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A Structure is an organized group of information that defines a specific data set. There are many types of structures available in B4X, including Classes, database records, Maps, and custom types. In this lesson we will focus mainly on the custom type. Delphi users will recognize the custom type as
link: Another nice feature of Types is that you can serialize types instances to bytes with RandomAccessFile.WriteObject / WriteB4XObject. So instead of sa

Custom types are very useful and I wouldn't automatically prefer classes over types. Custom types are lighter, can be serialized and are very "simple". A custom type is a bag of fields with zero logic. You know what you are getting. This can be an advantage. Properties vs. public variables is a mat
link: What I'm about to write would be more suitable for Erel's thread: "Code Smells" - common mistakes and other tips, but it's just my opinion and I don'

Agraham has already explained it very clearly in post#2, post#7, post#10. (Dim A as int) is the primitive type, (Dim A(1) as int) is the non-primitive type.

"audio/vorbis, Application/ogg") types.Put("pdf","application/pdf") types.Put("pl","Application/x-perl") types.Put("png","image/png") types.Put("potx","Application/vnd.openxmlformats-officedocument.presentationml.template") types.Put("ppsx"
link: Put("gz","Application/x-gzip") types.Put("hqx","Application/mac-binhex40") types.Put("html","text/html") types.Put

Put("doc","Application/msword") types.Put("docx","Application/vnd.openxmlformats-officedocument.wordprocessingml.document") types.Put("dotx","Application/vnd.openxmlformats-officedocument.wordprocessingml.template") types.Put("es","Application/ecmascript") types.Put("exe"

It is not difficult. Custom types are like classes. If you have created a class, then you must create objects of the type of that class, creating a variable and initializing it; only at that point will you have an object, which you could add to a List or any other structure (Map, for example). It'

or Null if the ID doesn't exist - UpdateEvent: Attempts to update an Event and returns the number of Events that were updated - DeleteEvent: Attempts to delete an Event and returns the number of Events that were deleted - AddAttendeeToEvent: Adds an Attendee to an Event and returns the id of the ad

It's better to create "specialized" types but you could also create a generic type: Type tTwoValues(Value1 As Object, Value2 As Object) This way you will be able to use it in many situations.

1. Using activities instead of B4XPages. 2. As DonManfred wrong. Best to delete the global variables, hover over the type -> generate Create sub and use it: Private Sub pnlGraph_Touch (Action As Int, X As Float, Y As Float) Dim v As Vertex = CreateVertex(...)
link: you are reusing a global type. Instead you should create a new one, fill the data and add the new reference to the list. something like this? Sub G
link: Hello every one Sub Globals Dim lstEdges As List Type Vertex(vName As String,Xcoordinate As Double,Ycoordinate As Double,Color As String, Forbiden A

You need to understand that complex nodes like the spinner are not base nodes, they are more like a superimposition of several nodes. So any text based node will also be recognised as a textfield node, if it contains buttons as the spinner does, it will also be recognised as button, and so on, accor
link: Not sure how you are creating the Spinner but I tested this and it is only recognised as a Spinner, not as a Textfield. The code you posted for the i

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