private void removeInterstitialAd() {
if (interstitialAd != null) {
interstitialAd.setAdListener(null);
interstitialAd.destroy();
interstitialAd = null;
}
}
private void showInterstitialAd(final String adId) {
removeInterstitialAd();
interstitialAd = new InterstitialAd(context);
interstitialAd.setPublisherId(appId);
interstitialAd.setAdListener(this);
interstitialAd.loadAd(new AdRequest());
}
