Filter Listview with custom base adapter

If you want to filter listview item with name then follow below steps

write this code in oncreate method of your main activity

edtsearch.addTextChangedListener(searchTextWatcher);
(here edtsearch is your edittext,searchTextWatcher is method define outside oncreate method)

create method outside oncreate method of your main activity

private TextWatcher searchTextWatcher = new TextWatcher() {
        @SuppressWarnings("static-access")
        public void onTextChanged(CharSequence s, int start, int before,
                int count) {
            if(phonebookadp != null){
                phonebookadp.getFilter().filter(s.toString());   
            }
        }
        public void beforeTextChanged(CharSequence s, int start, int count,int after) {}
        public void afterTextChanged(Editable s) {}
    };

here phonebookadp is your adapter.

here declaired adapter in your main activity 

    public class Phonebook_Adapter extends BaseAdapter implements Filterable{

        private LayoutInflater l_Inflater;

        public Phonebook_Adapter(Context context) {
            l_Inflater = LayoutInflater.from(context);

            // this is new array list if we click on backpress so fill listview back with this arraylist
            // fill this array list where mylstcont list filling
            mycheckcontlst = new ArrayList<String>();
        }
        public int getCount() {
            // TODO Auto-generated method stub

            // this is your list view items
            return mylstcont.size();
        }

        public Object getItem(int position) {
            return mylstcont.get(position);
        }

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

        public View getView(final int position, View convertView, ViewGroup parent) {
          
            // Do yout stuff

            return convertView;
        }
   
        @Override
        public Filter getFilter() {
            // TODO Auto-generated method stub
            return new Filter(){
              
                // ContactSetGet is your gettersetter class

                @Override
                protected FilterResults performFiltering(CharSequence prefix) {
                    // TODO Auto-generated method stub
                    FilterResults results = new FilterResults();
                    List<ContactSetGet> i = new ArrayList<ContactSetGet>();
                  
                    if (prefix!= null && prefix.toString().length() > 0) {

                        for (int index = 0; index < mylstcont.size(); index++) {
                            ContactSetGet si = mylstcont.get(index);
                            Log.i("----------------si.getFirstName()---------","."+si.getName());
                            Log.i("----------------prefix---------","."+prefix.toString());
                            //String number
                            if(si.getName().startsWith(prefix.toString())){
                              i.add(si);
                            }
                        }
                        results.values = i;
                        results.count = i.size();                 
                    }
                    else{
                        synchronized (mylstcont){
                            results.values = mycontnamesetget;
                            results.count = mycontnamesetget.size();
                        }
                    }
                    return results;
                }

                @SuppressWarnings("unchecked")
                @Override
                protected void publishResults(CharSequence constraint,
                        FilterResults results) {
                    // TODO Auto-generated method stub
                    mylstcont = (ArrayList<ContactSetGet>) results.values;
                        Phonebook_Adapter.this.notifyDataSetChanged();
                }
            };
    }
}