I can't use MediaType when I create MultipartFile

[MateusLucasDaSilva]

Package

dio

Version

5.4.3+1

Operating-System

Android, iOS, Web, MacOS, Linux, Windows

Adapter

Default Dio

Output of flutter doctor -v

!] Flutter (Channel stable, 3.19.0, on macOS 14.4.1 23E224 darwin-arm64, locale pt-BR)
    • Flutter version 3.19.0 on channel stable at /Users/usuario/fvm/versions/3.19.0
    ! Warning: `dart` on your path resolves to /opt/homebrew/Cellar/dart/3.2.0/libexec/bin/dart, which is not inside your current Flutter SDK checkout at /Users/usuario/fvm/versions/3.19.0. Consider adding /Users/usuario/fvm/versions/3.19.0/bin to the front of your path.
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision bae5e49bc2 (3 months ago), 2024-02-13 17:46:18 -0800
    • Engine revision 04817c99c9
    • Dart version 3.3.0
    • DevTools version 2.31.1
    • If those were intentional, you can disregard the above warnings; however it is recommended to use "git" directly to perform update checks and upgrades.

[✓] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
    • Android SDK at /Users/usuario/Library/Android/sdk
    • Platform android-34, build-tools 34.0.0
    • ANDROID_HOME = /Users/usuario/Library/Android/sdk
    • Java binary at: /Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 17.0.6+0-17.0.6b829.9-10027231)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 15.3)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Build 15E204a
    • CocoaPods version 1.15.2

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2022.3)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 17.0.6+0-17.0.6b829.9-10027231)

[✓] VS Code (version 1.87.2)
    • VS Code at /Users/usuario/apps/Visual Studio Code.app/Contents
    • Flutter extension version 3.89.20240501

Dart Version

No response

Steps to Reproduce

When using MultipartFile.fromFile does it ask for a contentType parameter that is of type MediaType? but I can't pass the parameter because it is an http_parser parameter but dio does not export the http_parser

Expected Result

Future<FormData?> _convertForFormDataDio(
GenericFormData genericFormData) async {
final FormData formData = FormData();

for (String mediaPath in genericFormData.filePaths) {
  formData.files.add(
    MapEntry<String, MultipartFile>(
      'files',
      await MultipartFile.fromFile(
        mediaPath,
        filename: path.basename(mediaPath),
        contentType: MediaType.parse('.png') ,
        headers: <String, List<String>>{
          'Content-Type': <String>['multipart/form-data'],
        },
      ),
    ),
  );
}

for (String key in genericFormData.fields.keys) {
  formData.fields.add(MapEntry<String, String>(
      key, genericFormData.fields[key].toString()));
}

return formData;

}

Actual Result

Future<FormData?> _convertForFormDataDio(
GenericFormData genericFormData) async {
final FormData formData = FormData();

for (String mediaPath in genericFormData.filePaths) {
  formData.files.add(
    MapEntry<String, MultipartFile>(
      'files',
      await MultipartFile.fromFile(
        mediaPath,
        filename: path.basename(mediaPath),
        contentType: MediaType.parse('.png') ,//Undefined name 'MediaType'. Try correcting the name to one that is defined, or defining the name.
        headers: <String, List<String>>{
          'Content-Type': <String>['multipart/form-data'],
        },
      ),
    ),
  );
}

for (String key in genericFormData.fields.keys) {
  formData.fields.add(MapEntry<String, String>(
      key, genericFormData.fields[key].toString()));
}

return formData;

}

[kuhnroyal]

See #2205 for previous discussion.
@cfug/devs Do we want to revisit this decision?