Layout bounds not showing in Fultter app but it shows for other apps

Question

I just started with flutter and created a blank app with default config, when I turned on show layouts bounds from developer options it is not showing any boundaries like any other app.

How is this happening?

Have a look at [Flutter visual debugging](https://flutter.io/docs/testing/debugging#visual-debugging) and [Flutter widget inspector](https://flutter.io/docs/development/tools/inspector#getting-started-with-the-inspector). — Jay, Feb 22 '19 at 06:55
In flutter everything is a Widgets. Widget rendering is handled by the ObjectRender in flutter. You can’t get the size or location on the screen of a widget, because a widget is like a blueprint, it’s not actually on the screen. It’s only a description of what variables the underlying render object should use. — Firzan Shaikh, Feb 22 '19 at 07:10
@FirzanShaikh Could you please explain how flutter renders layout that the android layout boundary doesn't recognize any layout? — Hamidreza Shokouhi, Jul 30 '19 at 12:22

score 35 · Answer 1 · edited Jan 22 '21 at 11:36

To show layouts bounds from developer options for Flutter apps, we have to do this

import this package in main.dart class.

import 'package:flutter/rendering.dart';

in build() or main() you have to set this debugPaintSizeEnabled variable as true.
```
debugPaintSizeEnabled = true;
```

Example: Here is my complete class

import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';

void main()
{
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.

  @override
  Widget build(BuildContext context) {
    debugPaintSizeEnabled = true;
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(    
        primarySwatch: Colors.blue,
      ),
    home: MyHomePage(title: 'Flutter Demo Home Page'),
    
    );
  }
}
class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);
  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.display1,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ),
    );
  }
}

This is exactly what I was looking for. – SilSur Jun 16 '19 at 13:05 — SilSur, Jun 16 '19 at 13:05
Perfect. It saved my lots of time. Thank You. – Sachin Tanpure Jul 08 '20 at 12:32 — Sachin Tanpure, Jul 08 '20 at 12:32

Layout bounds not showing in Fultter app but it shows for other apps

1 Answers1