Android Example [B4X] B4XPages - Converting to B4XPages

I'm opening this thread to collect tricks and caveats I'm coming across while converting my projects to B4XPages

CallSub from Service
Looks like a service that is started at boot may execute before the Main activity is created.
This was not a problem with CallSub, since it just won't be executed

CallSub(Main, "PopulateCLV")

Using B4XPages, a direct call to the MainPage sub will result in an exception.
I added some check before actually calling it

If (B4XPages.IsInitialized) Then
    If (B4XPages.MainPage.IsInitialized) Then
        B4XPages.MainPage.PopulateCLV
    End If
End If

Activity Attributes in the Manifest file
Since there's only one Activity in the B4XPages framework, and I was using the B4XPreferences dialog in a secondary activity, I had to change manifest from

SetActivityAttribute(Dash, android:windowSoftInputMode, adjustResize|stateHidden)

to

SetActivityAttribute(Main, android:windowSoftInputMode, adjustResize|stateHidden)

Closing
Looks like

B4XPages.ClosePage(Me)

behaves differently from

Activity.Finish

Finish actually calls Activity_Pause, while ClosePage does not call CloseRequest: keep in mind when converting Activity_Pause subs