Cross Reference: /developers/samples/android/notification/MessagingService/Application/src/main/res/drawable-xhdpi

`Name`	`Date`	`Size`
Up to higher level directory
`android_contact.png`	24-Aug-2016	`2.4K`
`ic_launcher.png`	24-Aug-2016	`6.6K`
`notification_icon.png`	24-Aug-2016	`1.2K`