How to increment a value on view holder variables in android?

Question

I have a viewholder in my Android app and I tried to set an incremented value on a textfield. I tried it like following,

Activity

Answer 1

 > But this is incrementing randomly

that is because the viewholder may belong to different order-lines.

Example

• in the beginning viewholder#1 belongs to orderline #1 with inc=2
• if you scroll down the listbox orderline #1 becomes invisible and orderline #27 becomes visible. .
• now orderline #27 is reusing viewholder#1 and with inc=2

how to fix this:

you need an objectmodell that store the data inc, articleid, quantity, unitprice, articlename, ......

 final OrderItem orderItem = (OrderItem) objects.get(position);
 ...
 orderItem.inc++;

See also https://stackoverflow.com/search?q=listview+random