Android 从 Kotlin 调用非静态 Java 方法

Question

I am trying to call a non-static Java method from a Kotlin file as I need to be able to use findViewById. However When I changed my method to non-static the Kotlin file returned the following error: Unresolved reference: main. When the Java method was static the Kotlin file was able to run the Java method.

Kotlin File:

class RoundFactoryImpl(private val randomiser: Randomiser) : RoundFactory {
     override fun buildRound(cards: List<Card>): Round = Round()
     val card = Round()
     val customer = PokemonRand.main(randomiser, card)
}

Java File:

public void main(Randomiser randomiser, Round cards) {
    Card cardA, cardB;

    cardA = getCard(randomiser, cards);
    cardB = getCard(randomiser, cards);

    Log.d("cardA", cardA.toString());
    Log.d("cardB", cardB.toString());

    while (cardA.getRarity() == cardB.getRarity()) {
        cardB = getCard(randomiser, cards);
    }

    dispCard(cardA, cardB);
    compCard(cardA, cardB);
}

Answer 1

val customer = PokemonRand.main(randomiser, card)

First issue with your code is you are assigning the value of your main method to customer variable whose return type is void ;

Second problem with the code is your main method is not static so you need to create an instance of the PokemonRand class and call the main method on that instance like the following

val pokemon = PokemonRand();
pokemon.main(randomiser, card);