Android-Firebase将数据检索到listview但不可查看

我已经完成了对我的数据库的添加并创建了一个列表视图来检索数据并将其转换为列表视图但它不会出现在我的应用程序中 . 有人会帮我看看我的代码出了什么问题吗？

This is my arrayadapter

public class Foodlist extends ArrayAdapter<Food> {

private Activity context;
private List<Food> foodlists;

public Foodlist(Activity context, List<Food> foodlists){
    super(context, R.layout.list_layout, foodlists);
    this.context = context;
    this.foodlists = foodlists;
}

@NonNull
@Override
public View getView(int position,  View convertView, ViewGroup parent) {
    LayoutInflater inflater = context.getLayoutInflater();

    View listViewItem = inflater.inflate(R.layout.list_layout, null , true);

    TextView textViewName = (TextView) 
    listViewItem.findViewById(R.id.textViewName);
    TextView textViewType = (TextView) 
    listViewItem.findViewById(R.id.textViewType);

    Food food = foodlists.get(position);
    textViewName.setText(food.getFoodName());
    textViewType.setText(food.getFoodType());

    return listViewItem;


  }
}

This is my class file

package com.example.asus.mobilefoodpicker;

public class Food {

private String foodid,foodname, foodtype;

public Food(){

}

public Food(String id, String name, String type) {
    this.foodid = id;
    this.foodname = name;
    this.foodtype = type;
}

public String getFoodId() {
    return foodid;
}

public String getFoodName() {
    return foodname;
}

public String getFoodType() {
    return foodtype;
}
}

This is the activity listview will appear

package com.example.asus.mobilefoodpicker;

import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.text.TextUtils;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Spinner;
import android.widget.Toast;

import com.firebase.client.Firebase;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;

import java.util.ArrayList;
import java.util.List;


public class Addbreakfast extends AppCompatActivity {
private EditText EnterFN;
private Button buttonadd;
Spinner spinnerfoodtype;

DatabaseReference databasemobilefoodpicker;
ListView listViewFood;

List<Food> foodlists;



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

    databasemobilefoodpicker = 
FirebaseDatabase.getInstance().getReference("food");

    EnterFN = (EditText)findViewById(R.id.Efn);
    buttonadd = (Button) findViewById(R.id.sbtn);
    spinnerfoodtype = (Spinner) findViewById(R.id.spinner);
    foodlists = new ArrayList<>();

    listViewFood = (ListView) findViewById(R.id.listViewFood);

    buttonadd.setOnClickListener(new View.OnClickListener(){
        @Override
        public void onClick(View v) {
            addfood();

        }
    });

}

@Override
protected void onStart() {
    super.onStart();
    databasemobilefoodpicker.addValueEventListener(new ValueEventListener() 
{
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {

            foodlists.clear();

            for(DataSnapshot foodSnapshot : dataSnapshot.getChildren()){
                Food food = foodSnapshot.getValue(Food.class);

                foodlists.add(food);
            }

            Foodlist adapter = new Foodlist(Addbreakfast.this, foodlists);
            listViewFood.setAdapter(adapter);
        }

        @Override
        public void onCancelled( DatabaseError databaseError) {

        }
    });
}

private void addfood(){
    String name = EnterFN.getText().toString().trim();
    String foodtype = spinnerfoodtype.getSelectedItem().toString();

    if(!TextUtils.isEmpty(name)){
        String id = databasemobilefoodpicker.push().getKey();

        Food food = new Food(id,name,foodtype);

        databasemobilefoodpicker.child(id).setValue(food);

        Toast.makeText(this,"Food Added", Toast.LENGTH_LONG).show();

    }else{
        Toast.makeText(this, "You should enter a name", 
Toast.LENGTH_LONG).show();
    }
}

}

列表视图将显示数据库中的数据，但文本不可见 .