使用FirebaseListAdapter填充Listview时出现问题

Question

嗨，我想用FirebaseAdaper填充Listview。数据正确填充，但是我在顶部看到一些空列。所有记录均从第三列写入。我想我从Firebase控制台实时数据库中手动删除了两条记录后开始看到这种情况。第二个问题是我也试图使用“ position”变量显示记录总数，但是它不起作用。这是我的代码：

ListView lv;
static int totalRecords;

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

    totalRecords = 0;

    final FirebaseListAdapter <Profile>adapter;

v = findViewById(R.id.listview);
lv.setAdapter(null);

String sPath = "/Customer/" ;
sPath = sPath.replaceAll("\\s", "");
if( database != null) {
        DatabaseReference myRef = database.getReference(sPath);
        Query query = myRef.orderByChild("/sTimeServiced/");

        if (query != null) {

                    totalRecords = 0;
                    FirebaseListOptions<Profile> options = new FirebaseListOptions.Builder<Profile>()
                                .setQuery(query, Profile.class)
                                .setLayout(android.R.layout.simple_selectable_list_item)
                                .setLifecycleOwner(this)   
                                .build();
                    adapter = new FirebaseListAdapter<Profile>(options){


                             @Override
                                      protected void populateView(View view, Profile p, int position) {
                                           //    totalRecords = totalRecords + 1;
                                 TextView tv = findViewById(R.id.Count);
                                 tv.setText(Integer.toString(position));
                                              ((TextView) view.findViewById(android.R.id.text1)).setText(p.sFN + " " + p.sLN + " (" + p.sTelephone + ")");
                                    }
                                  };
                              lv.setAdapter(adapter);
                              lv.setStackFromBottom(true);