Contains methods to standard constants used in the UI for timeouts, sizes, and distances.

一。几个常用的方法

返回初始化滑动的最大速度值和最小速度值，以像素/秒为单位

getScaledMinimumFlingVelocity()

• Minimum velocity to initiate a fling, as measured in pixels per second.

getScaledMaximumFlingVelocity()

• Maximum velocity to initiate a fling, as measured in pixels per second.

getScaledTouchSlop ()

•  Distance in pixels a touch can wander before we think the user is scrolling  。 Touchslop通常用来防止用户的其他触摸行为被判断为滑动。

 getScaledPagingTouchSlop ()