如何使用`listAll（）`方法获取您的firebase存储项目的数据？

我知道文档显示了如何列出这样的项目：

listRef.listAll()
.addOnSuccessListener(new OnSuccessListener() {
@Override
public void onSuccess(ListResult listResult) {
for (StorageReference prefix : listResult.getPrefixes()) {
// All the prefixes under listRef.
// You may call listAll() recursively on them.
}
for (StorageReference item : listResult.getItems()) {
// All the items under listRef.
}
}
})


...但是如何从item中获取数据？例如，图像uri或元数据。

public class Wallpaper {
private String wallpaperName;
private Uri imageUri;
public Wallpaper(String wallpaperName,Uri imageUri) {
this.wallpaperName = wallpaperName;
this.imageUri = imageUri;
}
public Wallpaper() {
}
public String getWallpaperName() {
return wallpaperName;
}
public void setWallpaperName(String wallpaperName) {
this.wallpaperName = wallpaperName;
}
public Uri getImageUri() {
return imageUri;
}
public void setImageUri(Uri imageUri) {
this.imageUri = imageUri;
}
}
public class ShowWallpapers extends AppCompatactivity {
private RecyclerView recyclerView;
private RecyclerViewAdapter recyclerViewAdapter;
private List wallpaperList;
private StorageReference storageReference;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_show_wallpapers);
storageReference = FirebaseStorage.getInstance().getReference("wallpapers");
recyclerView = findViewById(R.id.recyclerview);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
wallpaperList = new ArrayList<>();
storageReference.listAll()
.addOnSuccessListener(new OnSuccessListener() {
@Override
public void onSuccess(ListResult listResult) {
for (StorageReference item : listResult.getItems()) {
// i want to set-up my Wallpaper object here and add it to my list
// but how can i do that
}
recyclerViewAdapter = new RecyclerViewAdapter(ShowWallpapers.this,wallpaperList);
recyclerView.setadapter(recyclerViewAdapter);
}
}).addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
}
});
}
}


我的存储的控制台视图：https://i.imgur.com/jnjW6Ko.png

StorageReference中有documentation for how to get the download url。您可能还需要总体上回顾StorageReference文档，因为基本上在列出参考文献时您想要做的所有事情都应该在这里：）

在这种情况下，一旦您进入listAll()的成功处理程序，就开始启动任务以从存储参考中获取下载URL（或元数据，使用getMetadata()和类似的方法）。

类似的东西：

storageReference.listAll()
.addOnSuccessListener(new OnSuccessListener() {
@Override
public void onSuccess(ListResult listResult) {
for (StorageReference item : listResult.getItems()) {
item.getDownloadUrl().addOnSuccessListener(new OnSuccessListener() {
@Override
public void onSuccess(Uri uri) {
// Do whatever you need here.
Log.w(TAG,"downloadUrl:" + uri.toString());
}
}).addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception exception) {
// Handle any errors
}
});
}
}
});


当然，以上内容在引用位置（通过getPrefixes()）没有任何前缀，它只是列出了该引用处直接可用的blob。