title: how to detect image file in android
body: <p>I have a requirement where existing image file extension being changed to something else and saved on device.</p>
  
  <p>When i change extension of .jpg to some thing like .xyz, this same image file is not being detected by android as a image file and not able to open the same. Even gallery doesnot detect this file.</p>
  
  <p>Now how to make android detect this file as a image file ? </p>
  
  <p>-Thanks &amp; regards,
  Manju</p>