从android中的服务器验证共享首选项概念登录页面

i am validation of login page is done by server side.i create one checkbox for remember username and password.if check box is checked it remembers the username and password.But the problem is even if check box unchecked also it finds stored username and password. now i want if checkbox is unchecked means it cannot remember username and passwordi am validation of login page is done by server