Flutter lower dart version

问题

I'm getting the following error due to Dart version of my flutter setup when I run the flutter get packages command:

[project_name] flutter packages get Running "flutter packages get" in project_name...
The current Dart SDK version is 2.1.0-dev.0.0.flutter-be6309690f.

Because project depends on intl_translation >=0.14.0+1 <0.17.0 which requires SDK version >=1.12.0 <2.0.0, version solving failed. pub get failed (1) exit code 1

My framework version:

Flutter 0.6.0 • channel beta • https://github.com/flutter/flutter.git
Framework • revision 9299c02cf7 (2 weeks ago) • 2018-08-16 00:35:12 +0200
Engine • revision e3687f70c7
Tools • Dart 2.1.0-dev.0.0.flutter-be6309690f

I would like to learn if there's some kind of command to lower dart-sdk version of the flutter framework, thanks in advance.

回答1:

In the Flutter install directory execute

git checkout v"0.5.0" // for example

You can check which versions are available in the Flutter GitHub repository https://github.com/flutter/flutter

回答2:

You can only change the Dart version if you change to a Flutter version that contains the desired Dart version.

Change the dependency to

dev_dependencies:
  intl_translations: ^0.17.0

回答3:

Add following dependency in pubspec.yaml file

version: 1.0.0+1

environment:
  sdk: ">=2.0.0-dev.68.0 <3.0.0"

来源：https://stackoverflow.com/questions/52102360/flutter-lower-dart-version