在Android中，您可以通过调用方法setOnClickListener将OnClick绑定到按钮等view上。
在Flutter中，有两种方法:
1.如果Widget支持事件监听，则可以将一个函数传递给它并进行处理。例如，RaisedButton有一个onPressed参数
@override
Widget build(BuildContext context) {
return new RaisedButton(
onPressed: () {
print("click");
},
child: new Text("Button"));
}
2.如果Widget不支持事件监听，则可以将该Widget包装到GestureDetector中，并将处理函数传递给onTap参数
class SampleApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return new Scaffold(
body: new Center(
child: new GestureDetector(
child: new FlutterLogo(
size: 200.0,
),
onTap: () {
print("tap");
},
),
));
}
}
2.1.使用GestureDetector，可以监听多种手势
（1）Tap
onTapDown
onTapUp
onTap
onTapCancel
(2)Double tap
onDoubleTap 用户快速连续两次在同一位置轻敲屏幕
(3)长按
onLongPress
(4)垂直拖动
onVerticalDragStart
onVerticalDragUpdate
onVerticalDragEnd
(5)水平拖拽
onHorizontalDragStart
onHorizontalDragUpdate
onHorizontalDragEnd
2.2.示例：监听FlutterLogo的双击事件，双击时使其旋转。
void main() => runApp(DemoApp());
class DemoApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return new MaterialApp(
title: '导航演示1',
home: new MyAppHome(),
);
}
}
class MyAppHome extends StatefulWidget{
@override
_MyAppHomeState createState() => _MyAppHomeState();
}
class _MyAppHomeState extends State<MyAppHome> with TickerProviderStateMixin{
AnimationController controller;
CurvedAnimation curve;
@override
void initState() {
super.initState();
controller = new AnimationController(
duration: const Duration(milliseconds: 2000), vsync: this);
curve = new CurvedAnimation(parent: controller, curve: Curves.easeIn);
}
@override
Widget build(BuildContext context) {
return new Scaffold(
body: new Center(
child: new GestureDetector(
child: new RotationTransition(
turns: curve,
child: new FlutterLogo(
size: 200.0,
)),
onDoubleTap: () {
if (controller.isCompleted) {
controller.reverse();
} else {
controller.forward();
}
},
),
));
}
}
