public void turnLight(View v) {
        StatusBarUtil.setStatusBarLight(this);
    }

    public void turnDark(View v) {
        StatusBarUtil.setStatusBarDark(this);
    }

    public void turnTransparentLight(View v) {
        StatusBarUtil.setStatusBarTransparentAndLight(this);
    }

    public void turnTransparentDark(View v) {
        StatusBarUtil.setStatusBarTransparentAndDark(this);
    }