Android Question Best practice for conditional B4XPages initialization (Login/Registration flow)

[carlbertmx]

"Hi Erel and community,​

I'm implementing a registration flow in a B4A B4XPages project. I want to ensure that the B4XPages environment only initializes after a successful registration/login process handled by an external Activity (act_Registration).

My current approach in Main Activity:

1. In Activity_Resume, I check a global flag AppRegistered.
2. If False, I call StartActivity(act_Registration) and Return.
3. If True, I initialize B4XPagesManager (if not initialized) and delegate the rest of the life cycle.

In act_Registration:

1. I handle the UI and logic.
2. Upon success, I set Main.AppRegistered = True and call Activity.Finish.
3. I also use Return True in Activity_KeyPress (KeyCodes.KEYCODE_BACK) to force the user to stay in the registration flow.

My questions:

1. Is this the recommended way to "gatekeep" B4XPages initialization?
2. Are there any side effects regarding the BackStack or the B4XPages life cycle by delaying B4XPagesManager.Initialize this way?
3. In Main, I'm using moveTaskToBack(true) via JavaObject on the Back key to keep the app alive instead of closing it. Is this compatible with B4XPages internal navigation?

Thanks in advance for your guidance."

 

[Erel]

Is this the recommended way to "gatekeep" B4XPages initialization?

No.
You are making things more complicated than they should be. Don't add another activity unless you must.
Implement all the flow with B4XPages.

Small example here: https://www.b4x.com/android/forum/t...k-for-managing-multiple-pages.118901/#content

 

[josejad]

Hi:

Maybe the easiest wait would be:

    'B4XMain_Page->B4XPage_Created
    If UserIsLogged Then 'UserIsLogged could be a variable saved in KVS when the user logs in for first time
        ShowDashboard
    Else
        Login
    End If

Private Sub Login
    Root.LoadLayout("Login") 'Login
    B4XPages.SetTitle(Me, "Login")
End Sub

Public Sub ShowDashboard
    Root.RemoveAllViews 'You can call ShowDashboard not only when you open the app starts and the user is logged, but the first time the user logs in, so you want to hide the Login layout
    B4XPages.SetTitle(Me, "Dashboard")
    Root.LoadLayout("Dashboard")
    '... rest of your code
End Sub

You can take a look to these posts, too, as you can see Erel says in the #11 post: "Note that the first page added, in the Initialize sub, will be shown automatically."

[B4XPages] How to quickly load a B4XPage without showing MainPage

Hi: I'm starting to play with B4XPages, just adapting this example It has a login page an then 2 others. What I want to do is to save the logged user (i.e. in KVS) and, from then on, once you start the app check if the user is already logged, then go to the next page instead of B4XMainPage...

www.b4x.com

[B4XPages] jRDC2 + MySql CRUD + Login

Hi all: I'm starting (at last) to work with B4XPages, so I've started to adapt the B4XPages + B4XDrawer example. I think I’ve seen more examples with php + mysql, but no projects with Jrdc2. Maybe the dummy data and the UI are too basic, but you can get some ideas. What do we need? - A...

www.b4x.com