title: How do I notified when camera is used or opened by any other application
body: <p>I want to get notified whenever any other application opened or accessed camera. I already know that I can check <code>Camera.open()</code> and its exception. but for that I have to check every time using service but it drain battery so I want whenever opened camera just notified me and get its package name. I already read these.</p>
  
  <p><a href="https://stackoverflow.com/questions/11220288/how-to-find-whether-the-camera-is-in-use">How to find whether the camera is in use?</a></p>
  
  <p><a href="https://stackoverflow.com/questions/15862621/how-to-check-if-camera-is-opened-by-any-application">How to check if camera is opened by any application</a></p>