Gradle,Android Studio

Boss: Great job can we change the UI by using a custom view..
Me:Hesitating a bit sure we can.Head back to my station and consult Stack overflow and start implementing.
Boss:Five minutes later you done and how is it so far.
Me:Am done am just rebuilding and cleaning my project yet in reality ain't done.Gradle built time to my rescue.
Boss:How comes it taking long yet you got a high end machine okay then let it built.
Me: Breathing a sigh of relief thanks gradle