Jun Yong Neo thinks this is interesting: setContentView(R.layout.activity_main From 1. Getting Started: Diving In from Head First Android Development, 2nd Edition by David Griffiths, Dawn Griffiths Publisher: O'Reilly Media, Inc. Released: August 2017 Note Specify which layout to use Share this highlight http://www.safaribooksonline.com/a/head-first-android/10130458/ Twitter Facebook Google Plus Email Get Instant Access Now Start a Free Trial Learn about Safari for Business Have an account? Sign in. Minimise Unlock the rest of Head First Android Development, 2nd Edition and 30,000 other books and videos By clicking this box, you confirm that you have read and agree to the terms and conditions of our Membership Agreement, and you understand that when your trial period ends, you will be required to provide billing information if you wish to continue using the service. Unlock the rest of this book Start a Free 10-Day Trial loading Learn about Safari for Business Have an account? Sign in.