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Code Issues Releases Wiki Activity

Update to Dart 2.12 (#591)

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Michael Thomsen
2020-11-17 17:16:04 +01:00
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commit 1091fb1f33
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experimental/null_safety/README.md
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@@ -27,53 +27,8 @@ The folder contains two sample Flutter apps:
## Running the example code
Null safety is still in technical preview. As a result you need to use a
dev-channel Flutter build, and you have to pass an [experiment
flag](https://dart.dev/tools/experiment-flags).
### Flutter SDK requirements
This sample is
[experimental](https://github.com/flutter/samples/tree/master/experimental), and
requires using a **dev channel** Flutter SDK. You can change to the dev channel
with `flutter channel dev` followed by `flutter upgrade` (don't forget to change
back to `flutter channel stable` for production use.
### Running from the terminal/command-prompt
Because null safety is still in tech preview, we need to pass a so-called
_experiment flag_ when invoking any Flutter command in the terminal, which looks
like this: `--enable-experiment=non-nullable`.
To run the main app, type these commands in the terminal/command-prompt:
- Windows:
- `cd <folder with samples repo>\experimental\null_safety\null_safe_app\`
- `flutter pub get`
- `flutter run --enable-experiment=non-nullable`
- macOS/Linux:
- `cd <folder with samples repo>/experimental/null_safety/null_safe_app/`
- `flutter pub get`
- `flutter run --enable-experiment=non-nullable`
### Running from VSCode
This example contains a launch configuration for VSCode that passes the
experimental flag, so to run the sample in VSCode:
1. Invoke **File > Open**, and select the `null_safety/null_safe_app` folder.
1. Select **Run > Run** and the project should run and print a message in the
Debug Console.
### Running from Android Studio
1. Start Android Studio.
1. Select Open Project, and select the `null_safety/null_safe_app` folder.
1. Open the file `lib/main.dart` in the code editor.
1. Select Run > Run and the project should run and print a message in the Run
pane.
requires using a **beta channel** Flutter SDK. You can change to the beta
channel with `flutter channel beta` followed by `flutter upgrade` (don't forget
to change back to `flutter channel stable` for production use.