On Button Click how to increment counter and show in textview

Question

I am working on a shopping cart assignment for that I have created a custom ListView that contains the Picture, Price and Add to Cart button in each row. I also have a textview

Answer 1

Your tv TextView isn't in the list row layout(where you search for it right now). You'll have to look for it in the activity layout if you declared it there(or in the layout where you declared it):

final TextView tv  = (TextView)findViewById(R.id.tvCount);