我应该为每个循环系统创建适配器吗？

Question

我正在用于回收器适配器的diffutil，我需要许多回收库进行分类。我应该为每个循环系统创建适配器吗？相同的视图，相同的类型数据，相同的功能，不同的数据btw

Answer 1

如果您检查回收器视图的OnBindViewHolder方法，它具有您的 holder 参数，该参数为您提供了您拥有的不同视图持有人的实例，并因此为回收器视图设置了布局。
例如，在我的情况下，我必须使用单个回收文章适配器来创建实例收入和列表中的费用。

这就是我的OnBindViewHolder外观：

@override
public void onbindViewHolder（@nonnull recyClerview.ViewHolder持有人，int位置）{

    DialogDetails d=new DialogDetails();

    if (holder instanceof IncomeListHolder){
        ((IncomeListHolder)holder).categoryText.setText(expensesList.get(position).getCategory());
        ((IncomeListHolder)holder).incomeText.setText("+"+expensesList.get(position).getAmount());
        ((IncomeListHolder)holder).incomeText.setTextColor(context.getResources().getColor(R.color.income_color));


    }

    if (holder instanceof ExpensesListHolder){
        ((ExpensesListHolder) holder).category.setText(list.get(position-expensesList.size()).getCategory());
        ((ExpensesListHolder) holder).expenseText.setText("-"+list.get(position- expensesList.size()).getExpense());
        ((ExpensesListHolder) holder).expenseText.setTextColor(context.getResources().getColor(R.color.expense_color));
    }







    //.setText(String.valueOf(balanceList.get(position).getIncome()));


}

您还必须为您希望显示的所有列表数据创建单独的视图持有人，例如：

  public class IncomeListHolder extends RecyclerView.ViewHolder {
        TextView categoryText;
        TextView incomeText;

    public IncomeListHolder(@NonNull View itemView) {
        super(itemView);

        categoryText=itemView.findViewById(R.id.main_category_text_view);
        incomeText=itemView.findViewById(R.id.expenses_text_view);

        itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                int position=getAdapterPosition();
               if (listener!=null && position!=RecyclerView.NO_POSITION){
                   listener.getIncomeData(expensesList.get(position),view);
                  details.setUpdate(true);
               }
            }
        });
    }
}

public class ExpensesListHolder extends RecyclerView.ViewHolder{

     TextView category;
     TextView expenseText;
    public ExpensesListHolder(@NonNull View itemView) {
        super(itemView);

        category=itemView.findViewById(R.id.main_category_text_view_2);
        expenseText=itemView.findViewById(R.id.expenses_text_view_2);

        itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                int position=getAdapterPosition();
                if (listener!=null && position!=RecyclerView.NO_POSITION){
                    listener.getExpenseData(list.get(position-expensesList.size()),view);
                    details.setUpdate(true);
                }
            }
        });
    }
}

我的整个回收器视图适配器：

public class IncomeListAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

        final int VIEW_TYPE_INCOME=0;
        final int VIEW_TYPE_EXPENSE=1;
        View view;
        List<DataBaseEntity> expensesList=new ArrayList<>();
        List<ExpenseDataEntity> list=new ArrayList<>();
        Context context;
        OnItemClickListener listener;
        DialogDetails details=new DialogDetails();


     public IncomeListAdapter(Context context) {
         this.context = context;
     }
//
//         View v=LayoutInflater.from(context).inflate(R.layout.fragment_expense_home,null);
////          t=v.findViewById(R.id.income_text_view);
//     }


    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

         if (viewType==VIEW_TYPE_INCOME) {
             view = LayoutInflater.from(parent.getContext()).inflate(R.layout.expenses_list, parent, false);
             return new IncomeListHolder(view);
         }

         if (viewType==VIEW_TYPE_EXPENSE){
             view=LayoutInflater.from(parent.getContext()).inflate(R.layout.expense_layout_list,parent,false);
             return new ExpensesListHolder(view);
         }



        return null;
    }

    public interface OnItemClickListener{
        void getIncomeData(DataBaseEntity dataBaseEntity,View view);
        void getExpenseData(ExpenseDataEntity expenseDataEntity,View view);

    }

    public void setOnItemClickListener(OnItemClickListener listener){
         this.listener=listener;
    }






    @Override
    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {

        DialogDetails d=new DialogDetails();

        if (holder instanceof IncomeListHolder){
            ((IncomeListHolder)holder).categoryText.setText(expensesList.get(position).getCategory());
            ((IncomeListHolder)holder).incomeText.setText("+"+expensesList.get(position).getAmount());
            ((IncomeListHolder)holder).incomeText.setTextColor(context.getResources().getColor(R.color.income_color));


        }

        if (holder instanceof ExpensesListHolder){
            ((ExpensesListHolder) holder).category.setText(list.get(position-expensesList.size()).getCategory());
            ((ExpensesListHolder) holder).expenseText.setText("-"+list.get(position- expensesList.size()).getExpense());
            ((ExpensesListHolder) holder).expenseText.setTextColor(context.getResources().getColor(R.color.expense_color));
        }







        //.setText(String.valueOf(balanceList.get(position).getIncome()));


    }

    public DataBaseEntity getDataAt(int position){
         return expensesList.get(position);
    }

    public ExpenseDataEntity getExpenseAt(int position){
         return list.get(position- expensesList.size());
    }

    @Override
    public int getItemCount() {
        return expensesList.size()+list.size();
    }

    @Override
    public int getItemViewType(int position) {


        if (position< expensesList.size()){
            return VIEW_TYPE_INCOME;
        }

        if (position-expensesList.size()< list.size()){
            return VIEW_TYPE_EXPENSE;
        }

        return -1;
    }

    public void setExpensesList(List<DataBaseEntity> expensesList){
        this.expensesList=expensesList;
        notifyDataSetChanged();
    }

    public void setList(List<ExpenseDataEntity> list){
         this.list=list;
         notifyDataSetChanged();
    }
//    public void setBalanceList(List<BalanceSheetEntity> balanceList){
//        this.balanceList=balanceList;
//        notifyDataSetChanged();
//    }

    public class IncomeListHolder extends RecyclerView.ViewHolder {
            TextView categoryText;
            TextView incomeText;

        public IncomeListHolder(@NonNull View itemView) {
            super(itemView);

            categoryText=itemView.findViewById(R.id.main_category_text_view);
            incomeText=itemView.findViewById(R.id.expenses_text_view);

            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    int position=getAdapterPosition();
                   if (listener!=null && position!=RecyclerView.NO_POSITION){
                       listener.getIncomeData(expensesList.get(position),view);
                      details.setUpdate(true);
                   }
                }
            });
        }
    }

    public class ExpensesListHolder extends RecyclerView.ViewHolder{

         TextView category;
         TextView expenseText;
        public ExpensesListHolder(@NonNull View itemView) {
            super(itemView);

            category=itemView.findViewById(R.id.main_category_text_view_2);
            expenseText=itemView.findViewById(R.id.expenses_text_view_2);

            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    int position=getAdapterPosition();
                    if (listener!=null && position!=RecyclerView.NO_POSITION){
                        listener.getExpenseData(list.get(position-expensesList.size()),view);
                        details.setUpdate(true);
                    }
                }
            });
        }
    }


}