title: Activate video camera in the background
body: <p>I want to activate the video camera while my application is in the background.<br/>
  So in order to do it I created a service that start/stop the video camera...<br/><br/>
  The problem is that I need to create a <code>SurfaceView</code> in the main activity (the one that called to that service in my case) in order to <code>setPreviewDisplay</code>. But when my application is in the background I get <code>Application lost the surface</code> ERROR. <br/></p>
  
  <p>I know that I need a <code>SurfaceView</code> in order to activate the video camera, but there is a better solution to activate the video camera while my application is in the background?</p>