title: Disable back, Home and Recent button in android programmatically
body: <p>I am developing lock screen application in android. </p>
  
  <p>The problem is how to disable Back, Home and Recent button in the activity?</p>
  
  <p>I found that back button disable using:</p>
  
  <pre><code>@Override
      public void onBackPressed() {
          return;
      }
  </code></pre>
  
  <p>But how to disable the others?</p>
  
  <p>Problem image: <a href="http://postimg.org/image/a0tnk7kr5/" rel="nofollow">http://postimg.org/image/a0tnk7kr5/</a></p>