Android Question How to know if a list contained certain item

[Nuno Durães]

Hi everyone

I want to check if a certain item exists in a list. Is there a way to do that?

 

[Erel]

If List1.IndexOf(SomeObject) > -1 Then

 

[Chris2]

Or, if the items in the list are unique you could use a B4XSet -

[B4X] B4XCollections - More collections

B4XCollections is a b4x lib. It adds several cross platform collections. It includes a static module named B4XCollections which should be used to create new instances of the collections. You can either create new empty collections or pass the initial data. B4XSet - A set is a collection of...

www.b4x.com

[B4X] Count specific week days in a month + tutorial about B4XSet

Depends on DateUtils and B4XCollections: Sub CountSpecificDaysInMonth (Year As Int, Month As Int, RelevantDays As B4XSet) As Int Dim day As Long = DateUtils.SetDate(Year, Month, 1) Dim p As Period p.Days = 1 Dim total As Int Do While DateTime.GetMonth(day) = Month If...

www.b4x.com

This would be quicker with long lists/sets.

 

[Nuno Durães]

If List1.IndexOf(SomeObject) > -1 Then

Thank you. Once again