in app/src/main/java/com/google/firebase/example/fireeats/MainActivity.java [135:151]
public void onStart() {
super.onStart();
// Start sign in if necessary
if (shouldStartSignIn()) {
startSignIn();
return;
}
// Apply filters
onFilter(mViewModel.getFilters());
// Start listening for Firestore updates
if (mAdapter != null) {
mAdapter.startListening();
}
}