make animation to start or end when target view was be Visible or Gone or Invisible. make animation to cancel when target view be onDetachedFromWindow

圆O的圆心为(a,b),半径为R,点A与到X轴的为角α. 则点A的坐标为(a+R cosα,b+R sinα) @param width @param height @param radius @param angle @return

create animation or animations

call it when you finish the activity, when you call this,better don't call some kind of functions like RefreshHeader,because the reference of mHeaderV

Adds dividers to a RecyclerView with a LinearLayoutManager or its subclass oriented horizontally. @param canvas The {@link Canvas} onto which horizon

Adds dividers to a RecyclerView with a LinearLayoutManager or its subclass oriented vertically. @param canvas The {@link Canvas} onto which vertical

Called when an item has been dismissed by a swipe.<br/> <br/> Implementations should call {@link RecyclerView.Adapter#notifyItemRemoved(int)} after ad

Called when an item has been dragged far enough to trigger a move. This is called every time an item is shifted, and <strong>not</strong> at the end o