在通过拖放重新排序后,可以通过以下函数获得新元素的RecyclerView顺序:
public List<Integer> getNewOrder(RecyclerView recyclerView) {
List<Integer> newOrder = new ArrayList<>();
RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
if (layoutManager instanceof LinearLayoutManager) {
LinearLayoutManager linearLayoutManager = (LinearLayoutManager) layoutManager;
int firstVisibleItemPosition = linearLayoutManager.findFirstVisibleItemPosition();
int lastVisibleItemPosition = linearLayoutManager.findLastVisibleItemPosition();
for (int i = firstVisibleItemPosition; i <= lastVisibleItemPosition; i++) {
newOrder.add(i);
}
} else if (layoutManager instanceof GridLayoutManager) {
GridLayoutManager gridLayoutManager = (GridLayoutManager) layoutManager;
int spanCount = gridLayoutManager.getSpanCount();
int firstVisibleItemPosition = gridLayoutManager.findFirstVisibleItemPosition();
int lastVisibleItemPosition = gridLayoutManager.findLastVisibleItemPosition();
for (int i = firstVisibleItemPosition; i <= lastVisibleItemPosition; i++) {
int row = i / spanCount;
int column = i % spanCount;
int newPosition = column * spanCount + row;
newOrder.add(newPosition);
}
} else if (layoutManager instanceof StaggeredGridLayoutManager) {
StaggeredGridLayoutManager staggeredGridLayoutManager = (StaggeredGridLayoutManager) layoutManager;
int spanCount = staggeredGridLayoutManager.getSpanCount();
int[] positions = new int[spanCount];
int firstVisibleItemPosition = staggeredGridLayoutManager.findFirstVisibleItemPositions(positions)[0];
int lastVisibleItemPosition = staggeredGridLayoutManager.findLastVisibleItemPositions(positions)[0];
for (int i = firstVisibleItemPosition; i <= lastVisibleItemPosition; i++) {
newOrder.add(i);
}
}
return newOrder;
}
这个函数根据RecyclerView的布局管理器类型,分别处理线性布局、网格布局和瀑布流布局。通过调用不同的布局管理器的方法,可以获取到可见范围内的新元素的顺序,并将其添加到一个列表中返回。
这个函数适用于需要在拖放重新排序后获取新元素顺序的场景,例如在一个图片列表中,用户可以通过拖放图片来改变它们的顺序,然后可以使用这个函数获取到新的顺序,以便进行后续的处理。
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