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#1 Google Developer Android https://developer.android.com/training/index.html
#2 SkillShare The Android O and Java Developer Course - Build 9 Full Apps Paulo Dichone, App Developer and Teacher - https://www.skillshare.com/user/pdichone https://www.skillshare.com/classes/The-Android-O-and-Java-Developer-Course-Build-9-Full-Apps/1634932136
#3 DREAM MKE Build Something Great http://www.dreammke.com/?page_id=4931