transition to a new screen by a programmatically generated button

Question

Made a list for this lesson - list

Now the question is how to switch to a new action using the addbutton button? to do so does not permit.

java filename - ProductAdapter:

viewHolder.addButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            Intent intent=new Intent(this, MainActivity2.class);
            startActivity(intent);
        }
    });