public void addBookClicked(View view) throws IOException {
   //        EditText et =(EditText)findViewById(R.id.bookName);
   Book newBook = new Book();
   newBook.setBookName(((EditText) findViewById(R.id.editBookName)).getText().toString());
   newBook.set_price(
       Integer.parseInt(((EditText) findViewById(R.id.editBookPrice)).getText().toString()));
   final Backend backend = BackendFactory.getInstance(this);
   backend.addBook(newBook);
   super.onBackPressed();
 }