Firebase：存储多个图像 URL 的最佳方式

Question

Just a quick message to ask you about how to store images URLs in Firebase Database for later use. Let me explain:

I use Firebase Storage to store Images but store their respective URLs in Firebase Database, separately from Firebase Storage (as I have been reading on here it was the way to do it).
So in Firebase Database I have a "ItemPictures" Node where I want to store up to 5 pictures URLs per Item.

But I don't know what is the best way to store multiple image URLs of a same Item:
- Creating a List with random ids using push() (and then having to manage deleting manually the picture'sURL when it gets updated).
- Creating a "Picture" Object with 5 URLs String values, making it easier to locate and navigate through.

The thing is that later on I will need those URLs to populate a View Pager with the 5 pictures.

Cheers,

Andy

Answer 1

using an ArrayList will be a better one

ArrayList<String> images = new ArrayList<>();
                images.add("img1url");
                images.add("img2url");
                images.add("img3url");
                images.add("img4url");
                images.add("img5url");

Answer 2

The simplest way is to store each image object with unique key and inside it have five keys with values 1,2,3,4,5 respectively. Then you can easily fetch the desired URL for particular image with ID by :

 firebaseSnapshot.val().ID.1; firebaseSnapshot.val().ID.2; firebaseSnapshot.val().ID.3; firebaseSnapshot.val().ID.4; firebaseSnapshot.val().ID.5;

To further improve the performance you can index the image IDs as they are going to grow larger in number. This has been done in the following question.

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