"A trick often used by iOS devs is to use the tag of a view to hold lookup information, such as offset in arrays. With Android you can shove the entire object into the tag; pretty useful."
Yes, but if it's something like a ListView, don't put offset in array there, because the views are recycled (when user scrols), so you're likely to end up with corrupted data. I got bitten by this in the beginning. You can go to great lengths to prevent this from happening, but it will be hard for a reason, because that's abusing the design principles.
I'd recommend reading up on the ViewHolder pattern in this context.
Long story short: cache all the references to all specific sub-views of the row view in the tag (so you don't have to retrieve them again and again) - that's good practice. Just don't store any position-specific data in it.
Yes, but if it's something like a ListView, don't put offset in array there, because the views are recycled (when user scrols), so you're likely to end up with corrupted data. I got bitten by this in the beginning. You can go to great lengths to prevent this from happening, but it will be hard for a reason, because that's abusing the design principles.
I'd recommend reading up on the ViewHolder pattern in this context.
Long story short: cache all the references to all specific sub-views of the row view in the tag (so you don't have to retrieve them again and again) - that's good practice. Just don't store any position-specific data in it.
Watch http://youtu.be/wDBM6wVEO70?t=9m50s - very informative