byte[] decodedPrivateKey = Base64.decode(savedText1,0);
PKCS8EncodedKeySpec X509privbKey = new PKCS8EncodedKeySpec(decodedPrivateKey);
privKey = KeyFactory.getInstance("RSA").generatePrivate(X509privbKey);
editText.setText(privKey.toString());

//byte[] bytes2 = cipher2.doFinal(txt.getBytes("UTF-8"));
byte [] decodedMess = Base64.decode(productObject.getString("data"), 0);
Cipher decript2 = Cipher.getInstance("RSA");
decript2.init(Cipher.DECRYPT_MODE,privKey);
byte[] decriptedBytes2 = decript2.doFinal(decodedMess);
String s =new String(decriptedBytes2, "UTF-8");

Toast toast = Toast.makeText(getApplicationContext(), s.toString(), Toast.LENGTH_SHORT);
toast.show();