android ormlite登录注册的例子(2)

            { 
                String usernameString=username.getText().toString(); 
                String passwordString=password.getText().toString(); 
                UsersDao usersDao=new UsersDao(); 
                List<UsersEntity> userlist=new ArrayList<UsersEntity>(); 
                try 
                { 
                    Dao<UsersEntity, Integer> userDao=getHelper().getUserDataDao(); 
                    userlist=usersDao.findUser(userDao,usernameString, passwordString); 
                } catch (SQLException e) 
                { 
                    e.printStackTrace(); 
                } 
                if(userlist==null||userlist.size()<=0) 
                { 
                    alert("用户名或密码错误"); 
                } 
                else  
                { 
                    alert("欢迎登录"); 
                    Intent intent =new Intent(); 
                    intent.setClass(OrmliteLoginDemoActivity.this, welcom.class); 
                    startActivity(intent);