FAB: Go away when hidden

Signed-off-by: Peter Cai <xqsx43cxy@126.com>
TimeLineFragment: Optimize FAB Showing & Hiding Logic

Signed-off-by: Peter Cai <xqsx43cxy@126.com>
TimeLineFragment: Do not hide ActionBar when refreshing

Signed-off-by: Peter Cai <xqsx43cxy@126.com>