Dictionary Search in Android Keyboard

I intend to make a keyboard and integrate a custom dictionary for it (without ContentProvider). I searched in the net and found the android example of Searchabe Dictionary

Here a FTS Virtual Table was created and the query was passed from an activity using SearchManager.QUERY to the below method

public Cursor getWordMatches(String query, String[] columns) {
    String selection = COL_WORD + " MATCH ?";
    String[] selectionArgs = new String[] {query+"*"};

    return query(selection, selectionArgs, columns);
}

My question is if I have the string for what I will be searching in the database already, how to build the query(equivalent to SearchManager.QUERY as mentioned in the example) by myself as my keyboard will not always use Searchable fields?