图像未从Firebase存储中加载

Question

我正在使用Firebase Storage的新方法listAll();列出存储中所有图像到我的应用程序，但是这些图像未加载到我的应用程序中，并显示空白屏幕。我不知道是什么原因导致此错误。

我的活动分类：

public class Events_and_Participations extends AppCompatActivity {

    StorageReference reference;
    RecyclerView recyclerView;
    Images_Adapter adapter;
    List<Task<Uri>> items = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_events_and_participations);
        Objects.requireNonNull(getSupportActionBar()).setTitle(R.string.item_title_4);

        reference = FirebaseStorage.getInstance().getReference("Events & Participations");

        reference.listAll()
                .addOnSuccessListener(this, listResult -> {

                    for (StorageReference item : listResult.getItems()) {
                        items.add(item.getDownloadUrl());
                    }
                })
                .addOnFailureListener(e -> Toast.makeText(this, e.getMessage(), Toast.LENGTH_SHORT).show());

        adapter = new Images_Adapter(items);
        recyclerView = findViewById(R.id.events_photos);
        recyclerView.setAdapter(adapter);
        recyclerView.setHasFixedSize(true);
        recyclerView.setLayoutManager(new GridLayoutManager(this, 3));
        recyclerView.setItemAnimator(new DefaultItemAnimator());
    }
}

我的图像适配器类：

public class Images_Adapter extends RecyclerView.Adapter<Images_Adapter.Images_VH> {

    private List<Task<Uri>> items;

    Images_Adapter(List<Task<Uri>> items) {
        this.items = items;
    }

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

    @Override
    public void onBindViewHolder(@NonNull Images_VH holder, int position) {
        Task<Uri> item = items.get(position);
        Picasso.get()
                .load(item.getResult())
                .resize(250,250)
                .centerCrop()
                .into(holder.imageView);
    }

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

    static class Images_VH extends RecyclerView.ViewHolder{
        ImageView imageView;

        Images_VH(@NonNull View itemView) {
            super(itemView);

            imageView = itemView.findViewById(R.id.ImageItem);
        }
    }
}

这些是我的Firebase存储规则：

rules_version = '2';
service firebase.storage {
  match /b/sahrudhaya-foundation.appspot.com/o {
    match /{allPaths=**} {
      allow read, write :if request.auth != null;
    }
  }
}

会引发错误类型的“用户无权访问项目”

我完全感到困惑，这是我的第一步。希望对此有所帮助。

Answer 1

尝试替换request.auth!=null with auth！= null`。看看是否可行。