wrap_content match_parent in Flutter

main.dart

import 'package:flutter/material.dart';

Future<void> main() async {
  runApp(Builder(
    builder: (context) => const MyApp(),
  ));
}

class MyApp extends StatelessWidget {
  const MyApp({
    Key key,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text("Title"),
        ),
        body: Align(
          alignment: Alignment.topCenter,
          child: AndroidLayout(
            height: 48,
            width: wrap_content, // <-- Replace wrap_content with match_parent to fix the layout
            // width: match_parent,
            child: Container(
              color: Colors.black26,
              child: Stack(
                alignment: Alignment.center,
                children: const [
                  Positioned(
                    left: 8,
                    top: 0,
                    bottom: 0,
                    child: Icon(Icons.arrow_back),
                  ),
                  Text("Centered"),
                ],
              ),
            ),
          ),
        ),
      ),
    );
  }
}

class AndroidLayout extends StatelessWidget {
  const AndroidLayout({Key key, @required this.width, @required this.height, this.child}) : super(key: key);

  final double width;
  final double height;
  final Widget child;

  @override
  Widget build(BuildContext context) {
    return ConstrainedBox(
      constraints: BoxConstraints(
        minWidth: width,
        minHeight: height,
      ),
      child: child,
    );
  }
}

const double match_parent = double.infinity;
const double wrap_content = 0.0;