moosphan / android-daily-interview Goto Github PK
View Code? Open in Web Editor NEW:pushpin:每工作日更新一道 Android 面试题,小聚成河,大聚成江,共勉之~
:pushpin:每工作日更新一道 Android 面试题,小聚成河,大聚成江,共勉之~
小明从一楼到三楼用了6分钟,每层都是一样的速度,楼层高度一样,请问从一楼到六楼要用多长时间
如题,毕竟现在很少上 QQ 了。
希望大佬能创建一个微信群吧,Thanks~
也是专门写 Android 面试题的。。可以合作吗?
提示:什么是单例模式?实现方式?应用场景?
提示:
如果不考虑布局的排版要求,那肯定是的FrameLayout大于LinearLayout中,LinearLayout中和RelativeLayout的相差无几。
- FrameLayout中的子元素都堆在屏幕的左上角,子元素不能指定位置,绘制起来当然效率高
.2。在阅读RelativeLayout和LinearLayout的源码中,我发现有这么一段注释:
//所以,而不是跑步代码两次,我们只是
将宽度设置为“默认显示宽度” 我们没有运行代码两次,而是将宽度设置为“默认显示宽度”
楼上说的都是RelativeLayout会绘制两次,这到底是怎么回事???
@Petterpx @Moosphan @kongxiaoan
首先很抱歉,我上面的回答有误,实际上应该是 测量(Measure)两次,回到原因上面,是因为:
RelativeLayout会对子View做两次measure。这是由于RelativeLayout是基于相对位置的,而且子View会在横向和纵向两个方向上分布,因此,需要在横向和纵向分别进行一次measure过程。而LinearLayout只进行纵向或横向的测量,所以measure的时间会比RelativeLayout少很多。但是如果设置了 weight,在测量的过程中,LinearLayout会将设置过weight的和没设置的分别测量一次,这样就导致measure两次。
Originally posted by @Petterpx in #30 (comment)
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