如果在recyclerview中没有数据，则隐藏按钮

Question

我创建了一个应用程序，其中有多个edittext，一个带有recyclerviuew的按钮和一个设置为Gone的按钮。在Button上单击它，可以通过更改Recycelr视图和按钮的可见性将我的所有数据添加到recyclerview列表中。在我的自定义适配器中，我现在使用图像视图从位置删除项目，我希望如果它从列表中删除所有数据，则它应自动隐藏我的Button和recyclerview。

// Recycler_view适配器

 public class Myviewholder extends RecyclerView.ViewHolder {
        public TextView  land_Detail, area_detail, s_no1;
        public Button delete;


        public Myviewholder(View view) {
            super(view);

            land_Detail = view.findViewById(R.id.hint31);
            area_detail = view.findViewById(R.id.hint21);
            s_no1 = view.findViewById(R.id.hint11);
            delete = view.findViewById(R.id.hint41);

        }
    }

    public Land_adapters(List<Land_list> land_list, Context context) {
        this.laand_list = land_list;
        this.context = context;
    }


    @NonNull
    @Override
    public Land_adapters.Myviewholder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View itemView = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.land_list, parent, false);

        return new Myviewholder(itemView);
    }

    @Override
    public void onBindViewHolder(@NonNull Myviewholder holder, final int position) {
        final Land_list current_year = laand_list.get(position);

        holder.area_detail.setText("District :" + current_year.getDistrict_name() + "\n" + "Village :" + current_year.getVillage_name());

        holder.s_no1.setText(String.valueOf(position + 1));
        holder.land_Detail.setText("Acre :" + current_year.getAcre() + "\n" + "Kanal :" + current_year.getKanal() + "\n" + "Marla :" + current_year.getMarla());
        holder.delete.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Toast.makeText(context, "", Toast.LENGTH_SHORT).show();
                Land_list theRemovedItem = laand_list.get(position);
                // remove your item from data base
                laand_list.remove(position);  // remove the item from list
                notifyItemRemoved(position); // notify the adapter about the removed item

            }
        });
    }


    @Override
    public int getItemCount() {
        return laand_list.size();
    }

//我如何在mainactivity类中使用回收站

   public void final_step() {
        // marla_edit.setError(null);
        recyclerView = findViewById(R.id.recycler_view_last1);


        mAdapter1 = new Land_Adapter(last_Year1);
        recyclerView.setHasFixedSize(true);
        RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(this);
        recyclerView.setLayoutManager(mLayoutManager);
        recyclerView.setAdapter(mAdapter1);


        Land_list last_year1 = new Land_list(land_acre, land_kanal, village_selected1, land_marla, district_selected1, teshil_selected1, block_selected1, block_code, teshil_code1, village_code1, district_code);
        last_Year1.add(last_year1);
        mAdapter1.notifyDataSetChanged();
if (!(last_Year1.size() == 0)) {
    RelativeLayout linearLayout = findViewById(R.id.linear123);


    recyclerView.setVisibility(View.VISIBLE);
    next_button.setVisibility(View.VISIBLE);

}
else
{
    next_button.setVisibility(View.INVISIBLE);

}

//我只是想当它在Recycelr视图中按Delete图像时，应该自动隐藏我的按钮。

Answer 1

您可以使用界面来通知片段/活动，列表为空。适配器如下：