Netflix just launched the ability stream content on Wi-Fi networks only from Android devices. In a brief post to the Netflix US & Canada blog, director of product management, Roma De, wrote:
We know many of you love to watch Netflix on your Android smartphones and tablets. We just launched a new feature where you can select to playback on Wi-Fi networks only. This means that while you can search, browse and enjoy all aspects of the Netflix app on a mobile data connection or Wi-Fi, you can choose (via a "Settings" feature) to playback on Wi-Fi networks only. Download the new Netflix app and enjoy Netflix!
Netflix launched a similar feature in an iOS update back in May. Android has always been further behind when it comes to Netflix, but things have certainly improved in that regard over the past year or so.