Issue with CountryListSpinner

[wakim]

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Step 2: Describe your environment

• Android device: Nexus 5X
• Android OS version: 6.0.1
• Google Play Services version: 4.3.3
• Rooted device (Don't know any info on this)
• Firebase/Play Services SDK version: 17.2.2
• FirebaseUI version: 6.2.0

Step 3: Describe the problem:

Seeing some users having issues when doing sign in with sms provider, the app is crashing when opening the activity.

Seems related with #1734

Steps to reproduce:

1 - Users a getting in the sms login page
2 - App is crashing

Observed Results:

Caused by java.lang.NullPointerException
Attempt to invoke interface method 'int java.util.Collection.size()' on a null object reference
java.util.AbstractSet.removeAll (AbstractSet.java:99)
com.firebase.ui.auth.ui.phone.CountryListSpinner.getCountriesToDisplayInSpinner (CountryListSpinner.java)
com.firebase.ui.auth.ui.phone.CountryListSpinner.access$002 (CountryListSpinner.java)
com.firebase.ui.auth.ui.phone.CheckPhoneNumberFragment.setupCountrySpinner (CheckPhoneNumberFragment.java)
com.firebase.ui.auth.ui.phone.CheckPhoneNumberFragment.access$000 (CheckPhoneNumberFragment.java)
androidx.fragment.app.FragmentStateManager.activityCreated (FragmentStateManager.java)
androidx.fragment.app.FragmentManager.addAddedFragments (FragmentManager.java)
androidx.fragment.app.FragmentManager.dispatchPrimaryNavigationFragmentChanged (FragmentManager.java)
androidx.fragment.app.FragmentManager.dispatchPause (FragmentManager.java)
androidx.fragment.app.FragmentManager.addAddedFragments (FragmentManager.java)
androidx.fragment.app.BackStackRecord.executeOps (BackStackRecord.java)
androidx.fragment.app.FragmentManager.addAddedFragments (FragmentManager.java)
androidx.fragment.app.FragmentManager.addRetainedFragment (FragmentManager.java)
androidx.fragment.app.FragmentManager.attachFragment (FragmentManager.java)
androidx.fragment.app.FragmentManager.attachFragment (FragmentManager.java)
androidx.fragment.app.FragmentManager.detachFragment (FragmentManager.java)
androidx.fragment.app.FragmentManager.detachFragment (FragmentManager.java)
androidx.fragment.app.FragmentController.attachHost (FragmentController.java)
androidx.fragment.app.FragmentActivity.onStart (FragmentActivity.java)
androidx.appcompat.app.AppCompatActivity.onStart (AppCompatActivity.java)
android.app.Instrumentation.callActivityOnStart (Instrumentation.java:1237)
android.app.Activity.performStart (Activity.java:6268)
android.app.ActivityThread.performLaunchActivity (ActivityThread.java:2379)
android.app.ActivityThread.handleLaunchActivity (ActivityThread.java:2476)
android.app.ActivityThread.-wrap11 (ActivityThread.java)
android.app.ActivityThread$H.handleMessage (ActivityThread.java:1344)
android.os.Handler.dispatchMessage (Handler.java:102)
android.os.Looper.loop (Looper.java:148)
android.app.ActivityThread.main (ActivityThread.java:5421)
java.lang.reflect.Method.invoke (Method.java)
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run (ZygoteInit.java:726)
com.android.internal.os.ZygoteInit.main (ZygoteInit.java:616)

Expected Results:

It should work without errors

Relevant Code:

AuthUI.getInstance()
            .createSignInIntentBuilder()
            .setAvailableProviders(listOf(AuthUI.IdpConfig.PhoneBuilder().build()))
            .build()

startActivityForResult(intent, RC_FIREBASE_LOGIN)

My workaround i'm using for now is to provide a list of whitelisted countries:

providers = listOf(
    AuthUI.IdpConfig.PhoneBuilder()
   .setWhitelistedCountries(listOf("+55"))
   .build()
)
AuthUI.getInstance()
            .createSignInIntentBuilder()
            .setAvailableProviders(providers)
            .build()

startActivityForResult(intent, RC_FIREBASE_LOGIN)

[samtstern]

Duplicate of #1734