ViewConfiguration 和 ViewConfigurationCompat

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.

•  mMinimumFlingVelocity = (int) (density * 50 + 0.5f);

getScaledMaximumFlingVelocity()

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

• mMaximumFlingVelocity = (int) (density * 4000 + 0.5f);

getScaledTouchSlop ()

• Distance in pixels a touch can wander before we think the user is scrolling  。

•   mTouchSlop = (int) (density * 16 + 0.5f);

getScaledPagingTouchSlop ()

• Distance in pixels a touch can wander before we think the user is scrolling a full page

• mPagingTouchSlop = (int) (density * 32 + 0.5f);

在ViewConfigurationCompat 也有  getScaledPagingTouchSlop () 。所以要调用ViewConfigurationCompat的这个方法。