我陷入了这个问题，我不知道这是怎么了。我正在尝试使用recyclerview并用firebase实时数据库中的数据填充它。我已经设置了适配器，但问题是onbindviewholder和oncreateviewholder没有被调用。这是密码
工作适配器.java

public class WorkoutAdapter extends RecyclerView.Adapter<WorkoutAdapter.WorkoutViewHolder> {
private List<Workout> workoutList;

public WorkoutAdapter(List<Workout> workoutList) {
    this.workoutList = workoutList;
}

public WorkoutAdapter() {
}

public List<Workout> getWorkoutList() {
    return workoutList;
}

public void setWorkoutList(List<Workout> workoutList) {
    this.workoutList = workoutList;
}

@NonNull
@Override
public WorkoutViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
    Log.i("DEBUG MENU", "onCreateViewHolder");
    LayoutInflater layoutInflater = LayoutInflater.from(parent.getContext());
    ItemWorkoutBinding binding = ItemWorkoutBinding.inflate(layoutInflater, parent, false);
    return new WorkoutViewHolder(binding);
}

@Override
public void onBindViewHolder(@NonNull WorkoutViewHolder holder, int position) {
    Log.i("DEBUG MENU", "onBindViewHolder");
    Workout workout = workoutList.get(position);
    holder.bind(workout);
}

@Override
public int getItemCount() {
    return workoutList.size();
}

class WorkoutViewHolder extends RecyclerView.ViewHolder {
    private ItemWorkoutBinding binding;

    public WorkoutViewHolder(ItemWorkoutBinding binding) {
        super(binding.getRoot());
        this.binding = binding;
    }

    public void bind(Workout workout) {
        binding.setWorkout(workout);
        binding.executePendingBindings();
    }
}

工作片段.java

public class WorkoutPlanFragment extends Fragment {

private WorkoutPlanViewModel mViewModel;
private WorkoutPlanFragmentBinding binding;
private DatabaseReference mDatabase;
Plan plan;
List<Workout> workoutList;

@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    mDatabase = FirebaseDatabase.getInstance().getReference();
}

@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container,
                         @Nullable Bundle savedInstanceState) {
    WorkoutPlanViewModelFactory workoutPlanViewModelFactory = new WorkoutPlanViewModelFactory(workoutList);
    mViewModel = new ViewModelProvider(this, workoutPlanViewModelFactory).get(WorkoutPlanViewModel.class);
    binding = DataBindingUtil.inflate(inflater, R.layout.workout_plan_fragment, container, false);
    binding.setViewmodel(mViewModel);
    View view = binding.getRoot();
    assert getArguments() != null;
    plan = WorkoutPlanFragmentArgs.fromBundle(getArguments()).getPlan();
    ((AppCompatActivity) getActivity()).getSupportActionBar().setTitle(plan.getPlan_name());
    Glide.with(binding.getRoot().getContext()).load(plan.getUri()).into(binding.imageView2);
    return view;
}

@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);
    binding.setPlan(plan);
    setupRvWorkout();
}

public void setupRvWorkout() {
    RecyclerView recyclerView = binding.workoutRV;
    LinearLayoutManager layoutManager = new LinearLayoutManager(getContext(), LinearLayoutManager.VERTICAL, false);
    recyclerView.setLayoutManager(layoutManager);
    mDatabase.child("exercise_workout").child("data").orderByChild("plan_id").equalTo(plan.getPlan_key()).addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
            workoutList = new ArrayList<>();
            for (DataSnapshot snapshot : dataSnapshot.getChildren()) {
                String workout_id = snapshot.child("workout_id").getValue(String.class);
                mDatabase.child("workout").child(workout_id).addListenerForSingleValueEvent(new ValueEventListener() {
                    @Override
                    public void onDataChange(@NonNull DataSnapshot snapshot) {
                        Workout workout = snapshot.getValue(Workout.class);
                        workout.setWorkout_id(workout_id);
                        Log.d("GET", "workout_name: " + workout.getWorkout_name() + " " + workout.getWorkout_id());
                        workoutList.add(workout);
                    }

                    @Override
                    public void onCancelled(@NonNull DatabaseError error) {

                    }
                });
            }
            WorkoutAdapter adapter = new WorkoutAdapter();
            recyclerView.setAdapter(adapter);
            adapter.setWorkoutList(workoutList);
            adapter.notifyDataSetChanged();
        }

        @Override
        public void onCancelled(@NonNull DatabaseError error) {

        }
    });

}

就这些了，提前谢谢你！
编辑：来自firebase的数据被添加到工作列表中，下面是证据：
添加到列表的数据
运动计划集合
运动系列
训练系列
项目\u workout.xml

<layout 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">

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

        <TextView
            android:id="@+id/txt_workout"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="8dp"
            android:layout_marginTop="8dp"
            android:layout_marginBottom="8dp"
            android:fontFamily="@font/roboto_medium"
            android:text="@{workout.workout_name}"
            android:textSize="24sp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.0"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintVertical_bias="0.0" />
    </androidx.constraintlayout.widget.ConstraintLayout>

    <data>

        <variable
            name="workout"
            type="com.example.zahfitclient.model.Workout" />
    </data>
</layout>

训练计划碎片.xml

<layout 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">

    <androidx.constraintlayout.widget.ConstraintLayout
        android:id="@+id/frameLayout2"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".ui.workoutplan.WorkoutPlanFragment">

        <ImageView
            android:id="@+id/imageView2"
            android:layout_width="0dp"
            android:layout_height="180dp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            tools:src="@tools:sample/avatars" />

        <TextView
            android:id="@+id/txt_plannameWO"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="8dp"
            android:fontFamily="@font/roboto_slab_bold"
            android:text="@{plan.plan_name}"
            android:textSize="24sp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/imageView2" />

        <TextView
            android:id="@+id/txt_planlevelWO"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="8dp"
            android:layout_marginEnd="16dp"
            android:fontFamily="@font/roboto_medium"
            android:text="@{plan.level_name}"
            android:textColor="?android:attr/textColorSecondary"
            app:layout_constraintEnd_toStartOf="@+id/view"
            app:layout_constraintHorizontal_bias="1.0"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/txt_plannameWO" />

        <TextView
            android:id="@+id/txt_plantypeWO"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="16dp"
            android:layout_marginTop="8dp"
            android:fontFamily="@font/roboto_medium"
            android:text="@{plan.type_name}"
            android:textColor="?android:attr/textColorSecondary"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.0"
            app:layout_constraintStart_toEndOf="@+id/view"
            app:layout_constraintTop_toBottomOf="@+id/txt_plannameWO" />

        <View
            android:id="@+id/view"
            android:layout_width="2dp"
            android:layout_height="20dp"
            android:layout_marginStart="204dp"
            android:layout_marginTop="8dp"
            android:layout_marginEnd="204dp"
            android:background="@color/black"
            android:backgroundTint="@color/material_on_surface_emphasis_medium"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/txt_plannameWO" />

        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/workoutRV"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:layout_marginTop="8dp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/view" />

    </androidx.constraintlayout.widget.ConstraintLayout>

    <data>

        <variable
            name="plan"
            type="com.example.zahfitclient.model.Plan" />

        <variable
            name="viewmodel"
            type="com.example.zahfitclient.ui.workoutplan.WorkoutPlanViewModel" />
    </data>
</layout>