How to pass function as parameter from java to kotlin method?

Question

I have a Kotlin Code:

fun showAdWithCallback(callback:() -> Unit) {
    if (AdsPrefs.shouldShowInterstitialAd()) {
        mInterstitialAd.show()
        this.callback = callback
    } else {
        callback()
    }
}

Now I want to call this method from a Java Class. I am confused about how to call this. Here is what I tried

  showAdWithCallback(() -> {
        return null;
    });

But it shows following error.

@P.Juni The reference you gave has a callback that accept one argument, but I have a callback without any parameters. So that doesn't solve the problem. — Prajeet Shrestha
– Prajeet Shrestha, Commented Jul 30, 2019 at 7:10
@PrajeetShrestha please share the code before your showAdWithCallback — Bartek Lipinski
– Bartek Lipinski, Commented Jul 30, 2019 at 7:15
@BartekLipinski. Oh u got me........I had return statement just before showAdWithCallback. I was randomly embedding showAdWithCallback to tryout, overlooked the return statement. Thank u so much. You can put it as a answer I will accept and upvote. — Prajeet Shrestha
– Prajeet Shrestha, Commented Jul 30, 2019 at 7:24

Bartek Lipinski · Accepted Answer · 2019-07-30 08:04:31Z

13

The error message is caused by the code before your:

showAdWithCallback(() -> {
        return null;
});

answered Jul 30, 2019 at 8:04

Bartek Lipinski

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Comments

Yogesh Bangar · Accepted Answer · 2019-07-30 07:48:44Z

1

Call kotlin object and call function

kotlinobject.INSTANCE.showAdWithCallback(()->{
    return null;
})

answered Jul 30, 2019 at 7:48

Yogesh Bangar

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Comments

tragos777 · Accepted Answer · 2019-07-30 07:44:36Z

0

callback:() -> Unit

It's a typically runnable - zero arguments, without return value

answered Jul 30, 2019 at 7:44

tragos777

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