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

15. Challenge: Create an EmptyView

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Previous episode: 14. Connect the Components to the Scaffold. Next episode: 16. Conclusion

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In the previous episode, you prepared TaskListScreen but had no tasks to display. Instead of displaying a blank screen, you should show a view with the message No tasks yet**. In this challenge, you’ll an create an EmptyView Composable with the No tasks yet text and add it to the TaskListScreenContent.

@Composable
fun EmptyView(message: String) {
    Column(
        modifier = Modifier.fillMaxSize(),
        verticalArrangement = Arrangement.Center,
        horizontalAlignment = Alignment.CenterHorizontally
    ) {
        Icon(
            imageVector = Icons.Default.List,
            contentDescription =  stringResource(id = com.kodeco.android.listmaker.R.string.cd_list_icon),
            modifier = Modifier.size(100.dp)
        )
        Spacer(modifier = Modifier.height(16.dp))
        Text(
            text = message,
            style = MaterialTheme.typography.titleMedium
        )
    }
}

@Preview(showBackground = true)
@Composable
fun EmptyViewPreview() {
    EmptyView(message = "No tasks yet")
}

@Composable
fun TaskListContent(modifier: Modifier, tasks: List<TaskList>, onClick: (String) -> Unit) {
    if (tasks.isEmpty()) {
        EmptyView(message = stringResource(id = R.string.text_no_tasks))
    } else {
        LazyColumn(
            modifier = modifier,
            content = {
                items(tasks) {
                    ListItemView(
                        value = it.name,
                        onClick = onClick
                    )
                }
            }
        )
    }
}