Android Question [SOLVED] [B4X] MainPage FirstTime

makis_best · Nov 11, 2020

Hello

With the Default method on Activity_Create we can check FirstTime run.
With B4XPages how we can check FirstTime?

Thank you.

stari · Nov 11, 2020

If FirstTime then

makis_best · Nov 11, 2020

stari said:
If FirstTime then

I know about Default method I wander about B4XPages
if FirstTime then not working.

Sabotto · Nov 11, 2020

In B4XPages, the Create event is only triggered once, it's not like the Activities!

DonManfred · Nov 11, 2020

As B4XPages never gets destroyed FirstTime = false never happen

makis_best · Nov 11, 2020

So I need to find a trick to emulate FirstTime.

LucaMs · Nov 11, 2020

Maybe he might need a "first time appeared".
A private variable in the Class_Globals would be sufficient.

B4X:

Sub Class_Globals
    Private mFirstTimeAppeared As Boolean = True


Private Sub B4XPage_Appear
   If mFirstTimeAppeared Then
   Else
   End If

   mFirstTimeAppeared = False
End Sub

makis_best · Nov 11, 2020

@LucaMs I try your idea using B4XPage_Appear and with B4XPage_Disappear but does not work.
keep running the code I want to run for once.

LucaMs · Nov 11, 2020

makis_best said:
@LucaMs I try your idea using B4XPage_Appear and with B4XPage_Disappear but does not work.
keep running the code I want to run for once.

I hope you haven't changed the value of mFirstTimeAppeared in the B4XPage_Disappear.
It should work.

LucaMs · Nov 11, 2020

As you know FirstTime doesn't mean "first absolute time you run this app".

makis_best · Nov 11, 2020

Correct... I just find it out... My mistake.
Now Working fine.
I mess around B4XPage_Appear and B4XPage_Disappear.

Thank you all.

Erel · Nov 12, 2020

Why such complicated solution??????
You almost never need to handle the Appear / Disappear events.

Put the code in B4XPage_Created of B4XMainPage class. It runs once. Exactly like Activity_Create (FirstTime = True)

giannimaione · Nov 12, 2020

Erel said:
Put the code in B4XPage_Created of B4XMainPage class. It runs once. Exactly like Activity_Create (FirstTime = True)

the boss is always right !

LucaMs · Nov 12, 2020

Erel said:
Why such complicated solution??????
You almost never need to handle the Appear / Disappear events.

Put the code in B4XPage_Created of B4XMainPage class. It runs once. Exactly like Activity_Create (FirstTime = True)

giannimaione said:
the boss is always right !

Not this time ?

If you have to, like I have to, show something and work on something that includes resumable calls only once, I can't write this code in the Created routine, then I need "such a "complicated" solution" ?

Erel · Nov 12, 2020

LucaMs said:
If you have to, like I have to, show something and work on something that includes resumable calls only once, I can't write this code in the Created routine, then I need "such a "complicated" solution"

Why? Create a sub and call it from the created event.

LucaMs · Nov 12, 2020

Erel said:
Why? Create a sub and call it from the created event.

Because the code to be executed requires Root has already been displayed.

Erel · Nov 12, 2020

Call it at the end of the Created event. You can also start the sub with Sleep(0) if you want to allow the layout to appear.

makis_best · Nov 12, 2020

Erel said:
Why such complicated solution??????
You almost never need to handle the Appear / Disappear events.

Put the code in B4XPage_Created of B4XMainPage class. It runs once. Exactly like Activity_Create (FirstTime = True)

And how we check FirstTime = False?
B4XPage_Created load only once not every time page show.

Erel · Nov 12, 2020

makis_best said:
B4XPage_Created load only once not every time page show.

And that is a very good thing.

If you do want to do something when the page appears then use that event.

In my experience, the Appear event, is used in many cases when developers try to imitate the complex activities behavior, and don't realize that you can directly access the page elements and do whatever you need immediately.

The Appear event can be useful to enable timers for example.

makis_best · Nov 12, 2020

Ok... In my case I load a layout first time the page created and I load a second one when I get back to the that page.
How else to do if not control B4XPage_Appear?

Android Question [SOLVED] [B4X] MainPage FirstTime

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