Jetpack Compose
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Notes: 09. Apply Error & Data Handling to the UI
The student materials have been reviewed and are updated as of September 2022.
In ui/bookReviewDetails/BookReviewDetailsActivity file, within BookRevBookReviewDetailsInformationiewItem() composable function, replace CoilImage() composable by AsyncImage() composable with updated parameters. CoilImage composable is old and not compatible with current Jetpack Compose version.
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Demo
To make sure your forms don’t let the user store empty data, you need a way to disable actions or show errors, when the data is invalid. To do that, you need to apply error and data handling!
InputField(
value = bookNameState.value,
...
isInputValid = bookNameState.value.isNotEmpty()
)
InputField(
value = bookDescriptionState.value,
...
isInputValid = bookDescriptionState.value.isNotEmpty()
)
ActionButton(
...
isEnabled = bookNameState.value.isNotEmpty()
&& bookDescriptionState.value.isNotEmpty()
&& _addBookState.value.genreId.isNotEmpty()
)
isInputValid = bookUrl.value.isNotEmpty()
...
isInputValid = bookNotes.value.isNotEmpty()
...
val pickedBook = _bookReviewState.value?.bookAndGenre
isEnabled = bookNotes.value.isNotEmpty() && bookUrl.value.isNotEmpty()
&& pickedBook != null && pickedBook != EMPTY_BOOK_AND_GENRE
private val _bookReviewDetailsState = mutableStateOf(EMPTY_BOOK_REVIEW)
private val _genreState = mutableStateOf(EMPTY_GENRE)
val bookReview = _bookReviewDetailsState.value
val genre = _genreState.value
Column(
modifier = Modifier
.fillMaxSize()
.scrollable(rememberScrollState(), orientation = Orientation.Vertical),
horizontalAlignment = Alignment.CenterHorizontally,
) {
Spacer(modifier = Modifier.height(16.dp))
Card(
modifier = Modifier
.size(width = 200.dp, height = 300.dp),
shape = RoundedCornerShape(16.dp),
elevation = 16.dp
) {
CoilImage(
data = bookReview.review.imageUrl,
contentScale = ContentScale.FillWidth,
contentDescription = null
)
}
Spacer(modifier = Modifier.height(16.dp))
Text(
text = bookReview.book.name,
fontWeight = FontWeight.Bold,
fontSize = 18.sp
)
Spacer(modifier = Modifier.height(6.dp))
Text(
text = genre.name,
fontSize = 12.sp
)
Spacer(modifier = Modifier.height(6.dp))
RatingBar(
modifier = Modifier.align(CenterHorizontally),
range = 1..5,
isSelectable = false,
isLargeRating = false,
currentRating = bookReview.review.rating
)
Spacer(modifier = Modifier.height(6.dp))
Text(
text = stringResource(
id = R.string.last_updated_date,
formatDateToText(bookReview.review.lastUpdatedDate)
),
fontSize = 12.sp
)
Spacer(modifier = Modifier.height(8.dp))
Spacer(
modifier = Modifier
.fillMaxWidth(0.9f)
.height(1.dp)
.background(
brush = SolidColor(value = Color.LightGray),
shape = RectangleShape
)
)
Text(
modifier = Modifier.padding(start = 20.dp, end = 20.dp, top = 8.dp, bottom = 8.dp),
text = bookReview.review.notes,
fontSize = 12.sp,
fontStyle = FontStyle.Italic
)
Spacer(
modifier = Modifier
.fillMaxWidth(0.9f)
.height(1.dp)
.background(
brush = SolidColor(value = Color.LightGray),
shape = RectangleShape
)
)