Firebase can't handle single digit numbers in array size

Question

I am adding a model that has an array of top users.

It is an arraylist of objects.

Everything works just fine, but when viewing the table from the top view it shows the table can't handle right the single digit numbers -

though when actually clicking on that table everything is being shown the correct way -

Is it something internal that has to do with Firebase UI or can I fix it somehow?

score 1 · Accepted Answer · answered Sep 09 '19 at 14:55

1

Keys in the Firebase Realtime Database are always interpreted as strings, and are sorted lexicographically. In lexicographical order "2" comes after "19", just like "c" comes before "bz".

To work around this problem, you'll typically want to ensure all keys are the same length. When you do that "01" comes before "10". This means you'll have to decide how long your keys can be at most, e.g. "000001" for numbers below a million.

Note that Firebase doesn't use such sequential numbers for its keys for many good reasons. I highly recommend checking out Best Practices: Arrays in Firebase to read more on this.

answered Sep 09 '19 at 14:55

Frank van Puffelen

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how do I add to my arraylist a check if current size is less then 10 add 0 to the place? – Alon Shlider Sep 10 '19 at 10:15
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See https://stackoverflow.com/questions/4051887/how-to-format-a-java-string-with-leading-zero – Frank van Puffelen Sep 10 '19 at 13:00

Firebase can't handle single digit numbers in array size

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