Warning: The current Google Cast SDK is a preview SDK intended for development and testing purposes only, not for production apps. Google may change this SDK significantly prior to the official release of the Google Cast SDK. We strongly recommend that you do not publicly distribute any application using this preview SDK, as this preview SDK will no longer be supported after the official SDK is released (which will cause applications based only on the preview SDK to break).
Applications using this preview SDK will work only on Chromecast receiver devices that are whitelisted for development. Google will provide whitelisting for Google Cast receivers for development and testing purposes until the final SDK is released. See Whitelisting your receiver.