在适配器中，我想获取所选用户的用户ID。但是它显示了一个错误

getRef（位置）

当得到一个key.how来解决这个问题？这是我的OnBindViewHolder，

@Override
    public void onBindViewHolder(final RecyclerView.ViewHolder holder, int position) {
        final MyHolder myHolder = (MyHolder) holder;
        final Users current = data.get(position);

        mUsersDatabase = FirebaseDatabase.getInstance().getReference("Users");

        myHolder.name.setText(current.getName());
        myHolder.status.setText(current.getStatus());
        Picasso.get().load(current.getImage()).placeholder(R.drawable.download).into(myHolder.img);

        final String user_id = getRef(position).getKey();

        View.OnClickListener profileView = new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Intent profile_intent = new Intent(mContext,ProfileActivity.class);
                profile_intent.putExtra("user_id",user_id);
                mContext.startActivity(profile_intent);

            }
        };

        myHolder.itemView.setOnClickListener(profileView);
    }

我想获取所选用户的详细信息。

这是我的个人资料活动；

 @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_profile);

        String user_id = getIntent().getStringExtra("user_id");

        mUsersDatabase = FirebaseDatabase.getInstance().getReference().child("Users").child(user_id);

        mProfileImage = (ImageView) findViewById(R.id.profile_image);
        mProfileName = (TextView) findViewById(R.id.profile_display_name);
        mProfileStatus = (TextView) findViewById(R.id.profile_status);
        mProfileFirendsCount = (TextView) findViewById(R.id.profile_total_friends);
        mSendRequestBtn = (Button) findViewById(R.id.request_btn);

        mUsersDatabase.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {

                String display_name = dataSnapshot.child("name").getValue().toString();
                String status = dataSnapshot.child("status").getValue().toString();
                String image = dataSnapshot.child("image").getValue().toString();

                mProfileName.setText(display_name);
                mProfileStatus.setText(status);
            }