[android-developers] checkbook issue ,in expandable list view

Hi All,
I am working in an expandable list view by an simple expandable list
adapter.  Also, I have fixed a database, where I store my data.I
managed to display the data in expandable list view. Each child has a
textview and a checkbox. Here is what I'm trying to achieve:

1) the checkboxes change states each time i expand an another group.

How could I fixed this?for example, when I changed the state to
checked for one child , I want to save state for this child .
I tried the onSaveInstance () method, but does nothing.
 2) how could I handle the checkbox for one child each time? How
could  I separare the checkbox of a child? I have to use the
database ?

help me it's urgent


thanks

krishna

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