Hello, everyone. I was in MIT App Inventor, trying to make a Notifer tell the user that they should pick something when a Listpicker is Left Empty. I am having trouble doing so. Can someone help me? This is the Code I did so far.
Like so:
Best thing to do is to make the listpicker button invisible, and use another button to call the listpicker
or like this once the listpicker becomes empty:
