// Set the parent ad unit's ID for all ad units to be created under.
String parentAdUnitId = networkService.getCurrentNetwork().getEffectiveRootAdUnitId();
// Create a 300x250 web ad unit size.
Size webSize = new Size();
webSize.setWidth(300);
webSize.setHeight(250);
webSize.setIsAspectRatio(false);
AdUnitSize webAdUnitSize = new AdUnitSize();
webAdUnitSize.setSize(webSize);
webAdUnitSize.setEnvironmentType(EnvironmentType.BROWSER);
// Create a 640x360v video ad unit size with a companion.
Size videoSize = new Size();
videoSize.setWidth(640);
videoSize.setHeight(360);
videoSize.setIsAspectRatio(false);
AdUnitSize videoAdUnitSize = new AdUnitSize();
videoAdUnitSize.setSize(videoSize);
videoAdUnitSize.setCompanions(new AdUnitSize[] {webAdUnitSize});
videoAdUnitSize.setEnvironmentType(EnvironmentType.VIDEO_PLAYER);