How do I get value from CloudDB in background if I pressed 'back' button to leave?

MIT App Inventor Help
1

I tried to receive message by CloudDB
when I close my app, so I search solution in here.
Someone mentioned 'TaifunTools' so I downloaded it.
I import it to my app and tried to receive message when I pressed 'back' button to leave, but noting happened.

I wanted to make an app like WhatsApp. An app can send message, receive message etc.
ACNHFreeMaterial(001001004a,V.1.1.4α).aia (236.2 KB)

2

Welcome there,

Please post a screenshot of your relevant blocks or export your AIA file here to get help.

3

It is very simple for making
If you want I'll make one for you
Just DM me