Fonts

Fonts are assets

Question: What is the issue with fonts and cross-platform?

Answer: No text visible? Make sure you have used fonts added to the project asset.
The default font for MaterialApp, Roboto, is not installed on all machines.

Example

If the host is missing some fonts, it can cause the text to not be rendered or worse the app might crash, the the pointer_demo solves this issue by including the fonts as asset.

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Code Sample for widgets.Listener',
      theme: ThemeData(
        // If the host is missing some fonts, it can cause the
        // text to not be rendered or worse the app might crash.
        fontFamily: 'Roboto',
        primarySwatch: Colors.blue,
      ),
      home: MyStatefulWidget(),
    );
  }
}

# [...]
flutter:

  fonts:
    - family: Roboto
      fonts:
        - asset: fonts/Roboto/Roboto-Thin.ttf
          weight: 100
        - asset: fonts/Roboto/Roboto-Light.ttf
          weight: 300
        - asset: fonts/Roboto/Roboto-Regular.ttf
          weight: 400
        - asset: fonts/Roboto/Roboto-Medium.ttf
          weight: 500
        - asset: fonts/Roboto/Roboto-Bold.ttf
          weight: 700
        - asset: fonts/Roboto/Roboto-Black.ttf
          weight: 900

Directory structure
.
├── pubspec.yaml
└── fonts
    └── Roboto
        ├── LICENSE.txt
        ├── Roboto-Black.ttf
        ├── Roboto-Bold.ttf
        ├── Roboto-Light.ttf
        ├── Roboto-Medium.ttf
        ├── Roboto-Regular.ttf
        └── Roboto-Thin.ttf