Android Question B4XPages & shared constants

luke2012 · Aug 16, 2020

Hi all,
within a B4XPages framework (from @Erel) app I need to share some (app) global constants. For example:

B4X:

    Public Host As String = "https://acme.com"
    Public WSNodeURL As String = Host & "/node/"
    Public WSFormat As String = "?_format=json"

MY GOAL
I need to access them within all B4A and B4i components (modules, services, instanced classes). So I need a single and reliable point of access within both platform (Android and iOS).

WITHIN ANDROID
Within B4A app I can use "Starter" service to set the above public constants.

CROSS-PLATFORM ?
How I can set this within a cross platform application in order to refer to a single point of access for the above constants (so I can call "Starter.WSNodeURL " within B4A and B4i without code changes between the two platforms ?
Can I create a "Starter" code module within B4i and reference them like I do within B4A with "Starter.WSNodeURL" ?

B4X:

'B4i Code module
Sub Process_Globals
    Public Host As String = "https://acme.com"
    Public WSNodeURL As String = Host & "/node/"
    Public WSFormat As String = "?_format=json"
End Sub

Thanks in advance for your precious help
Luca.

Erel · Aug 16, 2020

Excellent.

This is exactly the purpose of B4XPages.GlobalContext. You can assign anything you like to this field, including a class instance or a custom type, and access it from wherever you like.

In B4A, it makes sense to assign it in the starter service.

luke2012 · Aug 16, 2020

Erel said:
Excellent.

This is exactly the purpose of B4XPages.GlobalContext. You can assign anything you like to this field, including a class instance or a custom type, and access it from wherever you like.

In B4A, it makes sense to assign it in the starter service.

Thank you for this great tip

So for example. Can I assign in this way ?

B4X:

'STARTER SERVICE
#Region  Service Attributes 
    #StartAtBoot: False
    #ExcludeFromLibrary: True
#End Region

Sub Process_Globals
    
End Sub

Sub Service_Create
    Public AppGlobals As clsGlobals
    AppGlobals.Initialize
    B4XPages.GlobalContext = AppGlobals
End Sub

So, in B4A, it makes sense to assign it in the starter service.
What about B4i ? Where to assign it in a secure (alway accessible) way within an iOS App?

Erel · Aug 17, 2020

In B4J and B4i, you should do it in Application_Start / AppStart.

Android Question B4XPages & shared constants

luke2012

Well-Known Member

Erel

B4X founder

luke2012

Well-Known Member

Erel

B4X founder

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Android Question B4XPages & shared constants

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