Android Question Help with JSON Data

Colin Evans · May 3, 2020

Hi could someone please help me I want to get the value of Count in the following JSON data

B4X:

{"count":0,"next":null,"previous":null,"results":[]}

which parsers as

B4X:

[LIST]
[*]next: null
[*]previous: null
[*]count: 0
[*]results
[/LIST]

normally if there is data return it would have a count value and then a list of data but I need to validate if there is no data, i.e. if count is zero, normally, I get the data using the following code because there is a count and I would get all the data from the results list but I can't find any examples that I can get the value of count

B4X:

Dim root As Map = parser.NextObject
            Dim Count As Map = root.Get("count")
            Dim results As List = root.Get("results")

Colin Evans · May 3, 2020

Sorry, I think I've found the way to do it

B4X:

    Dim root As Map = parser.NextObject
            Dim Count As String = root.Get("count")
                If Count = 0 Then
                    Msgbox("No data exists for this account","No Data")
                Else    
                Dim results As List = root.Get("results")

Peter Simpson · May 3, 2020

@Colin Evans have you searched the forum for JSON Tree???

B4X:

Dim parser As JSONParser
parser.Initialize("{"count":0,"next":null,"previous":null,"results":[]}")
Dim root As Map = parser.NextObject
Dim next As String = root.Get("next")
Dim previous As String = root.Get("previous")
Dim count As Int = root.Get("count")
Dim results As List = root.Get("results")

It's easy enough to modify the code to suit your needs...

Colin Evans · May 3, 2020

Thank you very mush, I did a search on JSON but couldn't find anything to help in identify what I need perhaps I should have been more specific in my search, thanks again, it's a lot better than my fudged attempt

Android Question Help with JSON Data

Colin Evans

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Colin Evans

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Peter Simpson

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Colin Evans

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Android Question Help with JSON Data

Colin Evans

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