Android Question B4xpages, cross page variables

[james_sgp]

Hi, having an issue; that's seems so obvious, yet I can`t see my error.

I have declared a public variable in 'B4xMainPage'

Sub Class_Globals
    Private Root As B4XView
    Private xui As XUI
    
    Public ques_level As Int = 0

When I try to access 'ques_level' on B4Xpage 'win_page' using:

private Sub B4XPage_appear
    Log(MP.ques_level)

I am not getting the most recent value of the variable, I`m only getting the first value I set in (in 'B4xMainPage')...e.g. at first I set to 3, and I get 3 on the other page; but when I then change it t 2 on 'B4XMainPage' I still only get 3 on 'win_page'?

Would appreciate someone pointing out my stupidity, please

Thanks, James

 

[agraham]

B4xMainPage.ques_level ?

 

[james_sgp]

B4xMainPage.ques_level ?

Im already delcaring
'Private MP as B4xmainpage' on the 'win_page'. If i try to use b4xmanpage as u suggested it is not recognised...

James

 

[klaus]

Without seeing more code, impossible to give a concrete advice.
Post a small project showing the problem.
I use the same kind of declaration as you in my programs and it works as expected.

 

[james_sgp]

Here is a sample app that has the same issue.

 

[pliroforikos]

MP in your first code tells me that you have declare a new instance of MainPage and so the ques_level=0
as first value.

You shoulfd use log(B4XPages.MainPage.ques_level)

 

[james_sgp]

Thanks for the suggestion, it kinda made sense. However, doesn`t give the desired result, see screenshot

 

[agraham]

If i try to use b4xmanpage as u suggested it is not recognised...

Yea, sorry. I forgot B4XMainPage was a class not an Activity. I don't use B4XPages at the moment. As an oldie set in my ways I find the old way with individual Activities simpler.

 

[agraham]

What you are doing seems convoluted and unnecessary but your problem is that you only set your MP variable once in your single instance of win_page, when it is created, but you are creating further instances of B4XMainPage so your MP variable only refers to the first instance of B4XMainPage, where ques_level = 1, and not to your newest instance.

 

[LucaMs]

To refer to the B4XMainPage (from within another page); you don't need to create a variable for it or add it to the B4XPages, it's already there:

B4XPages.MainPage.ques_level = B4XPages.MainPage.ques_level * 7

 

[agraham]

To refer to the B4XMainPage (from within another page); you don't need to create a variable for it

In this case he is creating multiple instances (probably a bad idea) of B4XMainPage and B4XPages.MainPage is again set only once when B4xPagesManager is Initialized so that will only ever refer to the initial instance.

 

[klaus]

I do not understand why you added a new B4XMainPage with Public level_p As B4XMainPage?
Attached your project modified.

 

[james_sgp]

SOLVED...
Great thanks for all the feedback, and the solution. I`m new to B4Xpages (my 2nd app), and was basing things on the B4Xpages triple page example; which I`d obviously misinterpreted at some point.

Stay safe... ?