我有一个需求，需要以一页为单位滚动Recyclerview。每个页面包含一个3x3项目的网格。
我使用了GridLayoutManager来实现网格，现在我正在尝试重写onScrolled()方法以实现按页滚动。我希望每次水平滚动显示3个项目，代表1页。
这是我的部分代码：
recyclerView = (RecyclerView) rootView.findViewById(R.id.sub_category_list_recyclerview);
recyclerView.setHasFixedSize(true);
gridLayoutManager = new GridLayoutManager(getContext(), rowCount, LinearLayoutManager.HORIZONTAL, false);
recyclerView.setLayoutManager(gridLayoutManager);
adapter = new SubCategoryGridLayoutAdapter(new ArrayList<SubCategoryViewItem>());
recyclerView.setAdapter(adapter);
recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
}
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
int visibleItemCount = gridLayoutManager.getChildCount();
int totalItemCount = gridLayoutManager.getItemCount();
int pastVisiblesItems = gridLayoutManager.findFirstVisibleItemPosition();
int lastitemPos = gridLayoutManager.findLastVisibleItemPosition();
if (dx > 0) {
//Right Scrolling
int moreItems = lastitemPos + 9;
if (totalItemCount > moreItems){
gridLayoutManager.scrollToPositionWithOffset(moreItems, 0);
}else {
gridLayoutManager.scrollToPositionWithOffset(totalItemCount, 0);
}
}
if (dx < 0) {
//Left Scrolling
int lessItems = pastVisiblesItems + 9;
if (lessItems < totalItemCount){
gridLayoutManager.scrollToPositionWithOffset(lessItems, 0);
}else {
gridLayoutManager.scrollToPositionWithOffset(totalItemCount, 0);
};
}
}
});