KViewTranslator.kt

package com.kekyazilim.annotationreflectionexample.translator.kotlin

import android.app.Activity
import android.widget.TextView
import com.kekyazilim.annotationreflectionexample.translator.fakes.FakeTranslatorJson
import java.util.*


object KViewTranslator {

    fun bindAndTranslate(target: Activity) {

        val language = Locale.getDefault().language
        val fakeJson = FakeTranslatorJson().getLanguageJsonObject()

        for (field in target.javaClass.declaredFields) {
            val currentAnnotation = field.getAnnotation(KBindTranslateView::class.java)
            currentAnnotation?.let {
                val translatedMessage = fakeJson
                    .getJSONObject(currentAnnotation.key)
                    .getString(language)

                field.set(target, target.findViewById(currentAnnotation.value))
                if (TextView::class.java.isAssignableFrom(field.type))
                    (target.findViewById(currentAnnotation.value) as TextView)
                        .text = translatedMessage
            }
        }
    }
}