Android Question [B4xPages] How to always run a procedure when starting the program?

vecino · Nov 29, 2020

Hi, I need to run something whenever the program starts.
In the "Created" it runs the first time, if I close the program and reopen it, it doesn't run.
In the "Appair" it is not valid because it is executed when the page changes and returns to the first one.
Where do I put it?
It is to ask for a password, show a splash, etc.
In B4XMainPage I can't find the solution.
Do I put the code in the "Activiy Main"?
Thank you.

makis_best · Nov 29, 2020

Have you think about "Initialize"

vecino · Nov 29, 2020

Hello, where is "Initialize"?

MikeSW17 · Nov 29, 2020

Right Here: (On a new B4X project)

LucaMs · Nov 29, 2020

B4XMain page (class)

Public Sub Initialize

vecino · Nov 29, 2020

Here?

I believed that with B4XPage you should not write code in "Main".

LucaMs · Nov 29, 2020

vecino said:
I believed that with B4XPage you should not write code in "Main".

It is almost never necessary to write code in ACTIVITY Main.

LucaMs said:
B4XMain page (class)

Public Sub Initialize

B4XMainPage (which is a class).

makis_best · Nov 29, 2020

Don't write code on Main Page, only in B4XMainPage and there use Initialize.
On main page write code only for extreme specific cases.

vecino · Nov 29, 2020

It also doesn't work in Initialize :/
The first time it does run showsplash and other things.
Then I close, I open ... and it doesn't go through Initialize.
I have put "logs" to follow it and you can see that it does not go through Initialize.

makis_best · Nov 29, 2020

When you say close... you mean that you exit application?
The Logs are set to main or B4XMainPage?

Copy the text of your Log and paste it here using <code> </code>
Don't post it here as picture.

LucaMs · Nov 29, 2020

I think you need something like this:
https://www.b4x.com/android/forum/threads/solved-b4x-mainpage-firsttime.124457/post-777152
(to show the splash screen)

vecino · Nov 30, 2020

makis_best said:
When you say close... you mean that you exit application?

Yes, exit application.

vecino · Nov 30, 2020

LucaMs said:
I think you need something like this:
https://www.b4x.com/android/forum/threads/solved-b4x-mainpage-firsttime.124457/post-777152
(to show the splash screen)

It is exactly the same case.
When you start the application you must ask for a password (among other things).
If I exit the application and enter again, it does not go through "Create", so it does not ask for the password.

I think Erel is not right in what he says in that other thread (now I will get hits from all sides )
In the activities the "Create" is always executed when you start the application, if you exit the application and re-enter then it runs again create (although in that case is not "firstime").
However, with B4Xpages this does not happen, there is no other solution than to use a variable, as discussed in this other thread.

That's the conclusion I've reached after many tests.
Hopefully there is a more appropriate solution.
Thank you.

LucaMs · Nov 30, 2020

vecino said:
Hopefully there is a more appropriate solution.

For your case, I would have a better solution: create a page that serves exclusively to show the splash screen and for the user authentication.

vecino · Nov 30, 2020

Yes, but how do you make it always run when you start the application?
Even if you leave the application and return to the moment, always run.

LucaMs · Nov 30, 2020

vecino said:
Yes, but how do you make it always run when you start the application?
Even if you leave the application and return to the moment, always run.

B4X:

Private Sub B4XPage_Created (Root1 As B4XView)
    ' ...
    '...  
    B4XPages.ShowPage("pagLogin")
End Sub

vecino · Nov 30, 2020

But that's the problem, isn't it?
That "Created" is not executed after leaving the application and entering again, so that other page would not be shown either.

LucaMs · Nov 30, 2020

Try this (not great, quickly written)

vecino · Nov 30, 2020

It's the same problem, it doesn't ask for the "login" again because it doesn't go through "Created", except the first time.

LucaMs · Nov 30, 2020

Why do you need to login (and show the splash screen) twice?

If the user forces the app to close, or the operating system kills it or when the user turns off the device and turns it back on the next day, the splash screen and login will be displayed.

Android Question [B4xPages] How to always run a procedure when starting the program?

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