How did u receive msg at background when back to homescreen

[lucasjinreal]

Hey, you did a good job, I am also wanna build a chat app, but more complicated, I am facing 2 problems:

1. receving msg when switch different tab (I have 2 tabs);
2. receviing msgs when app goes to background

Now for the first quesition, the msg will always repeat receive when setState called, and seconds has no clue to do this (BTW I using my own chat server side )