SearchView that filters complex data (object and custom layout)

Question

I have my adapter that extend a class MatchableArrayAdapter that i've found on the internet.

The class allows me to have a complex layout for my list view (layout that is not only Textview, but several layout and textViews).

I have this complex layout because I'm using object with several data inside it (so I can on the same item display a name, an ID...)

So i'm passing an ArrayList of object from my fragment to my adapter.

What I want is this :

I want to add a searchView that will filter on any of the object properties (filter on ID, name, location...)

Any idea how to do that ? I've found that I need to use Filterable but I don't understand why...

Possible duplicate of [SearchView In ListView having a custom Adapter](https://stackoverflow.com/questions/23422072/searchview-in-listview-having-a-custom-adapter) — user, Jan 25 '19 at 10:18

score 0 · Answer 1 · answered Jun 17 '19 at 13:50

so.. it's easier to do the filtering manually with an EditText.

but! if you still want to do it with a Filter and a SearchView, it goes like this:

you need to extend the Filter class, something like this:

private class MyFilter extends Filter {

    @Override
    protected FilterResults performFiltering(CharSequence constraint) {
        final FilterResults results = new FilterResults();

        if (constraint == null || constraint.length() == 0) {
            final ArrayList<MyObject> list;
            synchronized (adapter) {
                list = new ArrayList<>(allObjects);
            }
            results.values = list;
            results.count = list.size();
        } else {
            final String prefixString = constraint.toString().toLowerCase();

            final ArrayList<MyObject> values;
            synchronized (adapter) {
                values = new ArrayList<>(allObjects);
            }

            final int count = values.size();
            final ArrayList<MyObject> newValues = new ArrayList<>();

            for (int i = 0; i < count; i++) {
                final MyObject value = values.get(i);
                final String valueText = value.firstName.toLowerCase() + " " + value.lastName.toLowerCase();
                Log.i("search", valueText);
                if (valueText.contains(prefixString)) {
                    newValues.add(value);
                    Log.i("search", "in");
                }
            }
            results.values = newValues;
            results.count = newValues.size();
        }
        return results;
    }

    @Override
    protected void publishResults(CharSequence constraint, FilterResults results) {
        adapter.students = (List<MyObject>) results.values;
        if (results.count > 0) {
            adapter.notifyDataSetChanged();
        } else {
            adapter.notifyDataSetInvalidated();
        }
    }
}

notice i used firstname and lastname as fields of MyObject, and you should change that to the values you're searching for.

you need to override the method getFilter in your adapter:

@Override
public Filter getFilter(){
    return new MyFilter();
}

setup the searchView query listener:

searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
    @Override
    public boolean onQueryTextSubmit(String query) {
        adapter.getFilter().filter(query);
        return false;
    }

    @Override
    public boolean onQueryTextChange(String query) {
        adapter.getFilter().filter(query);
        return false;
    }
});

hope that helps someone,

cheers

SearchView that filters complex data (object and custom layout)

1 Answers1