android - Best way to handle multiple getView calls from inside an Adapter

Question

I have a ListView with custom ArrayAdapter. Each of the row in this ListView has an icon and some text. These icons are downloaded in background,cached and then using a callback, substituted in their respective ImageViews. The logic to get a thumbnail from cache or download is triggered every time getView() runs.

Now, according to Romain Guy:

"there is absolutely no guarantee on the order in which getView() will be called nor how many times."

I have seen this happen, for a row of size two getView() was being called six times!

How do I change my code to avoid duplicate thumbnail-fetch-requests and also handle view recycling?

Thanks.

Answer 1

Exactly, that could happen for example when you have

android:layout_height="wrap_content"

in your ListView definition. Changing it to fill_parent/match_parent would avoid it.