Android cursoradapter filter listview

I'm trying to filter my listview with cursoradapter. This is what I've tried so far: ``` CustomAdapter adapter; Cursor cursor; etSearch.addTextChangedListener(new TextWatcher (){ public void afterTextChanged(Editable arg0) { // TODO Auto-generated method stub } public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) { // TODO Auto-generated method stub } public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) { // TODO Auto-generated method stub adapter.getFilter().filter(cs.toString()); } }); cursor = dbHelper.getAllItemInventoryListings(); adapter = new CustomAdapter(this, cursor); lv.setAdapter(adapter); lv.setTextFilterEnabled(true); adapter.setFilterQueryProvider(new FilterQueryProvider() { @Override public Cursor runQuery(CharSequence constraint) { String strItemCode = constraint.toString(); return dbHelper.getAllItemInventoryListings(strItemCode); } }); ``` When I tried it does not filter. What seems to be wrong? Your help will be appreciated. Thank you.