setLargeIcon
Sets the large icon that is shown in the notification. Icons will be scaled on versions before API 27. Starting in API 27, the framework does this automatically.
Sets the large icon that is shown in the notification. Starting in API 27, the framework scales icons automatically. Before API 27, for safety, #reduceLargeIconSize
should be called on bitmaps before putting them in an Icon
and passing them into this function.