Create your start screen

To create the screens displayed by your app, you define the classes that extend the Screen class and implement its onGetTemplate method to return the Template instance that represents the state of the UI to display in the car screen.

This code snippet shows how to declare a Screen that uses a PaneTemplate template to display a "Hello world!" string:

class MyStartScreen(carContext: CarContext) : Screen(carContext) {
    override fun onGetTemplate(): Template {
        val row = Row.Builder().setTitle("Hello world!").build()
        val pane = Pane.Builder().addRow(row).build()
        val header = Header.Builder()
            .setStartHeaderAction(Action.APP_ICON)
            .build()
        return PaneTemplate.Builder(pane)
            .setHeader(header)
            .build()
    }
}

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Create your CarAppService and session
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Implement screen navigation