有多种图像类型时，将图像从Firestore加载到RecyclerView中 [英] Loading images from Firestore into a RecyclerView when there are multiple image types

问题描述

我有一个RecyclerView，它使用GridLayoutManager，并且每个单元格都包含一个ImageView.我想用来填充的数据以.png和.jpeg图像的形式存储在Firestore存储中，每个图像的命名为 icon#.png 或 icon#.jpeg 其中#是相应单元格的位置.我的问题是，当我尝试按照下面所示的方式将每个图像加载到各自单元格的imageView中时，收到一条错误消息，因为由于某些扩展名为.png而另一些具有.png扩展名，因此我无法检索到所有图像.jpeg一个.据我了解，我需要先将文件扩展名传递到 storageReference.child()方法中，然后才能从Firestore加载任何图像，对吗?那么我如何在这里实现我的目标?

I have a RecyclerView which uses a GridLayoutManager and each cell consists of a single ImageView. The data that i want to use to populate it are stored in my Firestore storage as .png and .jpeg images and the naming of each one is icon#.png or icon#.jpeg where # is the respective cell's position. My issue is that when i try to load each image into the respective cell's imageView with the way that you see below, i get an error message because i can't retrieve every image due to some having a .png extension while others have a .jpeg one. It's my understanding that i need to pass the file extension into the storageReference.child() method before i can load any image from Firestore, correct? So how can i achieve my goal here?

onBindViewHolder():

onBindViewHolder() :

@Override
public void onBindViewHolder(@NonNull final ViewHolder holder, int position) {

    storageReference.child("Icons/icon"+position+".png").getDownloadUrl()
            .addOnSuccessListener(new OnSuccessListener<Uri>() {
                @Override
                public void onSuccess(Uri uri) {
                    GlideApp.with(mContext).load(uri).into(holder.iconImgView);
                    Log.d("Adapter", "Image loaded successfully");
                }
            })
            .addOnFailureListener(new OnFailureListener() {
                @Override
                public void onFailure(@NonNull Exception e) {
                    Log.d("Adapter", "ERROR DOWNLOADING IMAGE");
                }
            });
}

推荐答案

不是最聪明的方法，但更简单的方法是在 onFailure 方法中获取* .png，并为*运行相同的提取.jpeg.而且只有在处理错误之后.

Not the smartest one but the easier method is to in onFailure method for fetching of*.png run the same fetch for *.jpeg. And only after that handle error.

以防万一，您在Firestore中没有类似'exist(name)'的方法(可能是我不熟悉)

This is in case you don't have something like 'exist(name)' method in Firestore (simply I'm not familiar with it)

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