Android Filter ListView by BaseAdapter

问题

i'm try to write simple filtering ListView by this below code. but that does not work correctly

in this code i'm using ContactListStructure class structure as:

public class ContactListStructure implements Serializable {
    public Long     id;
    public String   name;
    public String   mobile;
    public Bitmap   photo;
    public Boolean  checked;
    ...
}

and i'm fill this class as an ArrayList with phone contacts. after fill that i'm set this list into ListView without any problem,then i'm try to fillter this list by:

/* private ArrayList<ContactListStructure>  contact_item; */

contactsAdapter = new ContactsAdapter ( G.contact_item , ActivityContactList.this);
lstContent.setAdapter ( contactsAdapter );

search_contacts.addTextChangedListener(new TextWatcher() {
    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
        contactsAdapter.getFilter().filter(s.toString());
    }

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count,int after) {
    }

    @Override
    public void afterTextChanged(Editable s) {
    }
});

POST UPDATE search_contacts is an EditText and after type into that ListView dont filter and dont any change. my BaseAdapter :

public class ContactsAdapter extends BaseAdapter  implements Filterable {
    private Context mCtx=null;
    private ArrayList<ContactListStructure> mData=null;
    private ArrayList<ContactListStructure> arraylist;
    private List<ContactListStructure> worldpopulationlist = null;

    private ItemFilter mFilter = new ItemFilter();
    static int i=0;
    public ContactsAdapter (ArrayList<ContactListStructure> contact_item, Context ctx) {
        mData=contact_item;
        mCtx=ctx;
        this.worldpopulationlist = contact_item;
    }

    @Override
    public int getCount() {
        return mData.size();
    }

    @Override
    public ContactListStructure getItem(int position) {
            return worldpopulationlist.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        if(convertView==null) {
            LayoutInflater inflator=((Activity)mCtx).getLayoutInflater();
            convertView=inflator.inflate(R.layout.send_sms,null);

        }
        CheckBox  chk_name_mobile   = (CheckBox)convertView.findViewById(R.id.chk_name_mobile);
        ImageView photo             = (ImageView)convertView.findViewById(R.id.photo);

        String name=mData.get(position).name;
        chk_name_mobile.setText(name);
        if( mData.get(position).photo == null )
            photo.setImageDrawable( G.context.getResources().getDrawable(R.drawable.user) );
        else
            photo.setImageBitmap(mData.get(position).photo);
        return convertView;
    }

    @Override
    public Filter getFilter () {
        return mFilter;
    }

    private class ItemFilter extends Filter {
        @Override
        protected FilterResults performFiltering(CharSequence constraint) {
            String filterString = constraint.toString();
            FilterResults results = new FilterResults();

            final ArrayList<ContactListStructure> list = mData;

            int count = list.size();
            final ArrayList<ContactListStructure> nlist = new ArrayList<ContactListStructure>(count);

            String filterableString ;

            for (ContactListStructure wp : worldpopulationlist)
            {
                if (wp.getName().contains(filterString))
                {
                    //Log.e ("wp: ", String.valueOf ( wp ) );
                    ContactListStructure item = new ContactListStructure();
                    item.id = wp.id;
                    item.name = wp.name;
                    item.mobile = wp.mobile;
                    item.photo = wp.photo;
                    nlist.add(item);
                }
            }

            results.values = nlist;
            results.count = nlist.size();

            return results;
        }

        @SuppressWarnings("unchecked")
        @Override
        protected void publishResults(CharSequence constraint, FilterResults results) {
            arraylist = (ArrayList<ContactListStructure>) results.values;
            notifyDataSetChanged();
        }
    }
}

UPDATE POST:

after help in comments my notifyDataSetChanged not working. after type into edit text thats can be find but listview dont refresh.

回答1:

You can try following this question here: ListView is blank while using getFilter function

It was able to filter based on a choice from the ListView.

回答2:

I think you forgot to add the data returned from result to your mData :

    protected void publishResults(CharSequence constraint, FilterResults results) {
        arraylist = (ArrayList<ContactListStructure>) results.values;
        mData.clear();
        for(int i = 0, i < arraylist.size(); i++)
           mData.add(arraylist.get(i));
        notifyDataSetChanged();
    }
}

来源：https://stackoverflow.com/questions/27272630/android-filter-listview-by-baseadapter