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[英]How can I add a stickyHeader to LazyVerticalGrid like LazyColumn in jetpack compose?
[英]How to use LazyColumn stickyHeader in combination with Paging in Android Jetpack Compose?
我已经用Paging实现LazyColumn
,但我现在也在尝试添加粘性标头。
stickyHeader()
function 在items()
() scope 中不可用,所以我看不出它应该如何工作。
@Composable
fun MovieList(movies: Flow<PagingData<Movie>>) {
val lazyMovieItems: LazyPagingItems<Movie> = movies.collectAsLazyPagingItems()
LazyColumn {
// TODO: Add sticky headers
items(lazyMovieItems) { movie ->
MovieItem(movie = movie!!)
}
}
}
如何添加stickyHeader
?
@Composable
fun MovieList(movies: Flow<PagingData<Movie>>) {
val lazyMovieItems = movies.collectAsLazyPagingItems()
LazyColumn {
val itemCount = lazyMovieItems.itemCount
var lastCharacter: Char? = null
for (index in 0 until itemCount) {
// Gets item without notifying Paging of the item access,
// which would otherwise trigger page loads
val movie = lazyMovieItems.peek(index)
val character = movie?.name?.first()
if (movie !== null && character != lastCharacter) {
stickyHeader(key = character) {
MovieHeader(character)
}
}
item(key = movie?.id) {
// Gets item, triggering page loads if needed
val movieItem = lazyMovieItems[index]
Movie(movieItem)
}
lastCharacter = character
}
}
}
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