Android Question [SOLVED]B4XPages, GetPage purpose?

[incendio]

Hi guys,

I ran the example from this thread :

[B4X] B4XPages - Cross platform and simple framework for managing multiple pages

B4XPages is a library that serves two purposes: 1. Make it simple to develop B4A apps by solving almost all of the challenges involved with Android complex activities life cycle. B4XPages makes B4A behave more similar to B4J and B4i where the new "B4XPage" element is a regular object that is...

b4x.com

On B4xPage2 class there is there these code

Private Sub B4XPage_Created (Root1 As B4XView)
    Root = Root1
    'load the layout to Root
    Root.LoadLayout("Page2")
    Page3 = B4XPages.GetPage("Page 3")
End Sub

What is the use of this code?

Page3 = B4XPages.GetPage("Page 3")

Isn't it the Page3 already declared as a class of B4XPage3 ? Just like common class, why should get the instance again?
The code made it possible to use Page3 subs before it is initialized, is this the only purpose?

Changed the codes into these

Private Sub B4XPage_Created (Root1 As B4XView)
    Root = Root1
    'load the layout to Root
    Root.LoadLayout("Page2")
    Page3.Initialize
    'Page3 = B4XPages.GetPage("Page 3")
End Sub

App runs OK.

 

[Alexander Stolte]

Look what "Page3" is used for in this class, Erel accesses the 3rd (B4XPage3) page to make settings there without having them visible.

 

[Alexander Stolte]

In the case of "B4XPage2" he make an image of the canvas from "B4XPage3" and load it into the ImageView from "B4XPage2"

 

[Alexander Stolte]

But to finally answer the question.
With "GetPage" you can address the other pages, e.g. you can use public subs or variable ones in "Class_Globals".

 

[Erel]

Your code will not work. We don't want to create another different instance of B4XPage3. We want to access a very specific instance of B4XPage3 and one way to get it is with B4XPages.GetPage.

 

[incendio]

Your code will not work. We don't want to create another different instance of B4XPage3. We want to access a very specific instance of B4XPage3 and one way to get it is with B4XPages.GetPage.

It work OK, but it created another instance of B4XPage3.

I see now, you want to access the instance that was declared in B4XMainPage. OK, thanks for the explanation.