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