For me 2️⃣ has an advantage because of the

OnClick

annotation and also the ability to use it in any class like a

ViewHolder

for example

with 1️⃣ onclick is as simple as:

someButton.setOnClickListener {
    // do stuff
}

so arguably even easier than 2️⃣ ?

Separate method is better choice for me to not create a clutter on the

onCreate

method

@OnClick(R.id.some_button) fun onSomeButtonClicked() {
   // do something
}

but more importantly having the ability to use it in any class like a

ViewHolder

is a huge advantage for me