Android-Java-Firestore在我的项目中没有在Recyclerview中显示数据

我试图从firestore获取数据,但我的代码似乎不起作用。如果代码中有错误,你能告诉我吗?我再也受不了了(

--------------------------------------//ArtistModel

public class ArtistsModel {

public ArtistsModel() {}

String artistName, artistClass;

public  ArtistsModel(String artistName, String artistClass) {
    this.artistName = artistName;
    this.artistClass = artistClass;
}

public String getArtistName() {
    return artistName;
}

public void setArtistName(String artistName) {
    this.artistName = artistName;
}

public String getArtistClass() {
    return artistClass;
}

public void setArtistClass(String artistClass) {
    this.artistClass = artistClass;
}
}

--------------------------------------------------------------------------//ArtistAdapter

       public class ArtistsAdapter extends 
     FirestoreRecyclerAdapter<ArtistsModel, ArtistsAdapter.holder> {


/**
 * Create a new RecyclerView adapter that listens to a Firestore Query.  See {@link
 * FirestoreRecyclerOptions} for configuration options.
 *
 * @param options
 */
public ArtistsAdapter(@NonNull FirestoreRecyclerOptions<ArtistsModel> options) {
    super(options);
}

@Override
protected void onBindViewHolder(@NonNull holder holder, int position, @NonNull ArtistsModel model) {

    holder.artistName.setText(model.getArtistName());
    holder.artistClass.setText(model.getArtistClass());

}

@NonNull
@Override
public holder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
    View view = LayoutInflater.from(parent.getContext())
            .inflate(R.layout.artistrow, parent, false);
    return new holder(view);
}

class holder extends RecyclerView.ViewHolder{

    TextView artistName, artistClass;


    public holder(@NonNull View itemView) {
        super(itemView);
        View view = itemView;

        artistName = view.findViewById(R.id.tvartist_name);
        artistClass = view.findViewById(R.id.tvartist_class);

    }
}

 }

--------------------------------------------------------------------------//主要活动

RecyclerView recView;
FirebaseFirestore fStore;
ArtistsAdapter artistsAdapter;


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

    recView = findViewById(R.id.recyclerView);
    recView.setLayoutManager(new LinearLayoutManager(MainActivity.this));

    fStore = FirebaseFirestore.getInstance();
    Query query = fStore.collection("Artists");

    FirestoreRecyclerOptions<ArtistsModel> options =
            new FirestoreRecyclerOptions.Builder<ArtistsModel>()
                    .setQuery(query, ArtistsModel.class)
                    .build();

    artistsAdapter = new ArtistsAdapter(options);
    recView.setAdapter(artistsAdapter);

    artistsAdapter.startListening();
  
  }
  }

--------------------------------------------------------------------------//艺术家行XML

 <androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
xmlns:app="http://schemas.android.com/apk/res-auto"
app:cardCornerRadius="8dp"
android:layout_marginLeft="16dp"
android:layout_marginRight="16dp"
android:layout_marginTop="8dp"
app:cardBackgroundColor="@color/background_item">

<androidx.cardview.widget.CardView
    android:id="@+id/cdartist_card"
    android:layout_width="wrap_content"
    android:layout_height="70dp"
    app:cardBackgroundColor="@color/background_item"
    app:cardCornerRadius="5dp">

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <TextView
            android:id="@+id/tvartist_name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="16dp"
            android:layout_marginTop="16dp"
            android:fontFamily="@font/ppsemi"
            android:text="Jméno umělce"
            android:textColor="#FFFFFF"
            app:layout_constraintStart_toEndOf="@+id/ivartist_photo"
            app:layout_constraintTop_toTopOf="parent" />

        <ImageView
            android:id="@+id/ivartist_photo"
            android:layout_width="70dp"
            android:layout_height="70dp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintVertical_bias="0.0"
            app:srcCompat="@drawable/profile_template" />

        <TextView
            android:id="@+id/tvartist_class"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:fontFamily="@font/pplight"
            android:text="Zařazení umělce"
            android:textColor="#FFFFFF"
            android:textSize="12sp"
            android:translationY="-5dp"
            app:layout_constraintStart_toStartOf="@+id/tvartist_name"
            app:layout_constraintTop_toBottomOf="@+id/tvartist_name" />

    </androidx.constraintlayout.widget.ConstraintLayout>
</androidx.cardview.widget.CardView>