Call API

MainActivity.cs

public class MainActivity : AppCompatActivity
{
    protected override async void OnCreate(Bundle savedInstanceState)
    {
      base.OnCreate(savedInstanceState);
      SetContentView(Resource.Layout.activity_main)
      var textview = FindViewById<TextView>(Resource.Id.textView);
      var apiService = NetworkService.GetApiService();
      await apiService.GetPost()
      .ContinueWith(post =>
      {
        if (post.IsCompleted && post.Status == TaskStatus.RanToCompletion)
        {
           // Get result and update any UI here.
           var post = post.Result;
           textView.Text = post.Title; // For property serialized/deserialized using Newtonsoft.Json
        }
        else if (post.IsFaulted)
        {
          // If any error occurred exception throws.
        }
        else if (post.IsCanceled)
        {
          // Task cancelled
        }
      },TaskScheduler.FromCurrentSynchronizationContext())// execute in main/UI thread.
      .ConfigureAwait(false)// Execute API call on background or worker thread.          
   }
}