Binds a preference's summary to its value. More specifically, when the preference's value is changed, its summary (line of text below the preference t

获取中间的两个 点 @param scale

获得屏幕宽度 @param context

获得屏幕高度 @param context

可以提前获取网页的 statusCode 如200 404 Notice 需要异步 @param url 网页的url @return statusCode 默认-1

Helper method to determine if the device has an extra-large screen. For example, 10" tablets are extra-large.