我尝试从firebase数据库中的回收器视图设置upvote的值，即当用户单击“喜欢”按钮时，upvote的值将递增1，但如果用户再次单击“喜欢”按钮，upvote的值将递减1。为此，我尝试切换和if-else，但由于它保留在set Value（）部分中，因此不起作用。

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

    public static Context context;

    List<String[]> myDataList;
    List<qna_data> mydataList;
    int values ;

    Long number;
    private Long likeCount;
    private Long downlikeCount;
    private boolean isLiked = false;

    private DatabaseReference qnaRef;
    List<DataSnapshot> dataSnapshotList;
    

    public MyRecyclerViewAdapter(List<qna_data> myDataList) {
        this.mydataList = myDataList;
    }

    public MyRecyclerViewAdapter(DatabaseReference qnaRef, List<DataSnapshot> dataSnapshotList) {
        this.qnaRef = qnaRef;
        this.dataSnapshotList = dataSnapshotList;
    }

    // Create new views (invoked by the layout manager)
    @Override
    public MyRecyclerViewAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.recycleview_post_profile, parent, false);
        return new ViewHolder(view);
    }

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

        qna_data data = mydataList.get(position);

        context = holder.itemView.getContext();

        holder.question_asked.setText(data.getQuestion_qna_asked());

        holder.time_of_question.setText(data.getQna_timestamp_asked());
        holder.category_choosen.setText(data.getCategory_qna_asked());
        holder.username.setText(data.getUser_qna_name_asked());
        holder.upvote.setText(String.valueOf(data.getUpvote()));
        holder.downvote.setText(String.valueOf(data.getDownvote()));

        holder.upvote_liner.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                number = data.getUpvote();
                String pushkey = data.getPushkey();
                String scholarid = data.getScholar_id();

                likeCount = number + 1;
                DatabaseReference answersRef = FirebaseDatabase.getInstance().getReference("QnA/Questions").child(pushkey).child(scholarid);

                switch (values) {
                    case 0:
                        System.out.println(values);
                        System.out.println("it is liked");
                        answersRef.child("upvote").setValue(likeCount).addOnCompleteListener(new OnCompleteListener<Void>() {
                            @Override
                            public void onComplete(@NonNull Task<Void> task) {
                                Toast.makeText(view.getContext(), "Toast", Toast.LENGTH_SHORT).show();
                            }
                        });
                        values = 1;

                        System.out.println(values);
                        break;

                    case 1:

                        System.out.println("");
                        Toast.makeText(view.getContext(), "clicked", Toast.LENGTH_SHORT).show();
                        values = 0;
                        break;

                    default:
                        System.out.println("unknown value of isLiked");
                        break;
                }

//                if (isLiked == false) {
//                    System.out.println("isLiked is false");
//                    isLiked = true;
//                    System.out.println("isLiked is now true");
//                    answersRef.child("upvote").setValue(likeCount);
//
//                    return;
//                } else {

//                    System.out.println("isLiked is true");
//                    Toast.makeText(view.getContext(), "Toast", Toast.LENGTH_SHORT).show();
//                }

            }
        });

        Glide.with(holder.profile_of_users.getContext())
                .load(data.getImage()).into(holder.profile_of_users);

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

    // ViewHolder class
    public class ViewHolder extends RecyclerView.ViewHolder {
        public TextView question_asked, time_of_question, category_choosen, username, upvote, downvote;
        de.hdodenhof.circleimageview.CircleImageView profile_of_users;
        LinearLayoutCompat linear, upvote_liner;

        AppCompatImageView upimage;

        public ViewHolder(View itemView) {
            super(itemView);

            linear = itemView.findViewById(R.id.answer_question_qna);

            profile_of_users = itemView.findViewById(R.id.profile_qna);

            profile_of_users = itemView.findViewById(R.id.profile_qna);
            username = itemView.findViewById(R.id.user_name_qna);
            time_of_question = itemView.findViewById(R.id.timestamp_qna);
            category_choosen = itemView.findViewById(R.id.category_qna);
            question_asked = itemView.findViewById(R.id.question_qna);

            upvote = itemView.findViewById(R.id.upvote_waala_qna);
            downvote = itemView.findViewById(R.id.downvote_waala_qna);
            upvote_liner = itemView.findViewById(R.id.upvote_linear);
//            upimage = itemView.findViewById(R.id.upvote_button);
        }

        public qna_data getItem(int position) {
            // Get the question object at this position
            DataSnapshot questionSnapshot = dataSnapshotList.get(position);
            qna_data question = questionSnapshot.getValue(qna_data.class);
            question.setPushkey(questionSnapshot.getKey());
            return question;
        }

    }

}

我在调试后更新了代码，我知道values变量的值更改为1，但情况1：如果使用setValue（）方法，则不运行，但如果不使用setValue（）方法，则运行良好