public class SearchModel {
    public String make;
    private String model;
    private String stock;
    public SearchModel() {}
    public String getMake() {
        return this.make;
    }
    public void setMake(String make) {
        this.make = make;
    }
    public String getModel() {
        return model;
    }
    public void setModel(String model) {
        this.model = model;
    }
    public String getStock() {
        return stock;
    }
    public void setStock(String stock) {
        this.stock = stock;
    }
}

public class MainActivity extends AppCompatActivity {
    private DatabaseReference databaseReference = FirebaseDatabase.getInstance().getReference().child("users").child("user1");
    private ListView mListView;
    private TextView tv_make;
    private TextView tv_model;
    private TextView tv_stock;
    private ArrayList<String> list = new ArrayList<>();
    private ArrayAdapter<String> adapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        tv_make = (TextView) findViewById(R.id.tv_list_item_make);
        tv_model = (TextView) findViewById(R.id.tv_list_item_model);
        tv_stock = (TextView) findViewById(R.id.tv_list_item_stock);
        databaseReference.addChildEventListener(new ChildEventListener() {
            @Override
            public void onChildAdded(@NonNull DataSnapshot snapshot, @Nullable String previousChildName) {
                String value = snapshot.child("make").getValue(String.class);
                list.add(value);
                mListView = (ListView) findViewById(R.id.lv_searches);
                adapter = new ArrayAdapter<>(getApplicationContext(), android.R.layout.simple_list_item_1, list);
                mListView.setAdapter(adapter);
            }
            @Override
            public void onChildChanged(@NonNull DataSnapshot snapshot, @Nullable String previousChildName) {
            }
            @Override
            public void onChildRemoved(@NonNull DataSnapshot snapshot) {
            }
            @Override
            public void onChildMoved(@NonNull DataSnapshot snapshot, @Nullable String previousChildName) {
            }
            @Override
            public void onCancelled(@NonNull DatabaseError error) {
            }
        });
        FloatingActionButton fab = findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
            }
        });
    }
}

<!-- content.main.xml -->
<ListView
    android:id="@+id/lv_searches"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
</ListView>

<!-- list_item.xml -->
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="100dp"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:padding="10dp">
    <TextView
        android:id="@+id/tv_list_item_make"
        android:layout_width="wrap_content"
        android:layout_height="50dp"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
    <TextView
        android:id="@+id/tv_list_item_model"
        android:layout_width="wrap_content"
        android:layout_height="40dp"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintBottom_toBottomOf="parent" />
    <TextView
        android:id="@+id/tv_list_item_stock"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

public class CustomAdapter extends BaseAdapter {
    private static ArrayList<SearchModel> searchArrayList;
    private LayoutInflater mInflater;
    private Context mContext;
    private int lastPosition;
    /**
     * Holds elements in a view
     */
    static class ViewHolder {
        TextView make;
        TextView model;
        TextView stock;
    }
    public CustomAdapter(Context context, ArrayList<SearchModel> results) {
        searchArrayList = results;
        mContext = context;
        mInflater = LayoutInflater.from(context);
    }
    @Override
    public int getCount() {
        return searchArrayList.size();
    }
    @Override
    public Object getItem(int position) {
        return searchArrayList.get(position);
    }
    @Override
    public long getItemId(int position) {
        return position;
    }
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        String make = searchArrayList.get(position).getMake();
        String model = searchArrayList.get(position).getModel();
        String stock = searchArrayList.get(position).getStock();
        final View result;
        ViewHolder holder;
        if (convertView == null) {
            LayoutInflater inflater = LayoutInflater.from(mContext);
            convertView = inflater.inflate(R.layout.list_item, parent, false);
            holder = new ViewHolder();
            holder.make = (TextView) convertView.findViewById(R.id.tv_list_item_make);
            holder.model = (TextView) convertView.findViewById(R.id.tv_list_item_model);
            holder.stock = (TextView) convertView.findViewById(R.id.tv_list_item_stock);
            result = convertView;
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
            result = convertView;
        }
        Animation animation = AnimationUtils.loadAnimation(mContext,
                (position > lastPosition) ? R.anim.load_down_anim : R.anim.load_up_anim);
        result.startAnimation(animation);
        lastPosition = position;
        holder.make.setText(make);
        holder.model.setText(model);
        holder.stock.setText(stock);
        return convertView;
    }
}

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    databaseReference.addChildEventListener(new ChildEventListener() {
        @Override
        public void onChildAdded(@NonNull DataSnapshot snapshot, @Nullable String previousChildName) {
            String make = snapshot.child("make").getValue(String.class);
            String model = snapshot.child("model").getValue(String.class);
            String stock = snapshot.child("stock").getValue(Long.class).toString();
            SearchModel searchModel = new SearchModel(make, model, stock);
            searchList.add(searchModel);
            CustomAdapter customAdapter = new CustomAdapter(getApplicationContext(), searchList);
            mListView = (ListView) findViewById(R.id.lv_searches);
            mListView.setAdapter(customAdapter);
        }
        @Override
        public void onChildChanged(@NonNull DataSnapshot snapshot, @Nullable String previousChildName) {
        }
        @Override
        public void onChildRemoved(@NonNull DataSnapshot snapshot) {
        }
        @Override
        public void onChildMoved(@NonNull DataSnapshot snapshot, @Nullable String previousChildName) {
        }
        @Override
        public void onCancelled(@NonNull DatabaseError error) {
        }
    });
}