scroll Complex最佳实践中的Android Complex项目列表

Question

I´m developing an app in which I have a list of products, sometimes are a huge list and other times are only one or two items.

I read this items from a local database, right? ok, when I have about 20 o 30 items, I think the return is very slow, it takes one or two seconds rendering items and I need to know the best practices about that. I have tested two ways:

• The more tricky (I think), is creating views programmatically and adding to the scrollview as childs of the linearlayout inside.
• The best for design: having an item-theme in a xml and inflating once by each item.

Is there a better way? I´m sure yes!

My items are a little bit complex: image, name, category, provider, price, some buttons with "onclick" listeners, two little icons. Everything each item.

It is very important for me to speed up that process.

Answer 1

you can use listview and use the attr : android:descendantFocusability=”blocksDescendants”

it can make your item widget respond some click or touch

Answer 2

My first thoughts on what you described are:

• Create an xml layout for the listing
• When you get the full list of items, store listing data somewhere
• Inflate 5 (or 10 or whatever a reasonable amount of might be) listing layouts into the scroll view and use the data to fill them
• Use a listener to check when the user has scrolled to the bottom of the scroll view... or halfway down or whatever you choose
• Inflate the next set of items if they exist

This should prevent the slowdown and if you implement it correctly the user won't even know they aren't all loaded.

I think you need to implement a scroll view type to do this... do some searching for the scrollviewlistener.

It should be pretty straight forward.

Answer 3

I found the answer . Really cool.