Question

朋友，我有一个片段，其中包含搜索视图和recyclerview。我想在recyclerview数据上实现该搜索视图。当我尝试从片段中的适配器类中调用方法时，我遇到了问题，它不允许它并要求我将适配器类中的方法设置为静态，这是不好。这是必需的片段代码-

 private void processQuery(String query) {
        // in real app you'd have it instantiated just once
        ArrayList<String> result = new ArrayList<>();

        // case insensitive search
        for (String category : category_name) {
            if (category.toLowerCase().contains(query.toLowerCase())) {
                result.add(category);
            }
        }

        (MyCategoryAdaptercheckbox) MyAdapter.setCategorynames(result);
    }

我在这条线上出现错误-

(MyCategoryAdaptercheckbox) MyAdapter.setCategorynames(result);

这是我的MyAdaper声明和初始化-

RecyclerView.Adapter MyAdapter;
 MyAdapter = new MyCategoryAdaptercheckbox(getMyCategoryAdapter1, getActivity().getApplicationContext(),category_name);

        recyclerView.setAdapter(MyAdapter);

这是我的适配器类（setCategorynames）方法，要求我将此方法设置为静态-

public  void setCategorynames(List<String> category_name) {
        this.category_name = category_name;
        notifyDataSetChanged();
    }

所以我想知道如何在片段中调用适配器类的方法？我的适配器类代码-

public class MyCategoryAdaptercheckbox extends RecyclerView.Adapter<MyCategoryAdaptercheckbox.ViewHolder> {
    List<GetMyCategoryAdapter> getMyCategoryAdapter;
    Context context;
    List<String> category_name;
   GetMyCategoryAdapter getMyCategoryAdapter1;

    public MyCategoryAdaptercheckbox(List<GetMyCategoryAdapter> getMyCategoryAdapter, Context context, List<String> category_name) {
    this.getMyCategoryAdapter = getMyCategoryAdapter;
    this.context = context;
    this.category_name = category_name;
    }
    @Override
    public void onBindViewHolder(@NonNull ViewHolder viewHolder, int i) {
        if (viewHolder instanceof ViewHolder){
        }
        getMyCategoryAdapter1 =  getMyCategoryAdapter.get(i);
      ((ViewHolder) viewHolder).tv_categorytitle.setText(getMyCategoryAdapter1.getC_name());
        ((ViewHolder) viewHolder).tv_categoryid.setText(getMyCategoryAdapter1.getC_id());
        ((ViewHolder) viewHolder).gt= getMyCategoryAdapter1;
    }

    public void filterList(ArrayList<String> filterdNames) {
        this.category_name = filterdNames;
        notifyDataSetChanged();
    }
    }
}

Answer 1

我在您的代码中看到的一个问题是*traser，因为setCategorynames(List<String> category_name) method is not resolved没有转换为MyAdapter

您需要替换

(MyCategoryAdaptercheckbox)

通过

(MyCategoryAdaptercheckbox) MyAdapter.setCategorynames(result);

Answer 2

首先创建一个这样的接口；

public interface ProcessQueryListener{
     void onSuccess(List<String> result);
}

在适配器中，您应该根据需要实现此侦听器。基本上就是这样：

public MyCategoryAdaptercheckbox extends RecyclerView.Adapter implements ProcessQueryListener {
    @Override
    public void onSuccess(List<String> result){
         this.setCategorynames(result);
    }
}
.
.

在片段的processQuery函数中，应调用此ProcessQueryListener。例如；

ProcessQueryListener queryListener = (MyCategoryAdaptercheckbox) MyAdapter;

private void processQuery(String query) {
        // in real app you'd have it instantiated just once
        ArrayList<String> result = new ArrayList<>();

        // case insensitive search
        for (String category : category_name) {
            if (category.toLowerCase().contains(query.toLowerCase())) {
                result.add(category);
            }
        }

        if (queryListener != null) {
           queryListener.onSuccess(result);
        }
}

在片段中调用适配器方法

2 个答案: