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Localization

Creating New Locale Messages

When adding new strings to be localized, update intl_en.arb, which is used by this project as the template. When creating new entries, they have to be in the following format:

  "dartGetterVariableName": "english translation of the message",
  "@dartGetterVariableName": {
    "description": "description that the localizations delegate will use."
  },

In this example, dartGetterVariableName should be the Dart method/property name that you will be using in your localizations delegate.

After adding the new message in intl_en.arb, it can be used in the app by regenerating the GalleryLocalizations delegate. This allows use of the English message through your localizations delegate in the application code immediately without having to wait for the translations to be completed.

Generating GalleryLocalizations

Note that using grinder is simplest and that, under the hood, it runs the l10n scripts.

With Grinder

  1. Make sure you have grinder installed by running flutter pub get.
  2. Then run flutter pub run grinder l10n to generate GalleryLocalizations.

For more details on what flutter pub run grinder l10n does, see the next section With l10n scripts.

With l10n scripts

From the root directory, run:

dart ${YOUR_FLUTTER_PATH}/dev/tools/localization/bin/gen_l10n.dart \
    --template-arb-file=intl_en.arb \
    --output-localization-file=gallery_localizations.dart \
    --output-class=GalleryLocalizations

From the root directory, run dart tool/l10n_cli/main.dart, which will generate intl_en_US.xml. This will be used by the internal translation console to generate messages in the different locales.

Note that the filename for intl_en_US.xml is used by the internal translation console and changing the filename may require manually updating already translated messages to point to the new file. Therefore, avoid doing so unless necessary.

Run the formatter to make the Flutter analyzer happy:

flutter format .

Importing translations (for Flutter org members)

Once the translations are ready:

  1. Use the internal tool (push_l10n) to push the updated intl_<locale>.arb files to this repo. For more information, see /third_party/dart/flutter_gallery/README.md
  2. Generate GalleryLocalizations with the updated .arb files by running flutter pub run grinder l10n.