Convert Java Thread to Kotlin

Question

I try to learn Kotlin by working through the Book "Android Game Programming by Example". Now I can't get any further in creating threads. In Java, a thread is first defined with zero and later delayed with sleep (). Since I'm still a newbe, I can't customize the code to my needs. That's how I found an explanation for threads in Kotlin. But I can't put it into practice. Can someone tell me how to do this using my example? I cut out the code lines for the threads.

public class TDView extends SurfaceView implements Runnable {

//Thread related
volatile boolean playing;
Thread gameThread = null; //Line 29
...
private void control() {
    try {
        gameThread.sleep(17);          //Line 310
    } catch (InterruptedException e) {
        //catch things here
    }
}

public void pause() {
    playing = false;
    try {
        gameThread.join();             //Line 319
    } catch (InterruptedException e) {
        //catch things here
    }
}

public void resume() {
    playing = true;
    gameThread = new Thread(this);  //Line 327
    gameThread.start();
}

The whole code can be found here .

I thought I'd do it like this:

private val gameThread: Thread? = null
.
//Line 310 same as Java -- here I can't find the sleep-method
//Line 319 same as Java
.
gameThread? = Thread(this)
gameThread.start()

PS I have read this article, but I don't know how to fit it in.

Answer 1

You can convert code from Java to Kotlin

1. On the main menu, point to Code menu.
2. Choose Convert Java File to Kotlin File.

.

@Volatile internal var playing: Boolean = false
internal var gameThread: Thread? = null //Line 29

private fun control() {
    try {

        //because that don't exist you can try that
        //gameThread!!.sleep(17)          //Line 310

        Thread.sleep(17)
        gameThread!!.stop()  //Line 310
    } catch (e: InterruptedException) {
        //catch things here
    }

}

fun pause() {
    playing = false
    try {
        gameThread!!.join()             //Line 319
    } catch (e: InterruptedException) {
        //catch things here
    }

}

fun resume() {
    playing = true
    gameThread = Thread(this)  //Line 327
    gameThread!!.start()
}