Is there a difference between `listView.invalidate ()` and `adapter.notifyDataHasChanged ()`?

I have a list of items.

I want to delete an item with a long press.

I saw this post and it worked for me.

Just out of curiosity, I am wondering why the other solution did not work for me:

sol 1

I register the list in the context menu:

registerForContextMenu(listView);

and then:

@Override
public void onCreateContextMenu(ContextMenu menu, View v,
                                ContextMenu.ContextMenuInfo menuInfo) {
    if (v.getId()==R.id.comments_list) {
        MenuInflater inflater = getActivity().getMenuInflater();
        inflater.inflate(R.menu.phone_list_contextual_menu, menu);
    }
}

@Override
public boolean onContextItemSelected(MenuItem item) {
    AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) item.getMenuInfo();
    switch(item.getItemId()) {
        case R.id.edit: {
           return true;
        }
        case R.id.delete: {
            comments.remove(info.id);
            listView.invalidate();
            return true;
        }
        default: {
            return super.onContextItemSelected(item);
        }
    }
}

      

        
        
        
      

    

Is there any difference between

listView.invalidate()

and adapter.notifyDataHasChanged()

? besides the subject of the challenge?

what am I missing to delete a job?

sol 2

listView.setOnLongClickListener(new View.OnLongClickListener() {
    @Override
    public boolean onLongClick(View v) {
        int position = (int) v.getTag();
        comments.remove(position);
        listView.invalidate();
        return true;
    }
});

      

        
        
        
      

    

instead

  listView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener(){
        @Override
        public boolean onItemLongClick(AdapterView<?> av, View v, int pos, long id) {
            comments.remove(pos);
            //listView.invalidate();
            arrayAdapter.notifyDataSetChanged();
            return true;
        }
    });

      

        
        
        
      

    

I understand that setOnItemLongClickListener

more suits my need than setOnLongClickListener

, but still

why didn't it work for me?