Menu
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.
523
Kotlin gives us the power to declare high-order functions. In a high-order function, we can pass and return functions as parameters. This is an extremely useful feature and makes our code much easier to work with.
To return values, we use the return keyword. In the example, we have two square functions. When a funcion has a body enclosed by curly brackets, it returns a value using the return keyword. The return keyword is not used for functions with expression bodies.
If your question is can you use kotlin files in java files and vice versa then the answer is yes.
We can't directly pass the whole method as an argument to another method. Instead, we can call the method from the argument of another method. // pass method2 as argument to method1 public void method1(method2()); Here, the returned value from method2() is assigned as an argument to method1() .
The error message is caused by the code before your:
showAdWithCallback(() -> {
return null;
});
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
