I'm new using Kotlin and I have to develop an app for Android Auto. I just did write a code for creating the first Hello World screen but now I wanna add a button for navigate to another screen. The problem is that I did this in Java like the code below but I don't know how to write this arrow function (setOnClickListener(() -> getScreenManager().push(new SecondScreen(getCarContext())))) in Kontlin

This is the code in Java:

public Template onGetTemplate() {
        //Row row = new Row.Builder().setTitle("Hello world").addText("Example").build();
        MessageTemplate template = new MessageTemplate.Builder("Hello world!").setTitle("Hello")
                .addAction(
                        new Action.Builder()
                                .setTitle("Next screen")
                                .setOnClickListener(
                                        () -> getScreenManager().push(new SecondScreen(getCarContext())))
                                .build())
                .build();
        return template;
    }

I have tried with this: 1)

MessageTemplate.Builder("Hello world!").setTitle("Hello")
            .addAction(
                Action.Builder()
                    .setTitle("Next screen")
                    .setOnClickListener(
                        () -> getScreenManager().push(SecondScreen(getCarContext()))).build()).build()

And this: 2)

MessageTemplate.Builder("Hello world!").setTitle("Hello")
            .addAction(
                Action.Builder()
                    .setTitle("Next screen")
                    .setOnClickListener(
                        {() -> getScreenManager().push(SecondScreen(getCarContext()))}).build()).build()

But I only received these results:

1. Expecting an expression

2. Expecting a name, Type mismatch: inferred type is (Any?) -> Unit but () -> Unit was expected, Expected no parameters

CodePudding user response：

Did you have tried this?

val template: MessageTemplate = Builder("Hello world!").setTitle("Hello")
            .addAction(
                Builder()
                    .setTitle("Next screen")
                    .setOnClickListener { getScreenManager().push(SecondScreen(getCarContext())) }
                    .build()
            )
            .build()