notixamarin5.txt

// Nota: Debes remover el MainLauncher del MainActivity.cs

// En NewsListRow 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <TextView
        android:text="Small Text"
        android:textAppearance="?android:attr/textAppearanceSmall"
        android:layout_width="200dp"
        android:layout_height="wrap_content"
        android:id="@+id/newsTitle" />
    <ImageView
        android:src="@android:drawable/ic_menu_gallery"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:id="@+id/newsImage" />
</LinearLayout>

// En NewsList.axml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:minWidth="25px"
    android:minHeight="25px">
    <ListView
        android:minWidth="25px"
        android:minHeight="25px"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/newsListView" />
</LinearLayout>

// En NewsListActivity

 [Activity(Label = "NotiXamarin", MainLauncher = true)]
    public class NewsListActivity : Activity
    {
        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);
        }
    }

    // En NewsListAdapter.cs

    class NewsListAdapter : BaseAdapter<News>
    {
        private Activity _context;
        private List<News> _news;

        public NewsListAdapter(Activity context, List<News> news)
        {
            _context = context;
            _news = news;
        }


        public override News this[int position] => _news[position];

        public override int Count => _news.Count;

        public override long GetItemId(int position)
        {
            return this[position].Id;
        }

        public override View GetView(int position, View convertView, ViewGroup parent)
        {
            var item = this[position];

            if (convertView == null)
            {
                convertView = _context.LayoutInflater.Inflate(Resource.Layout.NewsListRow, null);
            }

            convertView.FindViewById<TextView>(Resource.Id.newsTitle).Text = item.Title;
            var newsImage = convertView.FindViewById<ImageView>(Resource.Id.newsImage);

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

            Picasso.With(_context)
                .Load(imageURL)
                .Placeholder(_context.GetDrawable(Resource.Drawable.Icon))
                .Into(newsImage);

            return convertView;
        }
    }