Which listener method do I have to override/declare to put a mark in my googlemap activity when I touch the map with my finger?

Question

Which method do I have to override to put a mark in my Google Map activity when I touch the map with my finger?

I tried with this in the oncreate method (like a button onclickslistener) but it doesn't work:

this.setOnClickListener(new View.OnClickListener() {
    public void onClick(View view) {
        //// Here todo the code for put the mark
    }

});

Which method do I have to override or declare?

Thanks.