Android Question Bad effect when closing an app

Sabotto

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When I close my app, with the click on "Exit", this effect is created as if the layout "exits and re-enters" (you see the white for a moment) before disappearing completely. The code I use to terminate launches a routine (StopSophosClient) which uses an Intent to terminate a service (OpenVPN) which I start at the beginning of the program to join a VPN. The StartActivity (Intent) causes this annoying flicker. Any suggestions?



B4X: 
' in B4XMainPage
Private Sub btnExit_Click

    StopSophosClient
    Sleep(2000)
    B4XPages.ClosePage(Me)
    ExitApplication
          
End Sub

Sub StopSophosClient
    Dim i As Intent
    i.Initialize(i.ACTION_MAIN, "")
    i.SetComponent("de.blinkt.openvpn/.api.DisconnectVPN")
    i.PutExtra("de.blinkt.openvpn.shortcutProfileName", "VPN_Telecontrollo")
    StartActivity(i) ' ---> This instruction causes the "undesirable effect"
End Sub
 
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Star-Dust

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I think it is the intent that makes the control return to the system and then when you return your app that was paused reappears
 
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Sabotto

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Licensed User
Yes, the cause is established I think. Let's see if anyone knows if and how to avoid it.
 
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Sabotto

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I noticed this thing (see code)
B4X: 
Private Sub btnExit_Click

    btnStart.Enabled=False 'Disabled the button!!!'
    btnExit.Enabled=False
    GL.bVPNstarted=False
    StopSophosClient
    'When the code arrives here btnStart is again Enabled!!!
    'So it is as if the Layout was restarted
    Sleep(2000)
    ToastMessageShow("VPN disconnessa",False)
    B4XPages.ClosePage(Me)
    ExitApplication
           
End Sub
 
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agraham

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Sabotto said:
'So it is as if the Layout was restarted
Click to expand...
It probably was, at least Activity_Resume will be run as the Activity came to the fore, maybe Activity_Create also. You can try putting a flag in Process_Globals and checking it at some appropriate places. Have an experiment.
 
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Sabotto

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agraham said:
It probably was, at least Activity_Resume will be run as the Activity came to the fore, maybe Activity_Create also. You can try putting a flag in Process_Globals and checking it at some appropriate places. Have an experiment.
Click to expand...
Yes, the B4xPage_Appear event is triggered. And that's why I found btnStart.enabled = True.
But beyond that, there is nothing special inside Appear. I can't understand why he does that "go out / in" layout. It should remain fixed !
B4X: 
Sub B4xPage_Appear
    btnStart.Enabled=True
    'and nothing more '
End Sub
Pendrush said:
Do not use ExitApplication.
Click to expand...
Yes, I deleted it. But that's not the problem
 
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LucaMs

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LucaMs said:
Secondo me, invece, il principale problema (non è detto che sia il solo) è che quella routine utilizzi un Intent per avviare nuovamente l'Activity Main (StartActivity(i))
Click to expand...
Translation:
In my opinion, however, the main problem (it is not necessarily the only one) is that routine uses an Intent to start the Activity Main again (StartActivity (i))
 
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Sabotto

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Licensed User
There is no doubt that the effect is caused by the StartActivity (i) statement. But I'm looking for the solution and not the cause.
Even when I launch the VPN service I use a StartActivity (intent), but in that case the effect does not happen.
B4X: 
Sub StartSophosClient
    Dim i As Intent
    i.Initialize(i.ACTION_MAIN, "")
    i.SetComponent("de.blinkt.openvpn/.LaunchVPN")
    i.PutExtra("de.blinkt.openvpn.shortcutProfileName", "VPN_Telecontrollo")
    i.PutExtra("de.blinkt.openvpn.AUTOCONNECT", True)
    StartActivity(i)
End Sub

Sub StopSophosClient
    Dim i As Intent
    i.Initialize(i.ACTION_MAIN, "")
    i.SetComponent("de.blinkt.openvpn/.api.DisconnectVPN")
    i.PutExtra("de.blinkt.openvpn.shortcutProfileName", "VPN_Telecontrollo")
    StartActivity(i)
End Sub
 
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Sabotto

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Licensed User
The two routines are to start (StartSophosClient) and close (StopSophosClient) an external app called "OpenVPN" to enter in a VPN, where I need to ping. The first is called as soon as my app starts and the second when I close my app.

Maybe I could use the same Intent? Or maybe there is another method to start and stop OpenVPN?
 
Last edited:
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Sabotto

Well-Known Member
Licensed User
Sorry...
Maybe you haven't read from the beginning ...?
I call B4xPages.ClosePage when I exit my app (see btnExit_click)
ExitApplication I eliminated it, ignore it.
Before exiting my app, I also close the VPN service that I had launched when starting my app
 
Last edited:
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