带有多个微调器问题的 Recyclerview 问题

问题描述

我的回收站视图中有 2 个微调器。现在我的第二个微调器值取决于第一个微调器选择的项目。

我能够绑定微调器 1 中的数据，但是当我尝试根据微调器 1 的 setonItemSelectedListener 绑定微调器 2 数据时，它只会绑定屏幕上的可见项目。

我想绑定微调器 2 数据，即使它在屏幕上不可见。我有以下适配器代码：

public class CustomerAdapter extends RecyclerView.Adapter<CustomerAdapter.CardViewHolder> {

    private ArrayList<MainDetails> mMainDetails;
    private Context mContext;

    public CustomerAdapter(Context mcontext,ArrayList<MainDetails> mainDetails) {
        mContext = mcontext;
        mMainDetails = mainDetails;
    }


    private Context getContext() {
        return mContext;
    }

    @Override
    public CardViewHolder onCreateViewHolder(ViewGroup viewGroup,int viewType) {
        Context context = viewGroup.getContext();
        View itemView = LayoutInflater.from(context).inflate(R.layout.row_bind_data,viewGroup,false);
        return new CardViewHolder(itemView);
    }


    @Override
    public void onBindViewHolder(final CardViewHolder cardViewHolder,int position) {

        final MainDetails testMainDetails = mMainDetails.get(position);

        ArrayAdapter<Products> spinnerUserAdapter = new ArrayAdapter<Products>(getContext(),R.layout.dropdown_item,testMainDetails.getUsers());
        spinnerUserAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        cardViewHolder.spinner1.setAdapter(spinnerUserAdapter);

        cardViewHolder.spinner1.setonItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent,View view,int position,long id) {
                try {
                    Products pp = (Products) parent.getSelectedItem();
                    ArrayAdapter<Orders> spinnerPPAdapter = new ArrayAdapter<Orders>(getContext(),R.layout.pc_estimator_dropdown_item,pp.getorders());
                    spinnerPPAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                    cardViewHolder.spinner2.setAdapter(spinnerPPAdapter);
                } catch (Exception e) {
                    Log.e("error",e.toString());
                }
            }

            @Override
            public void onnothingSelected(AdapterView<?> parent) {

            }
        });

        cardViewHolder.spinner2.setonItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent,long id) {
               //other operation
            }

            @Override
            public void onnothingSelected(AdapterView<?> parent) {

            }
        });

    }

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


    public static class CardViewHolder extends RecyclerView.ViewHolder {

        public Spinner spinner1;
        public Spinner spinner2;

        public CardViewHolder(View v) {
            super(v);
            spinner1 = (Spinner) v.findViewById(R.id.spinner1);
            spinner2 = (Spinner) v.findViewById(R.id.spinner2);

        }
    }
}

我的微调器 cardViewHolder.spinner1.setonItemSelectedListener 方法只调用屏幕上可见的项目，但我想绑定所有数据，即使它不可见。

解决方法

我认为您需要在 ViewHolder 中实现所有内容。让我给你举个例子：

 @Override
    public void onBindViewHolder(@NonNull SomeHolder holder,int position) {
        if (SomeDataList.size() > 0) {
            SomeData data = SomeDataList.get(position);
            holder.bindData(data);
        }
    }

然后在持有者类中：

public class SomeHolder extends RecyclerView.ViewHolder
        implements View.OnClickListener {

    private final TextView tvAddress;
    private final TextView tvAccountNumber;
    private final TextView tvName;

    private SomeData someData;

    public SomeHolder(@NonNull View itemView) {
        super(itemView);
        tvAccountNumber = itemView.findViewById(R.id.item_point_account_number);
        tvName = itemView.findViewById(R.id.item_point_subscr_name);
        tvAddress = itemView.findViewById(R.id.item_point_address);
       
        itemView.setOnClickListener(this);
    }

    public void bindData(SomeData data) {
        someData = data;
        tvAddress.setText(data.getAddress());
        //other stuff
    }

    @Override
    public void onClick(View v) {
        if (someData!=null){
           tvName.setText(someData.getName());
            //code for click event
        }
    }
}

,

直接在 onBindViewHolder 内，您只为 spinner1 设置了一个适配器，而为 spinner2 没有设置 - 它仅在 onItemSelected 调用 spinner1 后才获得它的适配器

如果你想为 spinner2 设置一些初始值，你必须在 onBindViewHolder 内启动它的适配器，而不仅仅是在 onItemSelected

将您的适配器启动代码移至分离方法

public void setUpSpinner2(Spinner spinner,Products pp) {
    try {
        ArrayAdapter<Orders> spinnerPPAdapter = new ArrayAdapter<Orders>(getContext(),R.layout.pc_estimator_dropdown_item,pp.getOrders());
        spinnerPPAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinner.setAdapter(spinnerPPAdapter);
    } catch (Exception e) {
        Log.e("error",e.toString());
    }
}

然后在 onItemSelected 中调用它

public void onItemSelected(AdapterView<?> parent,View view,int position,long id) {
    Products pp = (Products) parent.getSelectedItem();
    setUpSpinner2(cardViewHolder.spinner2,pp);
}

并且还直接在 setUpSpinner2 内调用 onBindViewHolder 并带有 null 检查（是否在开始时选择了项目）

if (spinnerUserAdapter.getSelectedItem() != null) {
    Products pp = (Products) spinnerUserAdapter.getSelectedItem();
    setUpSpinner2(cardViewHolder.spinner2,pp);
}

---

顺便说一句。我看到您没有将 spinner1 选定的值存储在任何地方，因此回收后两个微调器将再次为空。所以在 onItemSelected 中获取所选项目的位置（有方法 getSelectedItemPosition）并将其存储在某个数组中

//top of adapters code
private ArrayList<MainDetails> mMainDetails;
private Context mContext;
private SparseArray<Integer> selectedItemsForPositions = new SparseArray<>();

在 onItemSelected 和 onNothingSelected 内使用此行放置/清除选定的值（不要混合 onBindViewHolder 和 onItemSelected 的位置，以不同的方式命名）

selectedItemsForPositions.put(onBindViewHolderPosition,parent.getSelectedItemPosition());
// or put null if nothing selected

当你有这个保持选定位置的数组时，然后在 spinner1 适配器设置后恢复这个位置

cardViewHolder.spinner1.setAdapter(spinnerUserAdapter);
Integer selectedPosition = selectedItemsForPositions.get(onBindViewHolderPosition);
if(selectedPosition != null) spinnerUserAdapter.setSelection(selectedPosition);