[cross_file] Document that mimeType is not expected to be set for io implementation #93379
Description
Steps to Reproduce
- Run the image picker example on a physical android device
- Add a line in
_onImageButtonPressedtoprint(pickedFile?.mimeType) - Pick an image
Expected results:
'image/jpeg' or something like that
Actual results:
null :'(
Code sample
Reproducible with the official example, testing on a Poco X3.Logs
alex@Alexs-MacBook-Air ~ % flutter doctor -v
[✓] Flutter (Channel stable, 2.5.3, on macOS 12.0.1 21A559 darwin-arm, locale en-GB)
• Flutter version 2.5.3 at /Users/alex/flutter
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision 18116933e7 (4 weeks ago), 2021-10-15 10:46:35 -0700
• Engine revision d3ea636dc5
• Dart version 2.14.4
[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
• Android SDK at /Users/alex/Library/Android/sdk
• Platform android-30, build-tools 30.0.3
• Java binary at: /Applications/Android Studio.app/Contents/jre/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 11.0.10+0-b96-7281165)
• All Android licenses accepted.
[✓] Xcode - develop for iOS and macOS
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 13.1, Build version 13A1030d
• CocoaPods version 1.11.2
[✓] Chrome - develop for the web
• Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome
[✓] Android Studio (version 2020.3)
• 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 11.0.10+0-b96-7281165)
[✓] VS Code (version 1.62.0)
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension version 3.28.0
[✓] Connected device (2 available)
• M2007J20CG (mobile) • d35bf0f1 • android-arm64 • Android 11 (API 30)
• Chrome (web) • chrome • web-javascript • Google Chrome 95.0.4638.69