How to get height or width of a Widget in flutter?

You can get the heigh or width of a widget in flutter by using layout builder. 

import 'package:flutter/material.dart';

void main(List<String> args) {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});
  @
override

  Widget build(BuildContext context) {
    return const MaterialApp(
      home: Scaffold(
        body: MyLayoutWidget(),
      ),
    );
  }
}

class MyLayoutWidget extends StatelessWidget {
  const MyLayoutWidget({
    super.key,
  });
  @
override

  Widget build(BuildContext context) {
    return Center(
      child: Container(
        color: Colors.grey,
        height: 300,
        width: 300,
        child: LayoutBuilder(
          builder: (p0, p1) {
            return Center(
                child:
                    Text("height = ${p1.maxHeight}, width = ${p1.maxWidth}"));
          },
        ),
      ),
    );
  }
}

Thanks,