UI Flashes when singning in with one provider (phone number)

[Netstep]

Welcome to FirebaseUI and thanks for submitting an issue!

Step 1: Are you in the right place?

yes

Step 2: Describe your environment

• Android device: Samsung Galaxy A5 2016
• Android OS version: 7.0
• Google Play Services version: unknown/latest
• Firebase/Play Services SDK version: 11.4.2/26
• FirebaseUI version: 3.0.0

Step 3: Describe the problem:

When calling Sign in UI with one provider, a quick "flashing" activity appears before sign in activity open,
according the animated demo at Auth description page, it might be provider selection activity, but not sure.

Steps to reproduce:

1. Run sign in code with one provider (phone number)

Observed Results:

1. Some unwanted activity flashes on screen (quick open and close probably)
2. Phone number sign in activity opens

Expected Results:

Only Phone number sign in activity opens without "flashing"

Relevant Code:

startActivityForResult(
AuthUI.getInstance()
.createSignInIntentBuilder()
.setAvailableProviders(
Arrays.asList(
new AuthUI.IdpConfig.Builder(AuthUI.PHONE_VERIFICATION_PROVIDER).build()
.build(),
RC_SIGN_IN);

[SUPERCILEX]

I can't reproduce, can you try with the latest version of FirebaseUI (3.2.1)?

[samtstern]

Looks like KickoffActivity has been transparent since 1.1.0 - #495

So I can't really imagine where this comes from.

[samtstern]

@SUPERCILEX do you think this is closeable by #1189?

[SUPERCILEX]

Yes? Neither of us has been able to reproduce it so I guess close it for now and if devs bring it up, we can figure stuff out from there... SGTY? (Sound good to you?)

[samtstern]

@Netstep since we have not been able to reproduce and we just recently kicked off a huge re-write of a lot of the relevant code, I am going to close this as "Not Producible" for now. But if we see this again we will certainly re-open.