How to force Admob to refresh on Android

Question

I have an app with Admob ads on it but I find that when I use it the ad almost never refreshes because I don\'t change activities, instead I just update a text view when but

Answer 1

private AdRequest adRequest = null;
private void loadBannerRun() {
    if(adRequest != null) {
        adView.loadAd(adRequest);
        return;
    }
    adView.setAdUnitId(BANNER_AD_TEST);
    adRequest = new AdRequest.Builder().build();
    adView.loadAd(adRequest);
}

test please