android - Cipher AES, no error exception, but init not works -

i try cipher outputs after "cipher.init" won't output. no exceptions..and don't know why...(new on android)

public void login() {         logindata logindata = this.fragmentbox.getupdatedlogindata();          string finishstring = new string();         try {             cipher cipher = cipher.getinstance("aes");             byte[] output = null;              secretkeyspec secretkey = new secretkeyspec(                     globals.encryptpw.getbytes(), "aes");              system.out.println(secretkey.getencoded().tostring() +  "----" + globals.encryptpw);             cipher.init(cipher.encrypt_mode, secretkey);              output = cipher.dofinal(logindata.getpassword().getbytes());              byte[] encryptedusernamestring = base64.encode(output, 0);             finishstring = new string(encryptedusernamestring, "utf-8");          } catch (invalidkeyexception e) {             e.getstacktrace();             log.v("fehler im code","");         } catch(exception e){}           system.out.println("code: " + finishstring); } 

any idea?