我有一个水平recyclerView，有28个元素。我想实现以下目标：一次只显示7个项目，如果用户向右滑动，则滚动到接下来的7个项目，如果向左滑动则相同，然后滚动到前7个项目。我尝试使用LinearSnapHelper之类的public class CustomSnapHelper extends LinearSnapHelper {
@Override
public int findTargetSnapPosition(RecyclerView.LayoutManager layoutManager, int velocityX, int velocityY) {
View centerView = findSnapView(layoutManager);
if (centerView == null) {
return RecyclerView.NO_POSITION;
}
int position = layoutManager.getPosition(centerView);
int targetPosition = -1;
if (layoutManager.canScrollHorizontally()) {
if (velocityX < 0) {
targetPosition = position - 7;
} else {
targetPosition = position + 7;
}
}
final int firstItem = 0;
final int lastItem = layoutManager.getItemCount() - 1;
targetPosition = Math.min(lastItem, Math.max(targetPosition, firstItem));
return targetPosition;
}
}
来解决它：
rw但问题是