title: Hide Soft-keys in android and not to show even on user interaction during the app
body: <p>Note: Please don't close this question as duplicate as the other answers only hide the softkey bar [navigation bar at the bottom with 3 control buttons] till the user interaction is not there. </p>
  
  <p>Hi, 
  I am developing a paint app in which the user can draw similarly as in MS-paint. </p>
  
  <p>To use the full estate of user's screen, I wish to hide the softkeys bar while the user is drawing or painting anything.</p>
  
  <p><b>So, I know how to hide the soft-keys bar but on user interaction [on Any interaction] the soft-keys bar appear on the screen. [Before lollipop]</b></p>
  
  <p>Is there any way that I can hide the soft-keys bar and they only appear after the user has exited from the app. <b>[I think I have seen this happening in some of the games]</b></p>
  
  <p>Note: somewhere it was also stated that the OS shows the soft-keys bar so that some goofy app doesn't ruin user's experience.</p>
  
  <p>Any lead will be appreciated. </p>
  
  <p>Updates:
  1. This is the link that I had followed earlier: <a href="https://stackoverflow.com/questions/16291640/how-to-hide-the-soft-key-bar-on-android-phone">How to hide the soft-key bar on Android phone?</a></p>
  
  <ol start="2">
  <li>By soft-keys bar I mean the navigation bar at the bottom of the screen as shown in the question in point 1.</li>
  </ol>
  
  <p>Thanks.</p>