Android Question [SOLVED] B4XPages - Really strange B4XPage_Created event

[LucaMs]

As you can see, B4XPage_Created of paglobby is executed (or, better, it seems to be executed):

This is the code of that event routine (paglobby B4XPage, of course):

Well, you also see that the log is not executed, and in fact only a blank white page appears.

The code that opens the page:

BTW, I noticed that the Appear event is triggered twice but not only in this project of mine, even in a very simple test project

 

[Erel]

It is difficult to say anything. Start with the three pages example and try to reproduce it.

 

[LucaMs]

It is difficult to say anything. Start with the three pages example and try to reproduce it.

I know that I can reproduce only the "Appear twice" "problem", since the main one never happened to me before.

 

[LucaMs]

I know that I can reproduce only the "Appear twice" "problem", since the main one never happened to me before.

The second, minor, problem occurs when you open a page and close the one from which you do it.

Private Sub Button1_Click
    B4XPages.ShowPage("pagOne")
    B4XPages.ClosePage(Me)
End Sub

 

[LucaMs]

The second, minor, problem occurs when you open a page and close the one from which you do it.

Private Sub Button1_Click
    B4XPages.ShowPage("pagOne")
    B4XPages.ClosePage(Me)
End Sub

View attachment 127533

... and this is what happens if you "swap" those two lines of code:

The Disappear event of mainpage fires twice (this shouldn't happen either)

 

[LucaMs]

Since I am smarter than the son of a stone marten and a fox ?, in the B4XMainPage I added that page (paglobby) to the B4XPages using AddPageAndCreate instead of AddPage.

Here is the result (i.e. not even in this way the B4XPage_Created event-routine is actually executed, the log I wrote as the first line of this routine is not executed):

Very soon, in 2033, I will be able to unravel this mystery!

 

[LucaMs]

Since I am smarter than the son of a stone marten and a fox ?, in the B4XMainPage I added that page (paglobby) to the B4XPages using AddPageAndCreate instead of AddPage.

EDIT: pagLobby was initialized in B4XMainPage Initialize, when I created that animated gif; next I moved that initialization to B4XPage_Created but nothing changed.

 

[LucaMs]

EDIT: pagLobby was initialized in B4XMainPage Initialize, when I created that animated gif; next I moved that initialization to B4XPage_Created but nothing changed.

Finally I found the bug, doing what I wrote above: I realized that, instead, in the B4XMainPage Initialize I had initialized other pages but not that one.

I will definitely never make that mistake again, I will always write the Initialize right before the AddPage, but this type of error should have thrown an exception, the class was not initialized!


The anomaly of the double execution of the Appear or the Disappear (see attached project previously) is however a bug of B4XPages, I think.

 

[Erel]

The anomaly of the double execution of the Appear or the Disappear (see attached project previously) is however a bug of B4XPages, I think.

1. Note that closing the non-top page is not supported on B4i.
2. If you want to show the next page and close the current one then it is better to call:

B4XPages.ShowPageAndRemovePreviousPages("pagOne")

3. This is indeed a bug in B4XPages and it will be fixed in the next update.

 

[LucaMs]

2. If you want to show the next page and close the current one then it is better to call:

B4XPages.ShowPageAndRemovePreviousPages("pagOne")

...RemovePreviousPageS? Or Page?


EDIT: Pages, the stack.

 

[Erel]

s

It replaces the current pages stack with the new page.

 

[LucaMs]

s

It replaces the current pages stack with the new page.

Yes, I edited my post a few seconds seconds before your answer; thank you, Erel.