* This app is meaningless unless streaming use. Usage: 1.Stream the phone's screen with Chromecast, etc. 2.Run the Preview app. The app keeps camera's preview. You can place the phone at any place so that it works as a remote camera. - Fling (flick) can change front / back camera - Pinch can zoom the center of screen Typical camera-apps have annoying menus and buttons on screen, and can be shutdown involuntarily at a fixed period of time. This app keeps previewing camera as long as battery lasts.