java - 执行过滤: List<>

Question

我只想从列表中执行过滤搜索，但我只有 ArrayList 源代码。使用List而不是ArrayList时如何转换？

下面是我的代码:

 @Override
    protected FilterResults performFiltering(CharSequence constraint) {
        FilterResults results = new FilterResults();

        //CHECK CONSTRAINT VALIDITY
         if(constraint != null && constraint.length() > 0)
         {
             //CHANGE TO UPPER
             constraint = constraint.toString().toUpperCase();
             //STORE OUR FILTERED ORDER
             ArrayList<OrderModel> filteredOrder = new ArrayList<>();

             for (int i=0; i<filteredOrder.size(); i++) {
                 // CHECK
                 if (filterList.get(i).getCustomerName().toUpperCase().contains(constraint)) {
                     //ADD CUSTOMER TO FILTERED ORDERS
                    filteredOrder.add(filterList.get(i));
                    Log.d("Testing.....","You are here --->" + filteredOrder);
                 }
             }
             results.count = filteredOrder.size();
             results.values = filteredOrder;
         } else {
             results.count = filterList.size();
             results.values = filterList;
         }
        return results;
    }

Answer 1

如果你替换你的代码应该没问题

ArrayList<OrderModel> filteredOrder = new ArrayList<>();

与

List<OrderModel> filteredOrder = new ArrayList<>();

但要小心，在导入中你必须有

import java.util.List;

当您只使用 add() 和 size() 时，它必须起作用。