Android Question App crashes when button back is pressed

Is this related to that change in handling of the Back key in some recent versions of Android? I recall Erel posted a workaround some time back. So, what I have in my app now is something like this:

(the bit about visible panels is so that if certain things are on screen - in this case panels for entering new info - they just get hidden, and the main display shown instead). backcounter is a global int, set to 0 whenever you want to ensure that two presses are needed to exit the app, which I use instead of a Yes/No dialog

I also check to see if the app's registered for notifications, and turn them off; in my GCM service, I then call a sub back in Main when the unregistration is done, called 'bye_bye', which does an Activity.finish for me.

Maybe it´s for software version. Both devices have the 4.4.4 android version and the emulator has 4.2.2

Your code works well but you need to add a timer to reset the backcounter variable after passing 3 o 4 seconds. If you press for second time the back button having spent two minutes the app will exit without showing the message.

Hi ivavilagu,

maybe the problem in your code lays in a missing "Return False" before the Activity.Finish.
Anyway, since the back key causes the Activity to enter its Pause sub with UserClosed=True, why you feel the need to call Activity.Finish there?
The following should do exactly the same:

Umberto

udg said:

Hi ivavilagu,

maybe the problem in your code lays in a missing "Return False" before the Activity.Finish.
Anyway, since the back key causes the Activity to enter its Pause sub with UserClosed=True, why you feel the need to call Activity.Finish there?
The following should do exactly the same:

B4X:

Sub Activity_KeyPress (KeyCode As Int) AsBoolean 'return true if you want to consume the event
If KeyCode = KeyCodes.KEYCODE_BACK Then
  If Msgbox2("Do you want to exit?", "", "Yes", "", "No", Null) = DialogResponse.POSITIVE Then
    Return False
  Else
    Return True
  End If
End If
End Sub

Umberto

Click to expand...

Hi udg,

With your code the app crashes too. Also crashes changing activity.finish for ExitApplication

ivavilagu said:

Also crashes changing activity.finish for ExitApplication

Click to expand...

??? where ???

In the source of "udg" user there isn't activity.finish command

where you have change it ??

Sergio

sirjo66 said:

??? where ???

In the source of "udg" user there isn't activity.finish command

where you have change it ??

Sergio

Click to expand...

sorry, I tried the udg code and the app crashes. I mean that changing the activity.finish line in the first post for ExitApplication the app also crashes.

If I don´t catch the button back event, the app exits without problem.

ivavilagu said:

you need to add a timer to reset the backcounter variable after passing 3 o 4 seconds. If you press for second time the back button having spent two minutes the app will exit without showing the message.

Click to expand...

Well, yes, I suppose so; in my case, I reset that counter whenever pretty much anything is done, via other ways. But, however you choose to handle it, that will solve your problem.

More details in this thread: http://www.b4x.com/android/forum/threads/android-4-3-pb-with-closing-the-app.31328/

It was 4.3 which introduced this issue, which is why things work in your emulator but not on the devices.

Hi,

found same thread already showed by Nigel in his post#8.
So following those directions should solve the problem.

udg

Yeah, it works with the Erel code.

Thanks to everyone!