It isn’t a good idea to open a notifier while opening another screen.That will definitely force your app not to open another screen.You need to open it on Switches initialization.
I see many issues done by users because they switched screens not correct.
This below is now just one of many other solutions:
[blocks]
If you dont open/close screens correct your app will get possible runtime errors.
Possible errors: (example)
Unable to add window -- token android.os.BinderProxy@45d459c0 is not valid; is your activity running?
Iam sure you don’t want that.
Then please do it in the future and switch screens correct.
General Tips and Tricks for App Inventor/Makeroid
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Also see this:
The Notifier (.ShowChooseDialog) only works after the first initialization (Screen1.Initialize). If I switch to Screen2 and then back to Screen1, the Notifier no longer works. (You must reload Screen1)
Screen1 / Screen2
[grafik] [grafik]
bug_Notifier.aia (3.0 KB)
bug_Notifier.apk (4.9 MB)
Tested on Android 9 and 5. Doesn’t happen with AI2.