Handling focus in ExpandableListView

by Brian » Sat, 26 Sep 2009 02:17:19 GMT


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 Hi there,

I have been tinkering with the ExpandableListView and would like to
tweak its behaviour a little bit. Right now you can navigate through
the expandable list and when you select an entry (group) it will
expand and display its children.  However, I would like to expand the
group automatically as soon as the group receives the focus (almost
like a fisheye list).

I managed to overwrite  "onGroupExpand(int groupPosition)"  to close
all other entries before expanding the selected group. But I cannot
find any way to install any focus listeners which gets notified when a
group receives focus... Does anyone know how to do this?

Regards, Brian

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Handling focus in ExpandableListView

by Justin Anderson » Sat, 26 Sep 2009 12:45:40 GMT


 Try implementing the AdapterView.OnItemSelectedListener interface...

Thanks,
Justin

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Handling focus in ExpandableListView

by Brian » Wed, 30 Sep 2009 03:26:51 GMT


 Yeah - works like a charm!
Thanks, Justin!

Here the code snippets for others to reuse:



public class ProjectList extends ExpandableListActivity
        implements AdapterView.OnItemSelectedListener

...

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        ExpandableListView listView = getExpandableListView() ;
        listView.setOnItemSelectedListener(this) ;
        ...
    }

...

    //-- Callback when an (group) item is selected in the list
    public void onItemSelected(AdapterView<?> arg0, View arg1, int
arg2, long arg3) {
        Log.d( Constants.LOG_TAG, "onItemSelected()" );
        ...
    }


    //-- Callback when nothing is selected in the list
    public void onNothingSelected(AdapterView<?> arg0) {
        Log.d( Constants.LOG_TAG, "onNothingSelected()" );
    }
....





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