我想要製作一個包含翻譯功能的APP，上網爬文後找到可以利用google translate API來達到翻譯的效果，使用以下程式碼在Activity中可以正常執行，想請問若是想在fragment中執行的話要如何修改呢?

程式碼來源

class MainActivity : AppCompatActivity() {

private var translate: Translate? = null

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

    translateButton.setOnClickListener {
        if (checkInternetConnection()) {

            //If there is internet connection, get translate service and start translation:
            getTranslateService()
            translate()

        } else {

            //If not, display "no connection" warning:
            translatedTv!!.text = resources.getString(R.string.no_connection)
        }
    }
}

private fun getTranslateService() {

    val policy = StrictMode.ThreadPolicy.Builder().permitAll().build()
    StrictMode.setThreadPolicy(policy)

    try {
        resources.openRawResource(R.raw.credentials).use { `is` ->
            val myCredentials = GoogleCredentials.fromStream(`is`)
            val translateOptions = TranslateOptions.newBuilder().setCredentials(myCredentials).build()
            translate = translateOptions.service
        }
    } catch (ioe: IOException) {
        ioe.printStackTrace()

    }

}

private fun translate() {

    //Get input text to be translated:
    val originalText: String = inputToTranslate!!.text.toString()
    val translation = translate!!.translate(originalText, Translate.TranslateOption.targetLanguage("tr"), Translate.TranslateOption.model("base"))

    //Translated text and original text are set to TextViews:
    translatedTv!!.text = translation.translatedText

}

private fun checkInternetConnection(): Boolean {

    //Check internet connection:
    val connectivityManager = this.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
    val activeNetwork: NetworkInfo? = connectivityManager.activeNetworkInfo

    //Means that we are connected to a network (mobile or wi-fi)
    return activeNetwork?.isConnected == true

}

}