Guidelines and practical experience in developing internationalization-enabled mobile application solutions using Vue.js and Kotlin languages

Guidelines and practical experiences in developing internationalized mobile application solutions using Vue.js and Kotlin language

Foreword:
With the progress of globalization, the development of internationalized supported mobile applications has Become an essential skill. This article will introduce how to use Vue.js and Kotlin language to develop a multi-language mobile application, and share some practical experience and code examples.

1. Understand the concept of internationalization
Internationalization, referred to as i18n (internationalization), refers to enabling software to adapt to the needs of different regions based on the languages, cultures and habits of different regions and countries. In mobile applications, internationalization often involves language switching, date and time format conversion, currency unit conversion, etc.

2. Front-end framework selection: Vue.js
Vue.js is a simple and efficient JavaScript front-end framework. It is characterized by being easy to learn, easy to expand, and easy to maintain. Vue.js provides multi-language support plug-in vue-i18n, which can easily implement internationalization functions.

Sample code:
First, we need to install the vue-i18n plug-in, which can be installed using npm or yarn:

$ npm install vue-i18n

In the entry file of the Vue project (such as main.js) Introduce the vue-i18n plug-in and add the required language pack:

import Vue from 'vue'
import VueI18n from 'vue-i18n'
import en from './locales/en.json'
import zh from './locales/zh.json'
import App from './App.vue'

Vue.use(VueI18n)

const messages = {
  en: en,
  zh: zh
}

const i18n = new VueI18n({
  locale: 'en',
  messages
})

new Vue({
  el: '#app',
  i18n,
  render: h => h(App)
})

In the above code, we use Vue.use(VueI18n) to register the plug-in after introducing the vue-i18n plug-in. Then, we defined two language packages en and zh, and initialized the VueI18n instance using these two language packages. We set the default language to English and configure it through the locale attribute. Finally, we use the i18n instance to inject into the Vue root instance.

In the App.vue component, we can directly use the instruction $t to get the corresponding translation text, as shown below:

<template>
  <div>
    <h1 id="t-hello">{{$t('hello')}}</h1>
    <p>{{$t('welcome')}}</p>
  </div>
</template>

Among them, hello and welcome are the translation texts we defined in the language pack.

3. Back-end language selection: Kotlin
Kotlin is a modern statically typed programming language that can be used as an alternative to Java. In the back-end development of mobile applications, Kotlin provides many convenient tools and frameworks, such as Ktor, Spring Boot, etc.

Sample code:
In Kotlin, we can use the Ktor framework to handle backend requests and return data.

First, we need to introduce Ktor dependency in build.gradle:

implementation "io.ktor:ktor-server-netty:$ktor_version"
implementation "io.ktor:ktor-jackson:$ktor_version"
implementation "io.ktor:ktor-gson:$ktor_version"

Then, we can write a simple Ktor application and provide internationalization support:

import io.ktor.application.*
import io.ktor.features.ContentNegotiation
import io.ktor.features.StatusPages
import io.ktor.http.HttpStatusCode
import io.ktor.jackson.jackson
import io.ktor.response.respond
import io.ktor.routing.Routing
import io.ktor.routing.get
import io.ktor.routing.routing
import io.ktor.server.engine.embeddedServer
import io.ktor.server.netty.Netty
import io.ktor.util.KtorExperimentalAPI

@KtorExperimentalAPI
fun Application.module() {
    install(ContentNegotiation) {
        jackson { }
    }

    install(StatusPages) {
        exception<Throwable> { cause ->
            call.respond(HttpStatusCode.InternalServerError, cause.localizedMessage)
        }
    }

    routing {
        get("/") {
            val lang = call.request.headers["Accept-Language"]
            val message = when (lang) {
                "zh" -> "你好，世界！"
                else -> "Hello, World!"
            }
            call.respond(mapOf("message" to message))
        }
    }
}

fun main() {
    embeddedServer(Netty, port = 8080, module = Application::module).start(wait = true)
}

In the above code, we have created a simple application using the Ktor framework. We obtain the user's current language settings through the Accept-Language request header, and return the corresponding translated text according to different languages.

Summary:
This article introduces how to use Vue.js and Kotlin language to develop a multi-language mobile application, and gives corresponding code examples. With this solution, we can easily implement international support and provide a better user experience. I hope this article will be helpful to everyone when developing international applications!

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