/// <summary>
/// Retrieves the list of recent checkins.
/// </summary>
private async Task GetRecentCheckinsAsync()
{
_currentListViewMode = ListViewMode.MyCheckins;
bool accessDenied = false;
if (_checkinsCache == null)
{
Title.Text = "Getting Checkins...";
var resourceUri = String.Format("https://api.foursquare.com/v2/users/self/checkins?limit={0}&v={1}",
Settings.QueryLimit,
Constants.ApiVerifiedDate);
try
{
HttpResponseMessage response = await _httpClient.GetAsync(new Uri(resourceUri));
switch (response.StatusCode)
{
case HttpStatusCode.Ok:
var responseBodyAsText = await response.Content.ReadAsStringAsync();
var responseBodyAsJson = JsonObject.Parse(responseBodyAsText);
_checkinsCache = Checkin.ListFromJson(responseBodyAsJson["response"].GetObject());
break;
case HttpStatusCode.Unauthorized: // token was revoked
Logger.Trace(TraceLevel.Error, "User disconnected this app from the Foursquare Settings page: " + response.StatusCode.ToString());
accessDenied = true;
break;
default:
Logger.Trace(TraceLevel.Error, "Failed to get checkins from Foursquare: " + response.StatusCode.ToString());
break;
}
}
catch (UnauthorizedAccessException)
{
accessDenied = true;
}
}
if (accessDenied)
{
Logger.Trace(TraceLevel.Info, "Access denied, deleting state.");
await DeleteStateAsync();
}
if (_checkinsCache != null)
{
Title.Text = _checkinsCache.Count + " Latest Checkins";
ItemsListView.ItemsSource = _checkinsCache;
}
else
{
Title.Text = "Checkins Unavailable";
}
}
public static Checkin FromJson(JsonObject json)
{
var c = new Checkin();
c.UtcTimestamp = new DateTime(1970, 1, 1, 0, 0, 0).AddSeconds((long)json["createdAt"].GetNumber());
c.Venue = Venue.FromJson(json["venue"].GetObject());
return(c);
}
public static List <Checkin> ListFromJson(JsonObject json)
{
var items = json["checkins"].GetObject()["items"].GetArray();
var result = new List <Checkin>();
foreach (var item in items)
{
try
{
var v = Checkin.FromJson(item.GetObject());
result.Add(v);
}
catch (KeyNotFoundException)
{
// If key not found, skip the item
Logger.Trace(TraceLevel.Warn, "Skipping checkin because of missing key");
}
}
return(result);
}