Hiding status bar when softkeyboard is visible

I want to hide status bar in my status bar and this is how I do it:

if (Build.VERSION.SDK_INT < 16) {
            activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
            activity.getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN);
        } else {
            View decorView = activity.getWindow().getDecorView();
            int uiOptions = View.SYSTEM_UI_FLAG_FULLSCREEN
            decorView.setSystemUiVisibility(uiOptions);
        }

}

The issue is when the soft keyboard becomes visible (typing in an EditText), the status bar comes back.