title: Back key or Delete key of Soft Keyboard not working in 4.4 and 5.0?
body: <p>I am facing the issue of back key or del key which is not working in 4.4 and 5.0.1 devices ?
  When I press the back key of softkeyboard below method is not calling.</p>
  
  <pre><code> Username.setOnKeyListener(controller);
   Password.setOnKeyListener(controller);
  
      @Override
      public boolean onKey(View v, int keyCode, KeyEvent event) {
          if(event.getAction() == KeyEvent.KEYCODE_DEL){
              getActivity().setDisableLoginButton();
          }
          return false;
      }
  </code></pre>
  
  <p>Anyone suggest me what should I do ?
  I am disabling the button if there's no input in username &amp; password.
  Please, suggest me also suggest me other solutions if you have.</p>