
      },
      confirmButton = {
        Button(
          onClick = {
            showDialog = false
            onFabClick(taskName)
            taskName = ""
          },
          content = {
            Text(text = stringResource(id = R.string.label_create))
          }
        )
      },
    )
  }
}