admobadapter/src/main/java/com/clockbyte/admobadapter/bannerads/BannerAdPresetCyclingList.java
@Override
    public boolean add(BannerAdPreset expressAdPreset) {
        return !(expressAdPreset == null || !expressAdPreset.isValid())
                && super.add(expressAdPreset);
    }
@Override
    public boolean add(BannerAdPreset expressAdPreset) {
        return !(expressAdPreset == null || !expressAdPreset.isValid())
                && super.add(expressAdPreset);
    }
Tries to add an item to collection if it is valid {@link BannerAdPreset#isValid()}
@return true if item was added, false - otherwise