静态方法如何在Kotlin项目中实现

package redwolf.com.moreimageupload

import okhttp3.MultipartBody
import java.io.File

/**
 * @作者 RedWolf
 * @时间 2017/5/20 10:52
 * @简介 MoreImageUtils.kt
 */

object MoreImageUtils {
  fun filesToMultipartBodyParts(files: List): List&＃63; {
    return null;
  }
}

package redwolf.com.moreimageupload

import android.os.Bundle
import android.support.v7.app.AppCompatActivity

class Main2Activity : AppCompatActivity() {

  override fun onCreate(savedInstanceState: Bundle&＃63;) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main2)
  }

  companion object {

    fun getStatic() {

    }

    fun getStaticString(string: String): String&＃63; {
      return null
    }
  }
}