android-studio - 在 Android Studio 中使用 Flutter 进行调试时如何“设置值...”
问题描述
问题
以下图片和代码是使用“New Flutter Project”创建 Flutter App 时的默认设置。
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',
theme: new ThemeData(
primarySwatch: Colors.blue,
),
home: new MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => new _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
void _incrementCounter() {
setState(() {
_counter++; // <- I set a breakpoint
});
}
@override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text(widget.title),
),
body: new Center(
child: new Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
new Text(
'You have pushed the button this many times:',
),
new Text(
'$_counter',
style: Theme.of(context).textTheme.display1,
),
],
),
),
floatingActionButton: new FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: new Icon(Icons.add),
), // This trailing comma makes auto-formatting nicer for build methods.
);
}
}
我试图通过在代码中放置一个断点来“设置值...”,当使用此代码进行调试时,_counter 会递增,但即使我将光标悬停也无法按下。
①“调试‘main.dart’(^D)”②断点③“设置值...”
问题
- 在 Android Studio 中使用 Flutter 进行调试时如何“设置值...”。
开发环境
- 安卓工作室 3.1.4
- 颤振 0.5.1
- 飞镖 2
- 为 x86 构建的 Android SDK
最好的祝福,
解决方案
虽然执行在断点处停止,setState
但没有任何效果。
setState
不会直接导致重新渲染,它只是将小部件标记为重新渲染所需。
下次同步信号来自显示器时,Flutter 会重建视图的陈旧部分。
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