title: Camera preview is completely black after screen off, screen on
body: <p>I'm working with the CameraPreview in the API Demos that comes with the Android SDK. While the camera preview is running, if I turn off my screen and turn it on again, the camera preview is completely black. The device's camera application somehow manages to restore the camera preview, so there must be a way.</p>
  
  <p>Not all devices I've tried exhibit this behavior. I can't confirm, but it seems like the OS version matters.</p>