class NewsScreen(Screen):  #
    news_document = ObjectProperty()

    def __init__(self, **kwargs):
        super(NewsScreen, self).__init__(**kwargs)
        Clock.schedule_once(self.my_init, 0)

    def my_init(self, dt):
        self.news_document.height = dp(size_per_news * (len(news[0:startup_number])) + self.news_document.spacing)

        for item in news[0:startup_number]:
            card = MDCard(size_hint_y=None, height=dp(size_per_news))
            global_layout = GridLayout(cols=2, spacing=dp(20))
            text_layout = BoxLayout(orientation='vertical')
            title = MDLabel(text=item['title'], font_style='Subhead', theme_text_color='Primary',
                            size_hint_y=.2)
            body = MDLabel(text=item.values()[0]['value'][0:substring_chars], theme_text_color='Primary',
                           size_hint_y=.8)
            text_layout.add_widget(title)
            text_layout.add_widget(body)
            a = Image(source='image-loading.gif')
            global_layout.add_widget(a)
            proxy_image = Loader.image('http://ligafutsal.com.br/wp-content/uploads/2016/04/acbf.jpg')
            proxy_image.bind(on_load=partial(self._image_loaded, a))
            global_layout.add_widget(text_layout)
            card.add_widget(global_layout)
            self.news_document.add_widget(card)

    def _image_loaded(self, a, proxy_image):
        if proxy_image.image.texture:
            print 'img loaded'
            a.texture = proxy_image.image.texture