问使用预定义的过滤器过滤安卓ListView

EN

class MyFilter extends Filter {

    private final MyAdapter myAdapter;

    public MyFilter(MyAdapter myAdapter) {
        this.myAdapter = myAdapter;
    }

    @Override
    protected Filter.FilterResults performFiltering(CharSequence constraint) {
        FilterResults results = new FilterResults();
        if (constraint == null || constraint.length() == 0) {
    // unfiltered: show all
            results.values = myAdapter.getOriginalList();
            results.count = myAdapter.getOriginalList().size();
        } else {
    // filtered
            List<Integer> newWorkingList = new ArrayList<>();
            if (constraint.equals('1')) {
    // odd
                for (Integer integer : myAdapter.getOriginalList()) {
                    if (integer % 2 == 1) {
                            newWorkingList.add(integer);
                    }
                }
            } else if (constraint.equals('2')) {
    // even
                for (Integer integer : myAdapter.getOriginalList()) {
                    if (integer % 2 == 0) {
                        newWorkingList.add(integer);
                    }
                }
            }
            results.values = newWorkingList;
            results.count = newWorkingList.size();
        }
        return results;
    }

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

public class MyAdapter extends ArrayAdapter<Integer> implements Filterable

    private MyFilter MyFilter;

    @Override
    public Filter getFilter() {
        if (myFilter == null) {
            myFilter = new myFilter(this);
        }
        return myFilter;
    }

myAdapter.getFilter().filter(null);
myAdapter.getFilter().filter('1');
myAdapter.getFilter().filter('2');