April 20, Following a number of questions, I decided to provide a full solution, in the FAQ section. Follow this link to get direct access to the solution. I received some questions and remarks from readers who faced issues in implementing the initial solution I described in the first version of the article. I therefore decided to update this article and provide a second solution which should solve all those issues.

The initial article is still relevant, however, the second solution is much easier to implement. Click here to directly jump to this second solution. Internationalization has already been explained several times and the Flutter official documentation on this topic may be found here.

Flutter natively supports localization notion of Locale. One of the properties of this class defines the languageCode. To do so, you will have to add it as a dependency to your pubspec.

When saving the pubspec. I will use the same principle in this article. In order to do this, you will have to edit the pubspec. The initial content of the translations. OK, now that we know how to define the languages, the translations and use the translations, how can we let the user change the working language?

In order to do this, we need to way to force the refresh of the whole application layout when the user selects another working language. Therefore, we need to application to handle a setState. This is a self-initializing class. Each time it will be imported in the source code, the very same instance of the class will be returned.

flutter localization package

Now we need to apply some changes to the Translations. To force another working language, one single line of code is necessary, anywhere in the source code of the application:. Thanks to the Global applic instance, we can make a call to the Main application method onLocaleChange Locale localewhich will create a new instance of the Delegate, which in turn will force a new instance of the Translations class, with the new language.

This solution is based on the notion of Singleton and does no longer relies on the context. This simplifies things a lot. Dependencies that were listed in the section External dependencies remain valid. The following piece of code illustrates a way of using the module explanation will follow the source code ….

The sole objective of this article is to share a solution that works for me, which I hope could also help others. In a next article, I will detail a dedicated Widget to select working languages, which will complement this article.

Internationalization - Make an Flutter application multi-lingual Blog. Difficulty: Intermediate Full solution available 28 Mar Following a number of questions, I decided to provide a full solution, in the FAQ section. Breaking change 19 Oct I received some questions and remarks from readers who faced issues in implementing the initial solution I described in the first version of the article.Let's face it.

Contrary to frameworks like native Android, Flutter doesn't have an absolutely set way of how localization is done. It gives you a lot of freedom which can be good if you know what you're doing, but also extremely confusing if you're just starting out.

In this tutorial, you're going to learn how to localize your apps the simple way by using JSON files to store your strings in multiple languages. Before writing Dart code to access the JSON files containing translated strings, you actually need to create the files first and update the pubspec file. This folder will hold all of the language files.

Localization requires a dependency which comes directly from the Flutter SDK. Also, since you've just added new language JSON files, you need to specify them as assets in order to access them in code. Setup of the localization happens inside the MaterialApp widget, which is the root of a Flutter app.

Here you specify which languages are supported and what happens if the current language of a device is not supported. You also initialize localization objects more on them later here.

flutter localization package

Apart from using AppLocalizations which you haven't yet created, you also specify some predefined material and widgets localizations. Many widgets from the material package contain some text. For example, a material alert dialog can contain a "cancel" button. This button is there by default, you don't need to write the text yourself. Flutter has these kinds of standard strings already localized, all you need to do is to specify the delegate.

Similar to how there are GlobalMaterialLocalizationsyou want to have localizations specific to your app, hence the class name AppLocalizations. Its most important method will be translate.

You can then call method throughout your UI widgets to specify localized strings. The class above is where the actual logic is located. Flutter localization uses delegates for this initialization. Its private, because you don't need to instantiate it inside any other file. Instead, to access this delegate, make a new static field on AppLocalizations class.

Once you have all of this setup done, how do you actually use this translating contraption? It's simple! With this approach, translating your Flutter apps will go like a breeze. Matt is an app developer with a knack for teaching others. I actually recently discovered a very cool way of translating apps. How can i acces AppLocalization iniside a Bloc without a context?

For showing a translated Toast for example? Thank you very much for this simple yet effective way to localize an application! Is there an easy way using your solution to translate the error texts in a TextFormField validator?Localization in Flutter is like any other thing, a Widget. Start by adding this to the dependencies in your pubspec. The first one says our package needs the localization Flutter package to run, and the second give us the tools to generate dart code with the messages from.

The common way of doing this is creating a class that have all the localization helpers to using in the whole app, like an AppLocalizations that would be very similar from app to app, except by the string resources. Below the example:.

This AppLocalizations class will have four main pieces:. This is the true Localization class from our app, AppLocalizations is used to encapsulates the resources and AppLocalizationsDelegate to provide this resources to our app. It can be divided in three main pieces:. The final step is to create the string translations.

The translations are made using Application Resource Bundle files, which have a. This format is also supported by the Google Translators Toolkit. To start, we run this dart intl tool command to generate an arb template.

Note 1 : The output-dir must exist before running the command. Note 2 : The last parameter is the file that contains the Intl.

flutter localization package

With the translations ready, we are going to link the initializeMessages as I said in the first step. This is made with the follow command:. You can see that all the necessary files were generate. To finalize the localization, we have to say to our app to use the AppLocalizationsDelegate class as the app localization class. The elements of the localizationsDelegates list are factories that produce collections of localized values.

Personally, this localization method is a little bit complicated and also boring for who knows the android native system. But I think this will improve with time. You can check the Flutter Intl vs-code plugin that makes a lot of the hand work for you and makes the process easier.

Also you can check the flutter. Sign in.Quisque actraqum nunc no dolor sit ametaugue dolor. Lorem ipsum dolor sit amet, consyect etur adipiscing elit. Having one codebase for Android and iOS app sounds attractive. However, if you build an app for different markets, you will most likely need to support multiple languages for your end-users. Flutter has good documentation on how to get started with a sample app, so we will not go into that here.

We will describe how to introduce localization to your sample app. Start by defining these localization dependencies in your pubspec. Install packages by running following command from Terminal:. At the end of AppLocalizations class we define all string keys we will use inside our app. AppLocalizationsDelegate class has a list of supportedLocales.

We should put all locales we support for end-users into that list. Now, that we have defined 2 string keys in AppLocalizations class, we can simply use them in our widgets. In the following example, we use them to print the title on the top of the app page, and a simple welcome message with a placeholder.

When you want programmatically to change the current locale in your app, you can do it in the following way:. The code is now ready, but we miss localization files for languages we support.

That arb file contains all key-value pairs we use in our Widgets. Easy to manage a couple of strings in two languages? But as you add more features and expand to more markets, your app will grow to thousands of strings in a dozen of languages.

Give your project a name and set your main and other languages. You can change the main language later if needed. Go to Upload page, select the file, and confirm. Alternatively, you can start by adding string keys in Localizely first.

Localization work is a team effort. Switch to the Contributors section by clicking the icon in the side menu and start adding teammates. Any user can be granted admin privileges, i.

For non-admin contributors, you can specify per-language access to the project specifying some languages as reference read-only or contributable read and update. Only admins have access to string key changes, importing, exporting, settings, etc.

Localizely has an editor on Translations page that reminds of Excel tables commonly used for translations management. Feel free to explore the Sample project or just take a look at Getting started guide to grasp the basic concept and options.

The translation part is done. How to get the localization data out of Localizely and make it usable in your Flutter app? Contact Info. Follow Us. November 2, By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

I am new in Flutter localization. I am trying to inplement it in my flutter IOS app but I am getting the below error:. The method 'translate' was called on null. Receiver: null Tried calling: translate "menu". I hope someone can me with with this - I am been trying for hours but can't sole the issue - Hope you can help. Learn more. Flutter localization Ask Question.

Flutter — Localization: step by step

Asked 1 month ago. Active 1 month ago. Viewed 48 times. I am trying to inplement it in my flutter IOS app but I am getting the below error: The method 'translate' was called on null. Active Oldest Votes.

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Feedback on Q2 Community Roadmap. Technical site integration observational experiment live on Stack Overflow. Dark Mode Beta - help us root out low-contrast and un-converted bits. Related Hot Network Questions. Question feed. Stack Overflow works best with JavaScript enabled.Usually when developing apps for Middle East and North Africa, it requires to open in Arabic regardless of the device language.

With option to change the language from the app to English or keep the Arabic version. By default Flutter only provides US English localization. Localization Delegates. The elements of the localizationsDelegates list are factories that produce collections of localized values.

Finally, simple TextFormField widget to test the localization and direction. Finally, you can grab the full source code.

Base project that you can get and start directlly. Sign in. Submit Archive About Events droidcon. Mohammad Saeed Follow. What will we build? Convert the root widget of the application to Stateful widget.

Flutter Tips: Localization in 3 Steps (Multi Language Support)

That will cause rebuild based on the locale and direction we specify. Using Scope Model to save the used local, change it when requied and update all childs to use the new locale. Localization Delegates The elements of the localizationsDelegates list are factories that produce collections of localized values. More than 28 million people use GitHub to discover, fork, and contribute to over….

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Util now, there is an error i found. In case, you select a language like Hindi, then Click a field to input text, the language will be changed to English automatically. Can you fix it? Can you explain more detail about the way that I dont have to change device setting. I mean I only manipulate with the application's setting.

Thanks in advance!!! I had same above problem. Here is what you should do. Save your language code inside a shared preference or db. Privacy Policy Disclaimer.

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So, we need to support multiple languages in our application. In mobile, with the help of localization, you can change the language of application labels and we can render the content of the app into other languages. We can customize the app for each target market and user. Hai April 18, at PM.

flutter localization package

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