Cardview et recyclerview

Bonjour à tous,

je suis un novice en développement android (je code avec Android Studio). Mon problème est que je veux afficher des information qui se trouve au niveau de Firebase grâce à cardview et recyclerview.

quand je test sur AVD sa passe bien, mais sur mon smartphone réel les information peuvent mettre des heures avant de s'afficher. souvent rien ne s'affiche.

bon les images expliquent mieux ce que je veux dire

sur l'emulateur tout est au top



sur le telephone rien ne s'affiche je dois patienter des heures souvent avant que tout sois ok, souvent rien ne s'affiche jamais.

mon code

activity_homepage.xml

<ScrollView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".Homepage">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    <include layout="@layout/toolbar_activity"/>

        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/recycler"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_marginTop="65dp"/>
    </RelativeLayout>


</ScrollView>

Homepage.java

package com.ci.phonemarket;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import io.paperdb.Paper;

import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;

import com.ci.phonemarket.Modele.Product;
import com.ci.phonemarket.ViewHolder.ProductViewHolder;
import com.firebase.ui.database.FirebaseRecyclerAdapter;
import com.firebase.ui.database.FirebaseRecyclerOptions;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;

public class Homepage extends AppCompatActivity {

    private DatabaseReference ProductRef;
    private RecyclerView recyclerView;
    RecyclerView.LayoutManager layoutManager;
    FirebaseRecyclerAdapter<Product, ProductViewHolder> adapter;

    Toolbar toolbar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_homepage);
        toolbar = (Toolbar) findViewById(R.id.toolbar2);
        setSupportActionBar(toolbar);

        ProductRef = FirebaseDatabase.getInstance().getReference().child("Produits");
        recyclerView = (RecyclerView) findViewById(R.id.recycler);
        recyclerView.setHasFixedSize(true);
        layoutManager = new LinearLayoutManager(this);
        recyclerView.setLayoutManager(layoutManager);

        showList();

    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();

        if (id == R.id.deconnextion){
            Intent intent = new Intent(Homepage.this, MainActivity.class);
            startActivity(intent);
            finish();
            Paper.book().destroy();
        }
        return super.onOptionsItemSelected(item);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu_toolbar, menu);
        return super.onCreateOptionsMenu(menu);
    }




private void showList(){
    FirebaseRecyclerOptions options =
    new FirebaseRecyclerOptions.Builder<Product>()
            .setQuery(ProductRef, Product.class)
            .build();


    adapter = new FirebaseRecyclerAdapter<Product, ProductViewHolder>(options) {
        @Override
        protected void onBindViewHolder(@NonNull ProductViewHolder productViewHolder, int position, @NonNull Product product) {
            productViewHolder.txtproductName.setText(product.getNom());
            productViewHolder.txtQuantity.setText(product.getQuantite() + "Kg");
            productViewHolder.txtProductDescription.setText(product.getDescription());
        }

        @NonNull
        @Override
        public ProductViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
            View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.products_items_layout, viewGroup,false);
            return new ProductViewHolder(view);
        }
    };
    adapter.startListening();
    adapter.notifyDataSetChanged();
    recyclerView.setAdapter(adapter);
}
}

products_item_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="20dp"
    android:layout_marginStart="15dp"
    android:layout_marginEnd="15dp"
    app:cardElevation="15dp">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <TextView
            android:id="@+id/product_name"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Nom du produit"
            android:textAlignment="center"
            android:textSize="20dp"
            android:textStyle="bold"
            android:textColor="@color/colorPrimaryDark"/>

        <ImageView
            android:id="@+id/product_image"
            android:layout_width="match_parent"
            android:layout_height="200dp"
            android:layout_below="@+id/product_name"
            android:scaleType="center"
            android:layout_marginTop="2dp"/>

        <LinearLayout
            android:id="@+id/quantite_layout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:layout_below="@+id/product_image">
            <TextView

                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="quantité disponible"
                android:layout_marginTop="4dp"

                android:textSize="15dp"
                android:textStyle="bold"
                android:textColor="@color/rouge"/>
            <TextView
                android:id="@+id/product_quantity"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="4dp"
                android:layout_marginLeft="5dp"
                android:textStyle="bold"
                android:text="nombre"/>

        </LinearLayout>

        <TextView
            android:id="@+id/product_description"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_below="@id/quantite_layout"
            android:text="Description du produit"
            android:textAlignment="center"
            android:textSize="20dp"
            android:textColor="@color/colorPrimary"/>

    </RelativeLayout>



</androidx.cardview.widget.CardView>

Product.java

package com.ci.phonemarket.Modele;

public class Product {

    private String quantite, nom_planteur, nom, description, dates, heures;

    public Product(){

    }

    public Product(String quantite, String nom_planteur, String nom, String description, String dates, String heures) {
        this.quantite = quantite;
        this.nom_planteur = nom_planteur;
        this.nom = nom;
        this.description = description;
        this.dates = dates;
        this.heures = heures;
    }


    public String getQuantite() {
        return quantite;
    }

    public void setQuantite(String quantite) {
        this.quantite = quantite;
    }

    public String getNom_planteur() {
        return nom_planteur;
    }

    public void setNom_planteur(String nom_planteur) {
        this.nom_planteur = nom_planteur;
    }

    public String getNom() {
        return nom;
    }

    public void setNom(String nom) {
        this.nom = nom;
    }


    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public String getDates() {
        return dates;
    }

    public void setDates(String dates) {
        this.dates = dates;
    }

    public String getHeures() {
        return heures;
    }

    public void setHeures(String heures) {
        this.heures = heures;
    }
}

ProductViewHolder.java

package com.ci.phonemarket.ViewHolder;

import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;

import com.ci.phonemarket.Interface.itemClickListener;
import com.ci.phonemarket.R;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

public class ProductViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {

    public TextView txtproductName, txtProductDescription, txtQuantity;
    public ImageView imageView;
    public itemClickListener listener;


    public ProductViewHolder(@NonNull View itemView) {
        super(itemView);

        imageView = (ImageView) itemView.findViewById(R.id.product_image);
        txtproductName = (TextView) itemView.findViewById(R.id.product_name);
        txtProductDescription = (TextView) itemView.findViewById(R.id.product_description);
        txtQuantity = (TextView) itemView.findViewById(R.id.product_quantity);
    }

    public void setitemClickListener(itemClickListener listener){
        this.listener = listener;
    }

    @Override
    public void onClick(View view) {
        listener.onClick(view, getAdapterPosition(), false );
    }
}

Merci