Android Code Snippet Read only Keys of a Node in Firebase Database via REST API

Code to get just the keys (nodes, childnames, ...) of a Database path.

It makes use of the "shallow" parameter, which is crucial if you work with large datasets.

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    wait for (FireBaseRTDB_EnumerateChilds("groups/cats")) complete(mapNodes As Map)


    Dim jg As JSONGenerator
    jg.Initialize(mapNodes)
    Log(jg.ToPrettyString(2))

Sub FireBaseRTDB_EnumerateChilds(strNode As String) As ResumableSub
    ' Info --> https://firebase.google.com/docs/database/rest/retrieve-data#shallow
    Dim mapRet As Map
    mapRet.Initialize
   
    Dim j As HttpJob
    j.Initialize("", Me)
    j.Download(Starter.strFirebaseProjectRefUrl & strNode & ".json"  & "?shallow=true")
   
    wait for (j) JobDone(job As HttpJob)
    If job.Success Then
        Dim JSON As JSONParser
        JSON.Initialize(j.GetString)
        mapRet = JSON.NextObject
        For Each k As String In mapRet.Keys
            mapRet.Put(k, Starter.strFirebaseProjectRefUrl & strNode & ".json")
        Next
    End If
    job.Release
   
    Return mapRet
End Sub

The "Starter.strFirebaseProjectRefUrl" is the URL you see on top of the database console:

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[DonManfred]

if you work with large datasets

FireBaseRTDB_EnumerateChilds("groups/cats")

You must have a lot of Cats