ScrollView的android:fillViewport="true"

http://stackoverflow.com/questions/2599837/linearlayout-not-expanding-inside-a-scrollview

http://blog.youkuaiyun.com/linqingf/article/details/6573602

当fillViewport="true" 设置为 true里 , scrollView里的 Layout 会自动  扩展到 铺满屏幕