FlutterでAppBarの背景色を透明にする
下記の方法で行けた
body: Stack( children: <Widget>[ Container( //My container or any other widget color: Colors.blue, ), new Positioned( //Place it at the top, and not use the entire screen top: 0.0, left: 0.0, right: 0.0, child: AppBar(title: Text('Hello world'), backgroundColor: Colors.transparent, //No more green elevation: 0.0, //Shadow gone ),), ], )