Question

实际上，我想在水平recyclerview中添加一个这样的功能，如果它是最后一个位置，它会自动滚动到下一个位置，有时它必须向前移动，有时它必须像instagram的过滤器一样向后移动单击可以自动滚动的视图。我不知道如何执行此任务。目前，根据我的逻辑，它只是向前滚动，但我不知道如何为向后滚动插入逻辑。

代码：

horzRview.addOnItemTouchListener(new RecyclerItemClickListener(ctx, horzRview, new RecyclerItemClickListener.OnItemClickListener() {
        @Override
        public void onItemClick(View view, int position) {

            if(position<adapter.getItemCount()-1)
            horzRview.getLayoutManager().smoothScrollToPosition(horzRview, null, position+1);

            else horzRview.getLayoutManager().smoothScrollToPosition(horzRview, null, position-1);

        }

        @Override
        public void onLongItemClick(View view, int position) {
        }
    }));

Answer 1

使用首选项STAP_TO_START创建SmoothScroller：

RecyclerView.SmoothScroller smoothScroller = new 
LinearSmoothScroller(context) {
   @Override protected int getVerticalSnapPreference() {
       return LinearSmoothScroller.SNAP_TO_START;
   }
};

现在，您可以设置滚动位置（其项目的位置）：

smoothScroller.setTargetPosition(position);

将该SmoothScroller传递给LayoutManager：

layoutManager.startSmoothScroll(smoothScroller);

Answer 2

public interface OnItemClickListener {
void onItemClick(View view , int position);
}
//in adapter class
public class Adpt extends 
RecyclerView.Adapter<Adpt.ViewHolder> {
Context context;
OnItemClickListener onItemClickListener;
public Adpt(Context context,OnItemClickListener onItemClickListener) {
this.context = context;
this.onItemClickListener = onItemClickListener;
}
//put your click on itemview 
holder.itemView.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View view) {

      onItemClickListener.onItemClick(view,position);


  }
});
//implement your interface when you will set your adapter
Adpt adpt = new Adpr(activity,new OnItemCLickListner(){
// put your logic here
});

Answer 3

我最终做了一个棘手的计算，即通过对第一个和最后一个完全可见的项进行平均，得到中间完全可见的项。然后我按如下方式应用我的逻辑：

代码：

horzRview.addOnItemTouchListener(new RecyclerItemClickListener(ctx, horzRview, new RecyclerItemClickListener.OnItemClickListener() {
        @Override
        public void onItemClick(View view, int position) {

            int avg =
                    (layoutManager.findFirstCompletelyVisibleItemPosition()+(layoutManager.findFirstCompletelyVisibleItemPosition()+1)+
                    layoutManager.findLastCompletelyVisibleItemPosition())/3;


            if(position>avg) horzRview.getLayoutManager().smoothScrollToPosition(horzRview, null, position+1);
            else if(position!=0) horzRview.getLayoutManager().smoothScrollToPosition(horzRview, null, position-1);
            else horzRview.getLayoutManager().smoothScrollToPosition(horzRview, null, 0);

        }

        @Override
        public void onLongItemClick(View view, int position) {
        }
    }));

如何在点击时滚动水平recyclerview？

3 个答案: