.state('classrooms',{
 url: '/classrooms/:id'
})
.state('classrooms',{
 url: '/classrooms/{id}'
})
.state('activities',{
 url: '/activities',
 params: {
 id: { value: 42}
 }
})

function ClassroomController($stateParams){
 var classroomID = $stateParams.id;
}

$stateProvider
 .state('app.example1', {
  url: '/example',
  views: {
   'menuContent': {
   templateUrl: 'templates/example.html',
   controller: 'ExampleCtrl'
   }
  }
  })
  .state('app.example2', {
  url: '/example2/:object',
  views: {
   'menuContent': {
   templateUrl: 'templates/example2.html',
   controller: 'Example2Ctrl'
   }
  }
  })

.controller('ExampleCtrl', function ($state, $scope, UserService) {
 
 
 $scope.goExample2 = function (obj) {
 
  $state.go("app.example2", {object: JSON.stringify(obj)});
 }
 
 })
 .controller('Example2Ctrl', function ($state, $scope, $stateParams) {
 
 console.log(JSON.parse($state.params.object));
 
 
 })