token = GetTokenFromSession();
if (token == null){
    Logout();
    NavigateToAccountActivity();
}
else {
    String userDetailsJson = GetUserDetailsFromToken(token.getToken(), MainActivity.this);
    AccountViewModel userDetails = DeserializeUserDetails(userDetailsJson);
    if (userDetails.getStatusCode() == 200){

    }
    else {
        Toast messageBox = Toast.makeText(MainActivity.this , userDetails.getMessage() , Toast.LENGTH_LONG);
        messageBox.show();

        Logout();
        NavigateToAccountActivity();
    }
}

private AccountViewModel DeserializeUserDetails(String userDetailsJson) {
      AccountViewModel result = new AccountViewModel();

      JSONObject jsonResult = null;
      try {
          jsonResult = new JSONObject(userDetailsJson);
          result.setStatusCode(jsonResult.getInt("StatusCode"));
          result.setMessage(jsonResult.getString("Message"));

          if (result.getStatusCode() == 200) {
              result.setUserId(jsonResult.getInt("userid"));
              result.setUsername(jsonResult.getString("user"));
              result.setEmail(jsonResult.getString("email"));
              result.setPassword(jsonResult.getString("password"));
              result.setActive(jsonResult.getBoolean("isactive"));
          }

      } catch (JSONException e) {
          e.printStackTrace();
      }

      return  result;
  }

  private String GetUserDetailsFromToken(String token, MainActivity activity) {
      String result = null;
      try {
          result = new ValidToken(activity).execute(config.getValidTokenEndPoint(), token).get();
      } catch (InterruptedException e) {
          e.printStackTrace();
      } catch (ExecutionException e) {
          e.printStackTrace();
      }
      return result;
  }

  private void NavigateToAccountActivity() {
      Intent main = new Intent(MainActivity.this, AccountActivity.class);
      startActivity(main);
  }

  private void Logout() {
      sharedpreferences = getSharedPreferences(AccountActivity.tokenSession, Context.MODE_PRIVATE);
      SharedPreferences.Editor editor = sharedpreferences.edit();
      editor.clear();
      editor.commit();
  }

  private TokenViewModel GetTokenFromSession() {
      TokenViewModel result = new TokenViewModel();
     
      sharedpreferences = getSharedPreferences(AccountActivity.tokenSession, Context.MODE_PRIVATE);
      result.setToken(sharedpreferences.getString(AccountActivity.tokenKey.toString(), ""));

      if (result.getToken() == "")
          return null;
      
      return result;
  }