Re: [android-developers] Re: What is wrong with Android Adapters?

Kostya Vasilyev Wed, 15 Feb 2012 05:02:45 -0800

AdapterView does not make any guarantees about when and how many timesthe adapter's getView is called.


-- Kostya


15.02.2012 15:35, Olof Hedman пишет:

I did not. I have no need for headers in my lists.
Why do you ask?

Cheers,
Olof

On Feb 14, 12:38 pm, gropapa<[email protected]>  wrote:

did you use addHeaderView() in your code?

On 14 fév, 10:22, jamesc<[email protected]>  wrote:

Also, are you calling notifyDatasetChanged() frequently?
On Feb 14, 9:10 am, jamesc<[email protected]>  wrote:

Hello
Are you using the ViewHolder pattern to recycle Views?
On Feb 13, 9:48 am, Olof Hedman<[email protected]>  wrote:

I have implemented a couple of different adapters in my application.
No matter which base class I use, I get very weird behavior in how the
list calls it to create and bind its views.
I've tested this on 2.3.3, 2.3.6 and Kindle.
This log is from an implementation of BaseAdapter, I put a debug-print
in "getView".
If convertView is null I inflate the view and print "created view".
For every call to getView I print "binding View" when I set its
values.
The code on the end is an id string for the data I bind to the views.
Everything display just as it should, but I get lots of unneccessary
binds!
This is what I get when I set the adapter to the listview:
D/SLPA    ( 4097): created View - android.widget.LinearLayout@405bf190
D/SLPA    ( 4097): binding View - android.widget.LinearLayout@405bf190
position: 0 - to: A5D7W5U9.02
D/SLPA    ( 4097): binding View - android.widget.LinearLayout@405bf190
position: 1 - to: ASQK89Q8.58
D/SLPA    ( 4097): binding View - android.widget.LinearLayout@405bf190
position: 2 - to: ASQK89Q8.37
D/SLPA    ( 4097): binding View - android.widget.LinearLayout@405bf190
position: 3 - to: AEURWHRA.02
D/SLPA    ( 4097): binding View - android.widget.LinearLayout@405bf190
position: 4 - to: ASQK89Q8.44
D/SLPA    ( 4097): binding View - android.widget.LinearLayout@405bf190
position: 5 - to: ASQK89Q8.51
D/SLPA    ( 4097): binding View - android.widget.LinearLayout@405bf190
position: 6 - to: ASQK89Q8.10
D/SLPA    ( 4097): binding View - android.widget.LinearLayout@405bf190
position: 7 - to: AWQHVP6A.11
D/SLPA    ( 4097): binding View - android.widget.LinearLayout@405bf190
position: 0 - to: A5D7W5U9.02
D/SLPA    ( 4097): binding View - android.widget.LinearLayout@405bf190
position: 1 - to: ASQK89Q8.58
D/SLPA    ( 4097): binding View - android.widget.LinearLayout@405bf190
position: 2 - to: ASQK89Q8.37
D/SLPA    ( 4097): binding View - android.widget.LinearLayout@405bf190
position: 3 - to: AEURWHRA.02
D/SLPA    ( 4097): binding View - android.widget.LinearLayout@405bf190
position: 4 - to: ASQK89Q8.44
D/SLPA    ( 4097): binding View - android.widget.LinearLayout@405bf190
position: 5 - to: ASQK89Q8.51
D/SLPA    ( 4097): binding View - android.widget.LinearLayout@405bf190
position: 6 - to: ASQK89Q8.10
D/SLPA    ( 4097): binding View - android.widget.LinearLayout@405bf190
position: 7 - to: AWQHVP6A.11
D/SLPA    ( 4097): binding View - android.widget.LinearLayout@405bf190
position: 0 - to: A5D7W5U9.02
D/SLPA    ( 4097): created View - android.widget.LinearLayout@405ab368
D/SLPA    ( 4097): binding View - android.widget.LinearLayout@405ab368
position: 1 - to: ASQK89Q8.58
D/SLPA    ( 4097): created View - android.widget.LinearLayout@405a85f8
D/SLPA    ( 4097): binding View - android.widget.LinearLayout@405a85f8
position: 2 - to: ASQK89Q8.37
D/SLPA    ( 4097): created View - android.widget.LinearLayout@40548088
D/SLPA    ( 4097): binding View - android.widget.LinearLayout@40548088
position: 3 - to: AEURWHRA.02
D/SLPA    ( 4097): created View - android.widget.LinearLayout@405743e0
D/SLPA    ( 4097): binding View - android.widget.LinearLayout@405743e0
position: 4 - to: ASQK89Q8.44
D/SLPA    ( 4097): created View - android.widget.LinearLayout@405877c0
D/SLPA    ( 4097): binding View - android.widget.LinearLayout@405877c0
position: 5 - to: ASQK89Q8.51
Its not weird that users complain of sluggish UI if these things are
going on!
When the device goes into sleep, I get this:
D/SLPA    ( 4097): created View - android.widget.LinearLayout@40555a00
D/SLPA    ( 4097): binding View - android.widget.LinearLayout@40555a00
position: 0 - to: A5D7W5U9.02
D/SLPA    ( 4097): binding View - android.widget.LinearLayout@40555a00
position: 1 - to: ASQK89Q8.58
D/SLPA    ( 4097): binding View - android.widget.LinearLayout@40555a00
position: 2 - to: ASQK89Q8.37
D/SLPA    ( 4097): binding View - android.widget.LinearLayout@40555a00
position: 3 - to: AEURWHRA.02
D/SLPA    ( 4097): binding View - android.widget.LinearLayout@40555a00
position: 4 - to: ASQK89Q8.44
D/SLPA    ( 4097): binding View - android.widget.LinearLayout@40555a00
position: 5 - to: ASQK89Q8.51
D/SLPA    ( 4097): binding View - android.widget.LinearLayout@40555a00
position: 6 - to: ASQK89Q8.10
D/SLPA    ( 4097): binding View - android.widget.LinearLayout@40555a00
position: 0 - to: A5D7W5U9.02
D/SLPA    ( 4097): binding View - android.widget.LinearLayout@40555a00
position: 1 - to: ASQK89Q8.58
D/SLPA    ( 4097): binding View - android.widget.LinearLayout@40555a00
position: 2 - to: ASQK89Q8.37
D/SLPA    ( 4097): binding View - android.widget.LinearLayout@40555a00
position: 3 - to: AEURWHRA.02
D/SLPA    ( 4097): binding View - android.widget.LinearLayout@40555a00
position: 4 - to: ASQK89Q8.44
D/SLPA    ( 4097): binding View - android.widget.LinearLayout@40555a00
position: 5 - to: ASQK89Q8.51
D/SLPA    ( 4097): binding View - android.widget.LinearLayout@40555a00
position: 6 - to: ASQK89Q8.10
D/SLPA    ( 4097): binding View - android.widget.LinearLayout@405877c0
position: 0 - to: A5D7W5U9.02
D/SLPA    ( 4097): binding View - android.widget.LinearLayout@405743e0
position: 1 - to: ASQK89Q8.58
D/SLPA    ( 4097): binding View - android.widget.LinearLayout@40548088
position: 2 - to: ASQK89Q8.37
D/SLPA    ( 4097): binding View - android.widget.LinearLayout@405a85f8
position: 3 - to: AEURWHRA.02
D/SLPA    ( 4097): binding View - android.widget.LinearLayout@405ab368
position: 4 - to: ASQK89Q8.44
Why on earth would it need to do this when it turns off the screen?!
Is there anyone who can shed some light on this, is it just something
I have to live with, or have I made some stupid mistake?
I have a hard time imagining anything I could have done wrong though,
since the code is really minimal.


--
Kostya Vasilyev

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Re: [android-developers] Re: What is wrong with Android Adapters?

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