How to refer to the original position of a list item when text filter is enabled?

Question

When I use edit text to filter the items, the list positions get all messed up and the items no longer call the proper intent. Any help is appreciated

lv.se         


        

Answer 1

Assuming you are using a custom bean object to store your name & website values and an ArrayAdapter to show them in your ListView, like so

public class NamedLink {
    final String mName;
    final String mWebsite; 
    public NamedLink(String name, String website) {
        mName = name;
        mWebsite = website;
    }
    @Override
    public String toString() {
        return mName;
    }
}

With an adapter, defined something like this:

mAdapter = new ArrayAdapter(this, android.R.layout.simple_list_item_2, mLinks) {
        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            if (convertView == null) {
                convertView = LayoutInflater.from(WhateverYourActivityIsNamed.this).inflate(android.R.layout.simple_list_item_2, null);
            }
            NamedLink link = getItem(position);
            // This probably deserves a ViewHolder
            ((TextView) convertView.findViewById(android.R.id.text1)).setText(link.getName());
            ((TextView) convertView.findViewById(android.R.id.text2)).setText(link.getWebsite());
            return convertView;
        }
    };

When you filter the array adapter it will match against the beans #toString(), which in this case returns the name. When filtered, the array adapter maintains a properly indexed copy of your list of beans internally - i.e. you can use the position you get in the click listener like this:

getListView().setOnItemClickListener(new OnItemClickListener() {
        public void onItemClick(AdapterView parent, View view, int position, long id) {
            // getItemAtPosition() will return a NamedLink from the filtered
            // list maintained inside the ArrayAdapter
            NamedLink link = (NamedLink) parent.getItemAtPosition(position);
            Intent openDetails = new Intent(Test.this, ResourceDetails.class);
            Bundle b = new Bundle();            
            b.putString("name", link.getName());
            b.putString("web", link.getWebsite());
            openDetails.putExtras(b);
            startActivity(openDetails);  
        }
    });