不要在此进行耗时的操作

处理多指触控的点击事件

处理多指触控的点击事件

reset header view's height.

reset header view's height. 重置headerheight的高度 逻辑：1、如果状态处于非refreshing，则回滚到height=0状态2；2、如果状态处于refreshing，则回滚到stretchheight高度

Reset the progress spinner to default rotation, start and end angles.

@param scale Set the scale of the arrowhead for the spinner.

Set the colors the progress spinner alternates between. @param colors Array of integers describing the colors. Must be non-<code>null</code>.

Notify the widget that refresh state has changed. Do not call this when refresh is triggered by a swipe gesture. @param refreshing Whether or not the

Set the start and end trim for the progress spinner arc. @param startAngle start angle @param endAngle end angle

@param show Set to true to display the arrowhead on the progress spinner.

stop refresh, reset header view.

If the start / end trim are offset to begin with, store them so that animation starts from that offset.

完成的百分比 @param percent between[0,1]

Update the ring color if this is within the last 25% of the animation. The new ring color will be a translation from the starting ring color to the ne

Set the overall size for the progress spinner. This updates the radius and stroke width of the ring. @param size One of {@link MaterialProgressDrawab

创建回弹动画 上圆半径减速恢复至最大半径 下圆半径减速恢复至最大半径 圆心距减速从最大值减到0(下圆Y从当前位置移动到上圆Y)。 @return

convert drawable to bitmap @param drawable @return

获得两个圆切线与圆心连线的夹角 @return