View repaint workaround

I need hide footer in my Android application when soft keyboard appears.

Also I need show footer when soft keyboard disappears.

I create my own MyRelativeLayout and extend it from regular RelativeLayout.

Then I redefine one method:

 @Override
 protected void onSizeChanged(int w, int h, int oldw, int oldh) {
  super.onSizeChanged(w, h, oldw, oldh);
  
  final LinearLayout footer = (LinearLayout) findViewById(R.id.footer);
  if (oldh>h) {
   footer.setVisibility(RelativeLayout.GONE);
  } else {
   footer.setVisibility(RelativeLayout.VISIBLE);
  }
  
  //This is workaround for repaint footer
  //It seems there are no another ways for repaint footer  
  final Handler handler = new Handler(new Callback() {
   
   @Override
   public boolean handleMessage(Message msg) {
    footer.invalidate();
    footer.requestLayout();
    return true;
   }
  });
  handler.sendEmptyMessage(0); 

 }