AppBar( flexibleSpace: Container( decoration: BoxDecoration( gradient: LinearGradient( colors: [Colors.cyan, Colors.yellow], stops: [0.5, 1.0], ), ), ), ),
appBar: AppBar( title: Text('Flutter Demo'), flexibleSpace: Container( decoration: BoxDecoration( gradient: LinearGradient( begin: Alignment.centerLeft, end: Alignment.centerRight, colors: <Color>[ Colors.red, Colors.blue ], ), ), ), ),