@Override 
public void onWindowFocusChanged(boolean hasFocus) { 
super.onWindowFocusChanged(hasFocus); 
if (hasFocus && Build.VERSION.SDK_INT >= 19) { 
View decorView = getWindow().getDecorView(); 
decorView.setSystemUiVisibility( 
View.SYSTEM_UI_FLAG_LAYOUT_STABLE 
| View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION 
| View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN 
| View.SYSTEM_UI_FLAG_HIDE_NAVIGATION 
| View.SYSTEM_UI_FLAG_FULLSCREEN 
| View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY); 
} 
}