Using Vue.js and Kotlin language to implement international support for mobile applications

Use Vue.js and Kotlin language to implement international support for mobile applications

With the global development of mobile applications, in order to attract more international users, internationalization has become an issue that cannot be ignored . In this article, we will introduce how to use Vue.js and Kotlin language to implement international support for mobile applications.

1. Internationalization support of Vue.js
   Vue.js is a front-end development framework with strong internationalization support. It provides a component-based translation mechanism that allows developers to easily switch applications to multiple languages.

First, we need to install Vue’s internationalization plug-in vue-i18n. You can use npm or yarn to install:

npm install vue-i18n

or

yarn add vue-i18n

After the installation is complete, we can introduce and use vue-i18n in the Vue entry file:

import Vue from 'vue'
import VueI18n from 'vue-i18n'

Vue.use(VueI18n)

const i18n = new VueI18n({
  locale: 'en', // 默认的语言环境
  messages: {
    'en': require('./locales/en.json'), // 英文语言包
    'zh': require('./locales/zh.json') // 中文语言包
  }
})

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

in In the above code, we created an i18n object through the VueI18n plug-in and specified the default locale as English. At the same time, we also introduced all language pack files in the application.

Next, in components that require multi-language switching, we can implement text internationalization through this.$t method:

<template>
  <div>
    <p>{{ $t('hello') }}</p>
  </div>
</template>

<script>
export default {
  data() {
    return {}
  },
  methods: {},
}
</script>

In the above code, we use { {$t('hello')}} to get the translation result of the text named hello. When switching languages, Vue-i18n will automatically select the corresponding translation result according to the current language environment.

2. Kotlin’s internationalization support
   For mobile applications, front-end internationalization only solves part of the problem, and mobile localization support is equally important. In Android development, we can use the Kotlin language to implement internationalization of mobile applications.

First, create different values ​​folders in the res directory of the project to store string resources in different locales. For example, create values-en and values-zh folders to store English and Chinese resources respectively.

Next, create the strings.xml file in the corresponding values ​​folder and put the string resources that need to be internationalized into it. For example:

<resources>
    <string name="app_name">My App</string>
    <string name="hello">Hello World</string>
</resources>

In the code, we can get the translation result of the resource through the getString method:

val appName = getString(R.string.app_name)
val hello = getString(R.string.hello)

In the above code, we pass R.string.app_name and R.string.hello to obtain the translation results of the corresponding resources. At runtime, the Android system will automatically select the resources in the corresponding values ​​folder based on the current locale.

3. Combining Vue.js and Kotlin to achieve international support for mobile applications
   In order to achieve complete internationalization of mobile applications, we can combine Vue.js and Kotlin. The specific operations are as follows:

First, we need to integrate the Vue.js framework into the Kotlin project. Add the following dependencies in the project's build.gradle file:

implementation 'androidx.webkit:webkit:1.3.0'
implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.5.0'
implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.5.0'
implementation 'androidx.lifecycle:lifecycle-runtime-ktx:2.3.1'
implementation 'androidx.compose.ui:ui:1.0.0'
implementation 'androidx.compose.material:material:1.0.0'
implementation 'com.github.kittinunf.fuel:fuel-androidx:2.5.0'
implementation 'com.squareup.okio:okio:2.10.0'
implementation 'org.jsoup:jsoup:1.14.2'
implementation 'nl.psdcompany:pomeloclient:2.0.0'
implementation 'androidx.multidex:multidex:2.0.1'
implementation 'androidx.appcompat:appcompat:1.3.1'

Then, create a WebView in the Kotlin project to load the Vue.js project. Add the following code to the MainActivity.kt file:

class MainActivity : AppCompatActivity() {
    private lateinit var webView: WebView

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        webView = findViewById(R.id.web_view)

        val webSettings = webView.settings
        webSettings.javaScriptEnabled = true
        webSettings.domStorageEnabled = true

        webView.webViewClient = object : WebViewClient() {
            override fun onPageFinished(view: WebView, url: String) {
                super.onPageFinished(view, url)
                // 在页面加载完成后，向Vue.js传递当前的语言环境
                webView.loadUrl("javascript:setLanguage('${getLanguage()}')")
            }
        }

        webView.loadUrl("file:///android_asset/index.html")
    }

    // 获取当前的语言环境
    private fun getLanguage(): String {
        val systemLocale = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            resources.configuration.locales[0]
        } else {
            resources.configuration.locale
        }

        return when (systemLocale.language) {
            "zh" -> "zh"
            else -> "en"
        }
    }
}

In the above code, we create a WebView and set its related properties. After the page is loaded, the current locale is passed to Vue.js using the webView.loadUrl method.

In the Vue.js project, we need to display the corresponding interface according to the passed locale. In the entry file of Vue.js, we can do this:

import Vue from 'vue'
import VueI18n from 'vue-i18n'

Vue.use(VueI18n)

const i18n = new VueI18n({
  locale: getLanguage(), // 接收传递过来的语言环境
  messages: {
    'en': require('./locales/en.json'), // 英文语言包
    'zh': require('./locales/zh.json') // 中文语言包
  }
})

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

// 获取传递过来的语言环境
function getLanguage() {
  return window.android.getLanguage()
}

In the above code, we added a getLanguage method in the entry file of Vue and get the pass through window.android.getLanguage() Come over locale.

In summary, it is very feasible to use Vue.js and Kotlin language to achieve international support for mobile applications. Through the internationalization plug-in of Vue.js and the multi-language support of Kotlin, we can easily implement multi-language switching of the application. At the same time, by combining Vue.js and Kotlin, we can achieve complete support for the front-end and localization of mobile applications to meet the needs of users in different countries and regions.

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