tldr/pages/common/flutter.md

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# flutter
> Google's free, open source, and cross-platform mobile app SDK.
> More information: <https://github.com/flutter/flutter/wiki/The-flutter-tool>.
- Display help about a specific command:
`flutter help {{command}}`
- Check if all external tools are correctly installed:
`flutter doctor`
- List or change Flutter channel:
`flutter channel {{stable|beta|dev|master}}`
- Run Flutter on all started emulators and connected devices:
`flutter run -d all`
- Download all packages specified in `pubspec.yaml`:
`flutter pub get`
- Run tests in a terminal from the root of the project:
`flutter test {{test/example_test.dart}}`
- Build a release APK targeting most modern smartphones:
`flutter build apk --target-platform {{android-arm}} {{android-arm64}}`