This question may be stupid but... why? Personally I like the Microsoft style where { is at the same column as the matching }. In all languages I have used, it did not matter where { was placed.
But in Kotlin, only this works.
image_view.viewTreeObserver.addOnGlobalLayoutListener{
};
And this causes an error.
image_view.viewTreeObserver.addOnGlobalLayoutListener
{
};
https://kotlinlang.org/docs/reference/grammar.html#semicolons
Because your second example has the same meaning as
image_view.viewTreeObserver.addOnGlobalLayoutListener;
{
};
a property access followed by an empty lambda.
Braces in the same column and indented with the line above is not Microsoft style - it's known as the Allman style. It's a style I wish people would use, but sadly K&R's ancient style was pushed by Sun (Java) as the "official" style and Kotlin has followed suit.
You can do this:
image_view.viewTreeObserver.addOnGlobalLayoutListener()
{
}
to stop Kotlin complaining.
For further information on styles, see: