您可以将GestureDetector添加为堆栈的父级，然后注册
onTapDownDetails侦听器。这应该在每个tapdown事件上调用您的侦听器，并在您的侦听器的TapDownDetails参数中使用Tap的全局偏移量。
这是演示相同代码的示例代码。
import 'package:flutter/material.dart';void main() { runApp(new MyApp());}class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return new MaterialApp( title: 'Flutter Demo', home: new MyHomePage(), ); }}class MyHomePage extends StatefulWidget { @override MyHomePageState createState() => new MyHomePageState();}class MyHomePageState extends State<MyHomePage> { @override Widget build(BuildContext context) { return new Scaffold( appBar: new AppBar( title: new Text('Popup Demo'), ), body: new MyWidget()); }}class MyWidget extends StatefulWidget { @override State<StatefulWidget> createState() { return new MyWidgetState(); }}class MyWidgetState extends State<MyWidget> { double posx = 100.0; double posy = 100.0; void onTapDown(BuildContext context, TapDownDetails details) { print('${details.globalPosition}'); final RenderBox box = context.findRenderObject(); final Offset localOffset = box.globalToLocal(details.globalPosition); setState(() { posx = localOffset.dx; posy = localOffset.dy; }); } @override Widget build(BuildContext context) { return new GestureDetector( onTapDown: (TapDownDetails details) => onTapDown(context, details), child: new Stack(fit: StackFit.expand, children: <Widget>[ // Hack to expand stack to fill all the space. There must be a better // way to do it. new Container(color: Colors.white), new Positioned( child: new Text('hello'), left: posx, top: posy, ) ]), ); }}
