Android Question Log Out

[Kostas_Bar]

Hello everyone!

I'm building an android app with B4X and I want to create a Log Out Button on every screen.
The way I thought of it to work is this:

1. Call the LogIn page (B4XPages.ShowPage("MainPage"))
2. The page that the user was on disappears.
3. the B4XPage_Disappear() Sub is called.
4. In that sub I delete every action (Activity1.Finish()) and return the screen to it's initial form, forwhen the user logs in again and wants to use it.

The problem is that when I call the B4XPage_Disappear() Sub the app crashes.
There is obviously a problem with the way I handle the Activity.
Here are some code snippets you may find useful:

[CODE lang="b4x" title="Activity Related Code" highlight="17, 42"]Sub Class_Globals
Private Root As B4XView 'ignore
Private xui As XUI 'ignore

Public dialog As B4XDialog
Public token As String
Private ScanHereMC As B4XView
Private NewPaletteBtnMC As B4XView
Private QuantityMC As B4XView
Private AcceptInputBtnMC As B4XView
Private i As Int = 0
Public url As String
Private PanelMC As B4XView
Private LogOutMainPage As B4XView

Private LogIn As B4XMainPage
Private Activity1 As Activity
End Sub

Public Sub Initialize As Object
Return Me
End Sub

Private Sub B4XPage_Created (Root1 As B4XView)
' should i use Activity1 instead of Root1 here?
Root = Root1
'load the layout to Root
Root.LoadLayout("Lay_MoveContainer")
ScanHereMC.RequestFocus()
Dim cs As CSBuilder
cs.Initialize
cs.Image(LoadBitmap(File.DirAssets, "image002.png"), 40dip, 40dip, True).Append(CRLF).Append(" Μετακίνηση Περιεκτών").Alignment("ALIGN_NORMAL")
cs.PopAll
TitleSplit.Text = cs

LogIn.Initialize
B4XPages.AddPageAndCreate("MainPage", LogIn)
End Sub

Private Sub B4XPage_Disappear()
Try
Activity1.Finish()
Catch
Log(LastException)
End Try
End Sub[/CODE]

The app crashes even though I used a try-catch statement and couldn't find any work arounds, even though I tried some things.
I saw in the Booklets that there are some problems with using "Activity" when writing B4X.

Finally if there is another (possibly better) routine for the LogOut, please let me know.

 

[Erel]

Sounds like a bad idea.
Tip: the less you use B4XPage_Appear / Disappear the better. In most cases they only make things more complicated then the should be.
You can simply create a Reset sub in each of the pages and call it when you want to reset the layout.

 

[aeric]

You can simply create a Reset sub in each of the pages and call it when you want to reset the layout.

What is the recommended way for the Reset code?

Like this?

Public Sub Reset
    Root.RemoveAllViews
    Root.LoadLayout("MainPage")
End Sub

 

[Erel]

Like this?

Looks good.