how to modify the value listview listview outside the control of internal controls

Recently doing a shopping cart, the display list using a listview control, listview internal controls include buttons to add, reduce the number and so on. When you want to click on the increase, reducing the number of buttons, listview outside the control can display a corresponding amount.

Expressed may not understand;

Take Jingdong shopping cart to make you an example



Click "+", "-", the above totals can change in real time.

Just learning android did not take long, expert advice

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Alas, my mind so bad that he get, Results posted