when i press back button, it will back to the previous screen and not exit the application . help me guys
You indicate you have other screens. The backpress function is probably not working as you expect because you are not switching screens correctly, and therefore you have other screens open when trying to exit the app.
Use different screens wisely
- Before starting to create another screen, first you should think about is it really necessary?
- See also Building apps with many screens and SteveJG's post about advantages/disadvantages, because in only one screen you also can use vertical arrangements to simulate different screens, just set the arrangements to visible = true/false as needed...
- See also Martyn_HK's example about how to use Tabs in App Inventor and another example from Cyd. and my Tabbed Screens Demo
If you decided to use different screens, then you should switch them correctly, else you will run out of memory after a while...
The recommended method of switching screens in App Inventor
(Thanks Taifun)
Also see demo: multiscreen.aia
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so it is not working if i have more than one screen?
No, but switching screens incorrectly may cause memory issues.