Listview with custom adaptor help

Hello, this is my first post as I have not long started Android app development.

I was hoping for some advice on the app I am messing about with at the moment. There might be a better way which I have not come across so it would be really good if anyone could point me in the right direction.

I am basically wanting a list with a title, sub title, a picture and a quantity in each row. At the bottom of the screen are two buttons, Increment and Decrement. They manipulate the quantity number for the currently selected row.

I have got my app to the point where that works but does not change the quantity value displayed in the selected row. Only the variable value which I show on the screen temporarily with a Toast. This is where I have got stuck for some time.

I am not sure what to search for anymore and hope someone could give me a bit of information on what I could try or maybe just say I have gone about the whole thing in the wrong way. Incidentally, I am using a listview with a custom adaptor and fill the list initially with an array.

Any suggestions would be brilliant!

 

Hi BitGriff, here is my adaptor code. Its a bit of a jumble as I have followed various tutorials to get to where I am. Let me know if any other bits of my code will help.