Why does getCount in adapter is being called so many times?

Question

I have a custom list and it takes few minutes to show-up. When I was trying to check where the problem is, I saw that even when I have only 1 item in the list, the method getCount() is being called 5 times, getVIew() is being called once, an then getCount() is being called to more time. Overall getCount() is being called 7 times. Does that makes sense?

Thank you!

Show the code. And I rather doubt getCount() make your list crawl — Marcin Orlowski, Nov 26 '12 at 10:27
Scrolling is fine. I mean it's takes time for the list view to appear on screen. I will attach the code soon I hope. Tnx — user1787773, Nov 26 '12 at 14:21

sdabet · Accepted Answer · 2015-12-09T13:09:39.957

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You can see here the different internal calls to the Adapter.getCount() method.

But you must keep in mind that you have no control on how this method is gonna be called.

It can be called multiple times and that's why you have to keep it as fast as possible.

edited Dec 09 '15 at 13:09

answered Nov 26 '12 at 10:28

sdabet

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Sorry, but I didn't understood the "keep it as fast as possible" part- this method only returns the array size right? – user1787773 Nov 26 '12 at 10:47
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Sure. But you can override it as you like. The idea is to make sure you don't do any costly computation in it, since it is likely to be called many times and in UI thread. – sdabet Nov 26 '12 at 10:48
I didn't override it. all I do is return the array size. So I guess that's mean that the time that takes the listView to appear has got nothing to do with the getCount() that being called many times? – user1787773 Nov 26 '12 at 14:19
Probably not...You could use DDMS profiling tools to see what actually consumes CPU – sdabet Nov 26 '12 at 14:20

score 2 · Answer 2 · answered Mar 22 '13 at 06:02

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getCount() is called too many times because App-USER can update its list ( can add data in its storage ) anytime and thats why we return , (storage).size() (total number of elements).

answered Mar 22 '13 at 06:02

Tushar

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score 0 · Answer 3 · edited Sep 21 '15 at 13:05

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Adapter getCount() method will be called in following cases.

1) when setting the adapter to List view/ Grid View.

2) when we call notifyDataSetChanged on Adapter.

So, check in your code, you might be doing the above cases more time or recursively..

edited Sep 21 '15 at 13:05

Kushal

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answered Sep 15 '14 at 17:35

user3506878

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score 0 · Answer 4 · edited Sep 21 '15 at 13:05

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You should have a search button that updates the adapter when searching. That method get called drawing the view multiple times, if inside that method you have a setAdapter, then, getCount will be called many times, and will ended up returning 0 and you view will not be filled.

edited Sep 21 '15 at 13:05

Kushal

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answered Aug 30 '15 at 09:17

Sterling Diaz

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Why does getCount in adapter is being called so many times?

4 Answers4