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

`Name`	`Date`	`Size`
Up to higher level directory
`android_contact.png`	21-Aug-2018	`959`
`ic_launcher.png`	21-Aug-2018	`2.9K`
`notification_icon.png`	21-Aug-2018	`609`