Activities and ListActivities with button and lists

by ~ TreKing » Fri, 23 Apr 2010 10:37:21 GMT


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Cool, me too! Well, mostly buses, but same diff.



Sure you can.



No, you don't HAVE to, but extending ListActivity does simplify things if
your activity is predominantly list-oriented.



Crashes HOW? We can't read your mind (or code).

 By the way, if I put
"public class NextTrain extends Activity {"

Did you actually add a ListView to the Activity?



I can try.
If you extend ListActivity you can add a header view to your ListView
containing your two buttons.
Alternatively if you extend Activity, you can create a layout with your two
buttons and a ListView.



You're welcome in advance.

-------------------------------------------------------------------------------------------------
TreKing - Chicago transit tracking app for Android-powered devices
 http://sites.google.com/site/rezmobileapps/treking 

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1. Code compiled with SDK 2.0 does not install (and therefore run) on 1.5 emulator

I did signed export of the package while setting the target as 2.0.
Then I tried to install the package by downloading it *through
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It works on 1.6 and 2.0 though.

Compiling with 1.6 set as the target seems to install on all the
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Is it zipalign issue? Or if not - can someone clarify that to me? For
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who knows and if this is going to be still a problem, how should be go
about backward compatibility?



Regards,
Max.

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2. ListActivity, cursor requerying, and view collision

I have a ListActivity that uses a managed cursor. Each row in the list
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The updates are sometimes happening on 2 rows instead of 1. For
example, the pressed button state shows both for the pressed button
and a button on another row (a fraction of a second later). In my
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getting recycled and reused in reverse order through LogCat:

... android.widget.imagebut...@437a0288
... android.widget.imagebut...@43799318
... android.widget.imagebut...@43791d60
... android.widget.imagebut...@437832c8
... android.widget.imagebut...@437832c8
... android.widget.imagebut...@43791d60
... android.widget.imagebut...@43799318
... android.widget.imagebut...@437a0288

It isn't only the button states that are getting mixed up - I also
have text views and progress bars that are sometimes getting updated
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Is there some trick to prevent this from happening?

Thanks in advance,
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