notixamarin7.txt

// En NewsListActivity.cs

protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);

            // Create your application here
            SetContentView(Resource.Layout.NewsList);

            var newsListView = FindViewById<ListView>(Resource.Id.newsListView);

            var newsService = new NewsService();
            var news = newsService.GetNews();
            newsListView.Adapter = new NewsListAdapter(this, news);

            newsListView.ItemClick += NewsListView_ItemClick;
        }

        private void NewsListView_ItemClick(object sender, AdapterView.ItemClickEventArgs e)
        {
            var intent = new Intent(this, typeof(MainActivity));
            var id = (int)e.Id;
            intent.PutExtra(MainActivity.KEY_ID, id);
            StartActivity(intent);
        }

// En el MainActivity.cs

internal static string KEY_ID = "KEY_ID";

        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);

            // Set our view from the "main" layout resource
             SetContentView (Resource.Layout.Main);

            var id = Intent.Extras.GetInt(KEY_ID);

            var newsService = new NewsService();

            var news = newsService.GetNewsById(id);

            var newsTitle = FindViewById<TextView>(Resource.Id.newsTitle);
            var newsBody = FindViewById<TextView>(Resource.Id.newsBody);
            var newsImage = FindViewById<ImageView>(Resource.Id.newsImage);

            var display = WindowManager.DefaultDisplay;
            Android.Graphics.Point point = new Android.Graphics.Point();
            display.GetSize(point);

            var imageURL = string.Concat(ValuesService.ImagesBaseURL, 
                news.ImageName);

            Picasso.With(ApplicationContext)
                .Load(imageURL)
                .Resize(point.X, 0)
                .Into(newsImage);

            newsTitle.Text = news.Title;
            newsBody.Text = news.Body;
        }