Refresh ExpandableListView from within my adapter

Question

I found only one similiar question and it didn't help me. I hope you can help me, because I'm stuck.

This is my custom adapter (only the relevant part):

MyExpandableListAdapter:

public class MyExpandableListAdapter extends BaseExpandableListAdapter {

    //...

    @Override
    public View getChildView(int groupPosition, int childPosition,
            boolean isLastChild, View view, ViewGroup parent) {     
        ChildInfo childInfo = (ChildInfo) getChild(groupPosition, childPosition);
        if (view == null) {
            LayoutInflater infalInflater = (LayoutInflater) context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            view = infalInflater.inflate(R.layout.prisustva_detaljno_child_row,
                    null);
        }

        Button delete = (Button) view.findViewById(R.id.delete);
        delete.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                RelativeLayout Rl = (RelativeLayout) v.getParent();
                TextView id = (TextView) Rl.findViewById(R.id.id_prisustvo);
                PrisustvaAdapter deleteByID = new PrisustvaAdapter(context);

                deleteByID.openToWrite();
                deleteByID.openToRead();
                deleteByID.deleteID(id .getText().toString());
                deleteByID.close();

                Toast.makeText(context, "Successfully deleted!",
                        Toast.LENGTH_LONG).show();
            }
        });

        // ...
        return view;
    }

// ...
}

Like you can see I have a button in every child row of my ExpandableListView. When I click on that button it triggers the deletion process in my database, as you can also see I have to do the deletion from within my adapter, because only there I can create the click event for the button inside the child row. I want to know how can I refresh my ExpandableListView when I remove the data from database? Do I have to do it from inside the adapter? If not, what’s the alternative?

P.S: If you guys need more code, please let me know.

score 8 · Accepted Answer · answered Mar 12 '13 at 01:04

8

I can't be sure without seeing the rest of your code (how you instantiate your BaseExpandableAdapter) but calling notifyDatasetChanged() at the end of your onClick() method should do the trick.

answered Mar 12 '13 at 01:04

znat

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I tried that already but it didn't work. Shouldn't I call `notifyDatasetChanged()` after i delete the child row. Because I'm deleteing it only from my database, not from the list too. When I worked with an ListView i had this methods `adapter.remove()` and `adapter.add()` after that i called `notifyDatasetChanged()` and it worked like a charm, but i can't figure it out with ExpandableListView. – Aksiom Mar 12 '13 at 01:14
1

If your adapter is based on a list (and not on the db), you must remove it from the list and then call notifyDataSetChanged(). – znat Mar 12 '13 at 01:21
2

I managed it after I found out how to remove the specific item from my list. That was my only problem, and it was so simple. Thank you for your hints, helped me a lot. P.S. I had an ArrayList of ArrayLists that I linked with LinkedHashMap. Didnt know at first how to get the specific item from there. But at the end it was simple. – Aksiom Mar 12 '13 at 01:33

Refresh ExpandableListView from within my adapter

1 Answers1