您的resources对象没有初始化，因此您应该在类构造函数或方法中获取它
类内构造函数

class Utils(private val resources: Resources) {

    fun getAsiaCountriesFlags(): MutableList<Flag> {
        ...
    }
}

方法中

class Utils {

    fun getAsiaCountriesFlags(resources: Resources): MutableList<Flag> {
        ...
    }
}

**Before** 
<string-array name="country_array">

    <item>asia_armenia</item>
    <item>asia_iran</item>
    <item>asia_turkey</item>
    <item>asia_azerbaijan</item>
    <item>asia_turkey</item>

    </string-array>
**Create res--> Array.xml**
**After**
  var categories: Array<String?>
        categories=getResources().getStringArray(R.array.vehiclescategory_array);

考虑以下情况：
私有var资源：资源？= null
private瓦尔utils = resources？：”“你说什么？”

class Utils(private val context: Context) {

// NOT NEEDED
//private var resources: Resources? = null

// Create Utils class by passing context and
// it'll Lazily initialized utils variable on first call/access
private val utils by lazy { context.resources }

fun getAsiaCountriesFlags(): MutableList<Flag> {
    return mutableListOf(
        Flag(
            R.drawable.asia_turkey,
            listOf(
                utils.getString(R.string.asia_armenia),
                utils.getString(R.string.asia_iran),
                utils.getString(R.string.asia_turkey),
                utils.getString(R.string.asia_azerbaijan)
            ),
            utils.getString(R.string.asia_turkey)
        )
    )
}
}