颤振:向图像添加浮动动作按钮

你可以使用 Stack Positioned widget,您可以在这里阅读这些widget:

堆栈: https://docs.flutter.io/flutter/widgets/Stack-class.html

定位: https://docs.flutter.io/flutter/widgets/Positioned-class.html

        return new Scaffold(
              appBar: new AppBar(
                title: new Text("My Title"),
              ),
              body: new ListView(
                children: [
                  Stack(
                    children: <Widget>[
                      new Container(
                          padding: EdgeInsets.zero,
                          child: new Image.asset(
                        "assets/images/background_image.png",
                        fit: BoxFit.fitWidth,
                      )),
                      Positioned(
                        right: 0.0,
                        bottom: 0.0,
                        child: new FloatingActionButton(
                          child: const Icon(Icons.camera_alt),
                          backgroundColor: Colors.green.shade800,
                          onPressed: () {},
                        ),
                      ),
                    ],
                  ),
                  new Divider(),
                  new ListTile(
                    title: new Text('Email'),
                    leading: const Icon(Icons.email),
                    onTap: () {},
                  ),
                  new Divider(),
                ],
              ),
            );