Question

我有谷歌地图和群集数据，当我点击某个群集然后显示水平回收查看。我有一个imageButton，它是CardView中的下一个或上一个按钮，当我点击它然后cardView滚动到下一个位置。它工作得很完美，但我有一个问题。我的第一个cardView和最后一个CardView应该没有这个图像按钮，所以我尝试设置Visibility to Gone，如下所示：

private void nextImageButtonAction(final ViewHolder holder, final int position, MyClusterMarkerMapItem cluster){
                if(position == clusterDataList.size()-1){
                    Log.i("position", "position: " + position + " visibility GONE for next");
                    holder.nextImageButton.setVisibility(View.GONE);
                }else {
                    holder.nextImageButton.setOnClickListener(new View.OnClickListener() {
                        @Override
                        public void onClick(View v) {
                            int currentPosition = position;
                            currentPosition = currentPosition + 1;
                           // Log.i("pos", "currpos " + position + " nextPos " + currentPosition);
                            recyclerView.smoothScrollToPosition(currentPosition++);
                        }

                    });
                }
    }

    private void previousImageButtonAction(final ViewHolder holder, final int position, MyClusterMarkerMapItem cluster) {
        if (position == 0) {
            Log.i("position", "position: " + position + " visibility GONE for prev");
            holder.previousImageButton.setVisibility(View.GONE);
        } else {
            holder.previousImageButton.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    int currentPosition = position;
                    currentPosition = currentPosition - 1;
                    //Log.i("pos", "currpos " + position + " nextPos " + currentPosition);
                    recyclerView.smoothScrollToPosition(currentPosition++);
                }
            });
        }
    }

我在：

中运行此方法

  public void onBindViewHolder(final ViewHolder holder, final int position) {..My Method}

但是imageButton在第一张cardView中消失，但也在第一张或最后一张的cardView中消失，而最后一张cardview没有prev和下一张图片按钮，但应该有prev image按钮。那么我怎样才能在所有cardView中使用next和prev图像按钮而不是第一个应该只有next而且last应该只有prev

我的适配器及更多：

    public class ClusterInfoWindow extends Fragment {
    private MyClusterMarkerMapItem clusterData;
    private List<MyClusterMarkerMapItem> clusterDataList;
    public void setClusterData(MyClusterMarkerMapItem clusterData) {
        clusterDataList = new ArrayList<>();
        this.clusterData = clusterData;
    }
    public void setClusterDataList(List<MyClusterMarkerMapItem> clusterDataList) {
        this.clusterDataList = new ArrayList<>(clusterDataList);
    }
    private RecyclerView recyclerView;
    private RecyclerView.Adapter adapterRecyclerView;
    private RecyclerView.LayoutManager layoutManager;

    private  View rootView;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        rootView = inflater.inflate(R.layout.fragment_info_window_marker_map, container, false);
        setUpCardView(rootView);
        return rootView;
    }
    private void setUpCardView(View rootView){
        recyclerView = rootView.findViewById(R.id.recyclerViewInfoWindowMarker);
        layoutManager = new LinearLayoutManager(rootView.getContext(),LinearLayoutManager.HORIZONTAL,false); //horizontal
        recyclerView.setLayoutManager(layoutManager);
        recyclerView.setHasFixedSize(true);
        adapterRecyclerView = new AdapterRecyclerView(getActivity());
        recyclerView.setAdapter(adapterRecyclerView);
    }

    class AdapterRecyclerView extends RecyclerView.Adapter<AdapterRecyclerView.ViewHolder> {
        private Context context;
        public AdapterRecyclerView(Context context){
            this.context = context;
        }
        @Override
        public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.card_view_for_info_window_map,parent,false);
            ViewHolder viewHolder = new ViewHolder(view);
            return viewHolder;
        }

        @Override
        public void onBindViewHolder(final ViewHolder holder, final int position) {
//some function, some i put above in this post
}
 @Override
        public int getItemCount() {
            int itemCount = 0;
            if (clusterDataList.size() == 0)
                itemCount = 1;
            else if(clusterDataList.size() > 0 )
                itemCount = clusterDataList.size();
            return itemCount;
        }
        public  class ViewHolder extends RecyclerView.ViewHolder{
            private ImageButton nextImageButton;
            private ImageButton previousImageButton;

            public ViewHolder(View itemView) {
                super(itemView);

                nextImageButton = itemView.findViewById(R.id.cardViewNext);
                previousImageButton = itemView.findViewById(R.id.cardVievPrevious);

            }
        }

    }

}

Answer 1

只需将div_object_last添加到holder.nextImageButton.setVisibility(View.VISIBLE);声明

即可

<强> WHY ：
因为RecyclerView正在重用视图。一旦视图从顶部移出屏幕，它将移动到底部以表示下一个列表项。由于您已将按钮隐藏在其中，因此无法自动显示该按钮，您需要手动执行此操作。

如何在recyclerView中设置可见性小部件

1 个答案: