如何将映像从Firestore和存储加载到RecyclerView中？

// 步骤2：添加Firebase依赖库和配置清单文件

// 在build.gradle文件中添加以下依赖库
implementation 'com.google.firebase:firebase-firestore:23.0.3'
implementation 'com.google.firebase:firebase-storage:20.0.0'

// 在应用程序的清单文件中添加以下配置
<application>
    <!-- Firebase配置 -->
    <meta-data
        android:name="com.google.firebase.messaging.default_notification_channel_id"
        android:value="@string/default_notification_channel_id" />
    <meta-data
        android:name="com.google.firebase.messaging.default_notification_icon"
        android:resource="@drawable/ic_notification" />
    <meta-data
        android:name="com.google.firebase.messaging.default_notification_color"
        android:resource="@color/colorPrimary" />
    <meta-data
        android:name="com.google.firebase.messaging.default_notification_channel_name"
        android:value="@string/default_notification_channel_name" />
</application>


// 步骤3：创建数据模型类

public class ImageModel {
    private String imageUrl;
    private String title;

    // 构造函数和Getter/Setter方法

    // ...
}


// 步骤4：初始化Firestore和存储的实例

FirebaseFirestore firestore = FirebaseFirestore.getInstance();
FirebaseStorage storage = FirebaseStorage.getInstance();


// 步骤5：从Firestore中获取映像数据

firestore.collection("images")
        .get()
        .addOnSuccessListener(new OnSuccessListener<QuerySnapshot>() {
            @Override
            public void onSuccess(QuerySnapshot queryDocumentSnapshots) {
                List<ImageModel> imageList = new ArrayList<>();

                for (QueryDocumentSnapshot document : queryDocumentSnapshots) {
                    ImageModel image = document.toObject(ImageModel.class);
                    imageList.add(image);
                }

                // 步骤6：将获取到的映像数据加载到RecyclerView中
                RecyclerView recyclerView = findViewById(R.id.recyclerView);
                ImageAdapter adapter = new ImageAdapter(imageList, storage);
                recyclerView.setAdapter(adapter);
            }
        })
        .addOnFailureListener(new OnFailureListener() {
            @Override
            public void onFailure(@NonNull Exception e) {
                // 处理获取数据失败的情况
            }
        });


// 步骤7：适配器中加载映像数据

public class ImageAdapter extends RecyclerView.Adapter<ImageAdapter.ViewHolder> {
    private List<ImageModel> imageList;
    private FirebaseStorage storage;

    public ImageAdapter(List<ImageModel> imageList, FirebaseStorage storage) {
        this.imageList = imageList;
        this.storage = storage;
    }

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

    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
        ImageModel image = imageList.get(position);

        // 使用FirebaseStorage加载映像
        StorageReference storageRef = storage.getReference();
        StorageReference imageRef = storageRef.child(image.getImageUrl());
        Glide.with(holder.imageView.getContext())
                .load(imageRef)
                .into(holder.imageView);

        holder.titleTextView.setText(image.getTitle());
    }

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

    public class ViewHolder extends RecyclerView.ViewHolder {
        ImageView imageView;
        TextView titleTextView;

        public ViewHolder(@NonNull View itemView) {
            super(itemView);
            imageView = itemView.findViewById(R.id.imageView);
            titleTextView = itemView.findViewById(R.id.titleTextView);
        }
    }
}


// 步骤8：设置适配器给RecyclerView

RecyclerView recyclerView = findViewById(R.id.recyclerView);
ImageAdapter adapter = new ImageAdapter(imageList, storage);
recyclerView.setAdapter(adapter);