并非ListView中的所有项目都显示为Android

Question

我正在开发一个应用程序，其中我在ListView中有某些项目。问题是并非所有项目都在显示。即使列表滚动，其中两个也会丢失。

这些项是从firebase收集的，因此代码位于ValueEventListener中。

这是我的片段，其中显示了列表：

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="kandidat.trainingapp.Fragments.FavoritesFragment">

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <ListView
            android:id="@+id/favorite_list"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:divider="@color/colorPrimary"
            android:dividerHeight="3dp" />
    </LinearLayout>


</FrameLayout>

将项目添加到适配器的代码：

 FirebaseDatabase db = FirebaseDatabase.getInstance();
    final FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
    DatabaseReference ref = db.getReference("favorites");
    DatabaseReference myRef = ref.child(user.getUid());

    DatabaseReference pointRef = db.getReference("users").child(user.getUid()).child("points");

    // Inflate the layout for this fragment
    rootView = inflater.inflate(R.layout.fragment_favorites, container, false);
    listView = (ListView) rootView.findViewById(R.id.favorite_list);

    LayoutInflater inflateheader = getLayoutInflater();
    ViewGroup header = (ViewGroup)inflateheader.inflate(R.layout.layout_favorites_header, listView,false);


    listView.addHeaderView(header);

    ArrayList<FavoriteModel> allFavoriteItems = new ArrayList<>();

        myRef.orderByChild("favorites").addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {



                String busStops = "Walked bus stops";
                Set<FavoriteModel> bus = new TreeSet<>();
                String stairs = "Walked flight of stairs";
                Set<FavoriteModel> stairsList = new TreeSet<>();
                String stand = "Minutes standing up";
                Set<FavoriteModel> standList = new TreeSet<>();

                for (DataSnapshot ds : dataSnapshot.child("BusStop").getChildren()) {
                    Integer dsVal = (int) (long) ds.getValue();
                    bus.add(new FavoriteModel(busStops, dsVal));

                }
                for (DataSnapshot ds : dataSnapshot.child("Stairs").getChildren()) {
                    Integer dsVal = (int) (long) ds.getValue();
                    stairsList.add(new FavoriteModel(stairs, dsVal));

                }
                for (DataSnapshot ds : dataSnapshot.child("standing").getChildren()) {
                    Integer dsVal = (int) (long) ds.getValue();
                    standList.add(new FavoriteModel(stand, dsVal));

                }

                allFavoriteItems.clear();
                allFavoriteItems.addAll(bus);
                allFavoriteItems.addAll(stairsList);
                allFavoriteItems.addAll(standList);




                FavoriteAdapter mAdapter = new FavoriteAdapter(context,
                        R.layout.layout_favorite_row, R.id.activity_text, allFavoriteItems);
                if(allFavoriteItems.isEmpty()){
                    if(isAdded()) {
                        emptyText = (TextView) header.findViewById(R.id.empty_favorites);
                        emptyText.setText(getString(R.string.empty_favorites_string));
                    }
                }else{
                    if(isAdded()) {
                        emptyText = (TextView) header.findViewById(R.id.empty_favorites);
                        emptyText.setText(getString(R.string.explain_favorites));
                    }

                }



                listView.setAdapter(mAdapter);






            }

我希望有人知道什么是错的。如果需要更多信息或代码，请告诉我。