通常的做法是这样的：

private static boolean isStatusbarVisible(Activity activity) {        int uiOptions = activity.getWindow().getDecorView().getSystemUiVisibility();        boolean isStatusbarHide = ((uiOptions | View.SYSTEM_UI_FLAG_FULLSCREEN) == uiOptions);        return !isStatusbarHide;    }public static void hideStatusBar(Activity activity) {        if (isStatusbarVisible(activity)) {            int uiOptions = activity.getWindow().getDecorView().getSystemUiVisibility();            uiOptions |= View.SYSTEM_UI_FLAG_FULLSCREEN;            activity.getWindow().getDecorView().setSystemUiVisibility(uiOptions);        }    }

此方法大多数情况都能奏效，但是遇到Drawerlayout就歇菜了。目前还没有找到解决办法。