Create a Tabbed AppBar in Flutter with tabs inside the TabBar and TabBarView widget.
Source Code | https://github.com/JohannesMilke/tab_bar_example

TIMELINE
0:00 Introduction Create Tabbed AppBar 
0:10 Create TabBar With Tabs
0:33 Attach TabBar Controller To TabBar
1:00 Create TabBarView
2:18 Create Custom TabBar Controller 
3:31 Get Current Selected Tab From TabBar
4:01 Listen To Tab Changes In TabBar
4:39 Change Tab Programmatically In TabBar

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How to Make a Tabbed AppBar in Flutter
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