in app/src/main/java/com/google/firebase/example/fireeats/MainActivity.java [246:257]
private void startSignIn() {
// Sign in with FirebaseUI
Intent intent = FirebaseUtil.getAuthUI()
.createSignInIntentBuilder()
.setAvailableProviders(Collections.singletonList(
new AuthUI.IdpConfig.EmailBuilder().build()))
.setIsSmartLockEnabled(false)
.build();
startActivityForResult(intent, RC_SIGN_IN);
mViewModel.setIsSigningIn(true);
}