Kotlin unresolved reference :add after converting from Java code

Kotlin unresolved reference :add after converting from Java code

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Kotlin unresolved reference :add after converting from Java code
Tag : java , By : Vodkat
Date : November 29 2020, 03:01 PM

around this issue Since you'r assigning a List<> to your valuesList it doesnt know add().
Change it to
 fun <KEY, VALUE> createMultimap(values: Collection<VALUE>, transformFunction: TransformFunction<VALUE, KEY>): Map<KEY, ArrayList<VALUE>> {
 var valuesList: ArrayList<VALUE>? = tmpMap[key]
 fun <KEY, VALUE> createMultimap(values: Collection<VALUE>, transformFunction: TransformFunction<VALUE, KEY>): Map<KEY, MutableList<VALUE>> {
    val tmpMap = HashMap<KEY, MutableList<VALUE>>()
    for (value in values) {
        if (value != null) {
            val key = transformFunction.transform(value)
            var valuesList: MutableList<VALUE>? = tmpMap[key]
            if (valuesList == null) {
                valuesList = mutableListOf()
                tmpMap.put(key, valuesList)

    return Collections.unmodifiableMap(tmpMap)

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Mixed Kotlin + Java with Maven, unresolved reference

Tag : java , By : John Bentley
Date : March 29 2020, 07:55 AM
it fixes the issue The compilation fails because your Java class is not in a directory that matches its package statement. While Kotlin allows you to put classes in any directories regardless of the package they're in, Java requires you to put each file in a package that corresponds to its directory. This requirement applies to mixed-language projects as well.
To fix the error, move JavaFoo.java to src/main/java/com/example/kotlindemo.

Got Unresolved reference: setText when convert java to kotlin

Tag : java , By : Nick Pegg
Date : March 29 2020, 07:55 AM
will be helpful for those in need I want to use Android Studio to convert a android app demo from java to kotlin. But I got some Errors.
(private val context: Context, statusText: TextView) : AsyncTask<Void, Void, String>() {
    private val isname = true
    private val name = "啦啦啦"
    private val statusText: TextView
    internal var myhandler: Handler = object : Handler() {
        override fun handleMessage(msg: Message) {
            when (msg.what) {
                10 -> statusText.text = "XXXXXX"

    init {
        this.statusText = statusText as TextView

    override fun doInBackground(vararg params: Void): String? {
        return null

Unresolved reference when referencing Java code from Kotlin tests in Spring Boot project using Gradle

Tag : java , By : redha
Date : March 29 2020, 07:55 AM
it should still fix some issue It turns out the problem was that I had some .java classes inside src/main/kotlin package. Once I moved these under src/main/java package the problem was resolved.

New kotlin files in old java project - 'Unresolved reference' R

Tag : android , By : Lucas Thompson
Date : March 29 2020, 07:55 AM
seems to work fine In AS Preferences, under General -> Auto Import, i enabled the following.
This imports R automatically now.

Unresolved reference error in Kotlin files in a Java+Kotlin Android project

Tag : java , By : taviso
Date : March 29 2020, 07:55 AM
Hope this helps I was able to find a solution for this.
Turns out, (and I don't know the reason why), but after upgrading the Gradle version and Kotlin plugin, the older version of a library was causing some kind of interference. I updated
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