public void onListItemClick(
ListView parent, View v,
int position, long id)
{   
    open_database_rw();

    Cursor cursor = db.query("tbl_homework", new String[] {"hw"}, 
            "_id = 1", null, null, null, null);

    int column = cursor.getColumnIndex("hw");
    String item = cursor.getString(column);

    Toast.makeText(this, item, Toast.LENGTH_SHORT).show();

}