FirebaseUI-Android: Requires IMMUTABLE tag crash on API 31

Step 2: Describe your environment

• Android device: Google Pixel 4 emulator
• Android OS version: Api 31
• Google Play Services version: 4.3.10
• Firebase/Play Services SDK version: Firebase BOM 28.3.1
• FirebaseUI version: 8.0.0

Step 3: Describe the problem:

Steps to reproduce:

Clicking on button to open Auth activity crashes app

Observed Results:

• 2021-09-01 19:52:52.192 8005-8005/hr.pavetic.simplify.debug E/AndroidRuntime: FATAL EXCEPTION: main Process: hr.pavetic.simplify.debug, PID: 8005 java.lang.IllegalArgumentException: hr.pavetic.simplify.debug: Targeting S+ (version 31 and above) requires that one of FLAG_IMMUTABLE or FLAG_MUTABLE be specified when creating a PendingIntent. Strongly consider using FLAG_IMMUTABLE, only use FLAG_MUTABLE if some functionality depends on the PendingIntent being mutable, e.g. if it needs to be used with inline replies or bubbles. at android.app.PendingIntent.checkFlags(PendingIntent.java:375) at android.app.PendingIntent.getActivityAsUser(PendingIntent.java:458) at android.app.PendingIntent.getActivity(PendingIntent.java:444) at android.app.PendingIntent.getActivity(PendingIntent.java:408) at com.google.android.gms.internal.auth-api.zzr.zzc(com.google.android.gms:play-services-auth@@19.0.0:19) at com.google.android.gms.auth.api.credentials.CredentialsClient.getHintPickerIntent(com.google.android.gms:play-services-auth@@19.0.0:10) at com.firebase.ui.auth.ui.phone.CheckPhoneHandler.fetchCredential(CheckPhoneHandler.java:28) at com.firebase.ui.auth.ui.phone.CheckPhoneNumberFragment.setDefaultCountryForSpinner(CheckPhoneNumberFragment.java:238) at com.firebase.ui.auth.ui.phone.CheckPhoneNumberFragment.onActivityCreated(CheckPhoneNumberFragment.java:127) at androidx.fragment.app.Fragment.performActivityCreated(Fragment.java:2994) at androidx.fragment.app.FragmentStateManager.activityCreated(FragmentStateManager.java:559) at androidx.fragment.app.FragmentStateManager.moveToExpectedState(FragmentStateManager.java:262) at androidx.fragment.app.FragmentManager.executeOpsTogether(FragmentManager.java:1797) at androidx.fragment.app.FragmentManager.removeRedundantOperationsAndExecute(FragmentManager.java:1715) at androidx.fragment.app.FragmentManager.execPendingActions(FragmentManager.java:1658) at androidx.fragment.app.FragmentManager.dispatchStateChange(FragmentManager.java:2780) at androidx.fragment.app.FragmentManager.dispatchActivityCreated(FragmentManager.java:2715) at androidx.fragment.app.FragmentController.dispatchActivityCreated(FragmentController.java:262) at androidx.fragment.app.FragmentActivity.onStart(FragmentActivity.java:478) at androidx.appcompat.app.AppCompatActivity.onStart(AppCompatActivity.java:246) at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1455) at android.app.Activity.performStart(Activity.java:8076) at android.app.ActivityThread.handleStartActivity(ActivityThread.java:3653) at android.app.servertransaction.TransactionExecutor.performLifecycleSequence(TransactionExecutor.java:221) at android.app.servertransaction.TransactionExecutor.cycleToPath(TransactionExecutor.java:201) at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:173) at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:97) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2203) at android.os.Handler.dispatchMessage(Handler.java:106) at android.os.Looper.loopOnce(Looper.java:201) at android.os.Looper.loop(Looper.java:288) at android.app.ActivityThread.main(ActivityThread.java:7822) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)

Expected Results:

• Opening activity

Relevant Code:

I was opening activity with ActivityResultLauncher, but after this error tried different approach with PendingIntent but still crashes.

`final Intent phoneAuthIntent = AuthUI.getInstance() .createSignInIntentBuilder() .setAvailableProviders(providers) .setLogo(R.drawable.simplify_logo) .setTheme(R.style.FirebaseAuthTheme) .setTosAndPrivacyPolicyUrls( getResources().getString(R.string.terms_and_conditions_url), getResources().getString(R.string.privacy_url)) .setIsSmartLockEnabled(!BuildConfig.DEBUG /* credentials /, true / hints */) .build();

    PendingIntent pendingIntent = PendingIntent.getActivity(requireActivity().getApplicationContext(),
            123, phoneAuthIntent,
            /* flags */ PendingIntent.FLAG_IMMUTABLE);

    //binding.authenticationAcceptButton.setOnClickListener(button -> signInLauncher.launch(phoneAuthIntent));
    binding.authenticationAcceptButton.setOnClickListener(button -> {
        try {
            pendingIntent.send(123);
        } catch (PendingIntent.CanceledException e) {
            e.printStackTrace();
        }
    });`