requestHint.java

private void requestHint() {
    HintRequest hintRequest = new HintRequest.Builder()
            .setPhoneNumberIdentifierSupported(true)
            .build();

    PendingIntent intent = Auth.CredentialsApi.getHintPickerIntent(
            googleApiClient, hintRequest);
    try {
        getActivity().startIntentSenderForResult(intent.getIntentSender(),
                RESOLVE_HINT, null, 0, 0, 0);
    } catch (IntentSender.SendIntentException e) {
        Timber.e(e);
    }
}