so#43490519

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  media: Ember.inject.service(),

  
});

controllers.index.js

import Ember from 'ember';

export default Ember.Controller.extend({
    media: Ember.inject.service()
});

routes.index.js

import Ember from 'ember';

export default Ember.Route.extend({
  media: Ember.inject.service(),
  
  activate() {
    console.log(this.get('media.isMobile'));
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>

templates.index.hbs

{{media.isMobile}}
<br>
{{media.classNames}}

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1",
    "ember-responsive": "2.0.2"
  }
}