fast_i18n #

Lightweight i18n solution. Use JSON files to create typesafe translations.

Getting Started #

Step 1: Add dependencies #

dependencies:
  fast_i18n: ^1.1.2

dev_dependencies:
  build_runner: any

Step 2: Create JSON files #

Create these files inside your lib directory. Preferably in one common package like lib/i18n.

strings.i18n.json

{
  "hello": "Hello $name",
  "save": "Save",
  "login": {
    "success": "Logged in successfully",
    "fail": "Logged in failed"
  }
}

strings_de.i18n.json

{
  "hello": "Hallo $name",
  "save": "Speichern",
  "login": {
    "success": "Login erfolgreich",
    "fail": "Login fehlgeschlagen"
  }
}

Step 3: Generate the dart code #

flutter packages pub run build_runner build

Step 4: Initialize #

Widget build(BuildContext context) {                                    

    // a: use device locale (StatefulWidget for rerendering)
    LocaleSettings.useDeviceLocale().then((_) {
      setState((){});
    });
 
    // b: use specific locale
    LocaleSettings.setLocale('de');
 
    // c: use default locale
    // *do nothing*

    return MaterialApp(
      // [...]
    );

Step 5: Use your translations #

// raw string
String translated = t.hello(name: 'Tom');

// inside component
Text(t.login.success)

API #

When the dart code has been generated, you will see some useful classes and functions

t - the most important translate variable

LocaleSettings.useDeviceLocale() - use the locale of the device

LocaleSettings.setLocale('de') - change the locale

LocaleSettings.currentLocale - get the current locale

License #

MIT License

Copyright (c) 2020 Tien Do Nam

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.