Passing List of Objects (referenced) to BaseAdapter extended Class and call notifyDataSetChanged() not Working after changing reference

Question

I am doing this for the understanding. In my case I have a class extended by BaseAdapter. in the new class I am passing the list of objects I want to bind to the ListView in android and I keep a reference to that passing list of objects.

ListView list2 = (ListView)findViewById(R.id.attachmentList);
    list2.setAdapter(new LazyAdapter(BaseAdapterExtention.this,getApplication().getInteraction().getList() ));

Like above I keep the data that I am passing as a singleton getApplication().getInteraction().getList() which I call this to get the data.

Each list item has a button, and each list item button has a click listener, when a button is clicked, I am deleting that item and repopulate the data set in the singleton object as below

getApplication().getInteraction().setList(listofObjects).

to do that I am calling an async task and I am passing this adapter

new ListAsync(activity,BaseAdapterExtention.this).execute();

and in onPostExecute() I call the adapter.notifyDataSetChanged(). but the adapter object list is the same, the deletion is not reflected in that list and so, the list view is the same.

What's wrong I am doing?

Answer 1

I added a public method in the Activity that has the ListView and there,

public void notifyDataChangeInAdapter(){
        list2.setAdapter(new BaseAdapterExtention(ExampleActivity.this, getApplication().getInteraction().getList() ));
}

I am calling this method in onPostExecute() method by using the activity reference that I passed to that asynctask constructor.