how to search word which only starts with "b" from apple, an , bool,abc, abort, boll, god , good etc in listview in Android?

See more:

Android

ListView

SQLite

search

I am doing one Android project using sqlite DB and was able to populated the lists in listview.
I was also able to search the words in listview using following codes:

@Override
           public void onTextChanged(CharSequence s, int start, int before, int count) {

               MainActivity.this.myAdapter.getFilter().filter(s);

or

@Override
           public boolean onQueryTextChange(String newText) {
               // myAdapter.getFilter().filter(newText );
               if (TextUtils.isEmpty(newText)) {
                   lvUsers.clearTextFilter();
               } else {
                   lvUsers.setFilterText(newText.toString());
               }
               return true;
}

but i am getting random words which is related to the entered string from listview, suppose i have words like apple, an , bool,abc, abort, boll, god , good etc. So i need to get only "bool", "boll" while i enter "b" EditText or searchview. but now i am getting bool,abc,abort and boll so on.
therefore, your kind helps are most appreciated.Thank You