Android Question How to check a list is null or not

Rafi Fahreza · May 1, 2020

hi guys, i just tried some code to check a list isnull or not, but i got some error what's wrong with my code?

List Check:

Wait For(j) JobDone(j As HttpJob)
    If j.Success Then
        Dim parser As JSONParser
        parser.Initialize(j.GetString)
        Dim root As List = parser.NextArray
        If (root.Size = Null) Or root.Size = 0 Then
            Detail.day_2 = Detail.day_1 - Rnd(10,50)
            Detail.d_day_2 = Detail.d_day_1 - Rnd(1,8)

Erel · May 1, 2020

Rafi Fahreza said:
but i got some error

If the error is not confidential it will be easier to help you if you post it.

parser.NextArray will never return Null.

Rafi Fahreza · May 1, 2020

Erel said:
If the error is not confidential it will be easier to help you if you post it.

parser.NextArray will never return Null.

in this case i used an API that sometime give me a response like this

Erel · May 1, 2020

It will not be Null. It will return a zero size list.

Rafi Fahreza · May 1, 2020

Erel said:
It will not be Null. It will return a zero size list.

B4X:

 If root.Size = 0 Then
            Detail.day_2 = Detail.day_1 - Rnd(10,50)
            Detail.d_day_2 = Detail.d_day_1 - Rnd(1,8)

so this is the right code?

Erel · May 3, 2020

The question was answered, the list will not be null. If you want to do something special when the list is empty then your code is correct.

Android Question How to check a list is null or not

Rafi Fahreza

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Erel

B4X founder

Rafi Fahreza

Member

Erel

B4X founder

Rafi Fahreza

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Erel

B4X founder

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