app/src/main/java/com/firebase/uidemo/database/firestore/FirestoreChatActivity.java [96:106]:
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    public void onAuthStateChanged(@NonNull FirebaseAuth auth) {
        mBinding.sendButton.setEnabled(isSignedIn());
        mBinding.messageEdit.setEnabled(isSignedIn());

        if (isSignedIn()) {
            attachRecyclerViewAdapter();
        } else {
            Toast.makeText(this, R.string.signing_in, Toast.LENGTH_SHORT).show();
            auth.signInAnonymously().addOnCompleteListener(new SignInResultNotifier(this));
        }
    }
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app/src/main/java/com/firebase/uidemo/database/realtime/RealtimeDbChatActivity.java [82:92]:
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    public void onAuthStateChanged(@NonNull FirebaseAuth auth) {
        mBinding.sendButton.setEnabled(isSignedIn());
        mBinding.messageEdit.setEnabled(isSignedIn());

        if (isSignedIn()) {
            attachRecyclerViewAdapter();
        } else {
            Toast.makeText(this, R.string.signing_in, Toast.LENGTH_SHORT).show();
            auth.signInAnonymously().addOnCompleteListener(new SignInResultNotifier(this));
        }
    }
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