#android #android-recyclerview #recyclerview-layout #staggered-gridview #staggeredgridlayout
#Android #android-recyclerview #recyclerview-layout #в шахматном порядке-gridview #staggeredgridlayout
Вопрос:
StaggeredLayoutManager иногда приводит к нарушению порядка расположения ячеек во время прокрутки при попытке их настройки. У меня есть headerView и NormalViews в моем RecyclerView. Ниже приведен код настройки:
int spacing = (int) getResources().getDimension(R.dimen.post_item_spacing);
mBindings.rvPosts.addItemDecoration(new PostsEqualGapItemDecoration(AppConstants.POSTS_SPAN_COUNT, spacing));
mPostsLayoutManager.setGapStrategy(StaggeredGridLayoutManager.GAP_HANDLING_MOVE_ITEMS_BETWEEN_SPANS);
mBindings.rvPosts.setLayoutManager(mPostsLayoutManager);
mProfileAdapter.setRecyclerView(mBindings.rvPosts);
mBindings.rvPosts.setAdapter(mAdapter);
mBindings.rvPosts.setNestedScrollingEnabled(false);
Класс ItemDecoration:
public class PostsEqualGapItemDecoration extends RecyclerView.ItemDecoration {
private int spanCount;
private int spacing;
public PostsEqualGapItemDecoration(int spanCount, int spacing) {
this.spanCount = spanCount;
this.spacing = spacing;
}
@Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
StaggeredGridLayoutManager.LayoutParams layoutParams = (StaggeredGridLayoutManager.LayoutParams) view.getLayoutParams();
if (layoutParams.isFullSpan()) {
outRect.set(0, 0, 0, 0);
} else {
int spanIndex = layoutParams.getSpanIndex();
int layoutPosition = layoutParams.getViewLayoutPosition();
int itemCount = parent.getAdapter().getItemCount();
boolean leftEdge = spanIndex == 0;
boolean rightEdge = spanIndex == (spanCount - 1);
boolean topEdge = spanIndex < spanCount;
boolean bottomEdge = layoutPosition >= (itemCount - spanCount);
int halfSpacing = spacing / 2;
/**
* Updated values to keep cells width same and spacing from left and right
* most item to be double than gap between items themselves.
*/
outRect.set(
leftEdge ? spacing * 2 : rightEdge ? 0 : spacing,
topEdge ? spacing : halfSpacing,
rightEdge ? spacing * 2 : leftEdge ? 0 : spacing,
bottomEdge ? spacing : 0
);
}
}
}
Скриншот:
Ответ №1:
You have to write custom item decoration for that case to your child item views
public class SpacesItemDecoration extends RecyclerView.ItemDecoration {
private int space;
public SpacesItemDecoration(int space) {
this.space = space;
}
@Override
public void getItemOffsets(Rect outRect, View view,
RecyclerView parent, RecyclerView.State state) {
outRect.left = space;
outRect.right = space;
outRect.bottom = space;
// Add top margin only for the first item to avoid double space between items
if (parent.getChildLayoutPosition(view) == 0) {
outRect.top = space;
} else {
outRect.top = 0;
}
}
}
Комментарии:
1. Уже используется пользовательский элемент декоратора. Я также добавил его код, пожалуйста, проверьте.