public async Task GetDataAsync(string path, Action <string> progress)
{
if (System.IO.File.Exists(path))
{
return;
}
DownloadManager.FileDownloadTask task = null;
string tempFile = null;
if (Plugin.Settings.CrossSettings.Current.Contains("DataDownloadTask"))
{
var previousTask = DownloadManager.FileDownloadTask.FromJson(Plugin.Settings.CrossSettings.Current.GetValueOrDefault("DataDownloadTask", string.Empty));
if (previousTask.IsResumable)
{
task = previousTask;
tempFile = task.Filename;
}
}
if (task == null)
{
progress?.Invoke("Fetching offline data info...");
var portal = await Esri.ArcGISRuntime.Portal.ArcGISPortal.CreateAsync(new Uri("https://www.arcgis.com/sharing/rest")).ConfigureAwait(false);
var item = await Esri.ArcGISRuntime.Portal.PortalItem.CreateAsync(portal, ItemId).ConfigureAwait(false);
progress?.Invoke("Initiating download...");
tempFile = System.IO.Path.GetTempFileName();
task = await DownloadManager.FileDownloadTask.StartDownload(tempFile, item);
string downloadTask = task.ToJson();
Plugin.Settings.CrossSettings.Current.AddOrUpdateValue("DataDownloadTask", task.ToJson());
}
progress?.Invoke("Downloading data...");
if (progress != null)
{
string lastState = "";
task.Progress += (s, e) =>
{
var state = "Downloading data " + (e.HasPercentage ? e.Percentage.ToString() + "%" : e.TotalBytes / 1024 + " kb...");
if (state != lastState)
{
progress?.Invoke(state);
lastState = state;
}
};
}
await task.DownloadAsync();
//AppSettings.Remove("DataDownloadTask");
//if(tempFile.EndsWith(".zip"))
//{ progress?.Invoke("Unpacking data...");
// await UnpackData(tempFile, path); //If zipped
//}
//else
//{
System.IO.File.Move(tempFile, path);
//}
progress?.Invoke("Complete");
}
private static async Task <FileDownloadTask> StartDownload(HttpRequestMessage request, string filename, HttpMessageHandler handler = null)
{
HttpClient client;
if (handler == null)
{
handler = new HttpClientHandler();
}
client = new HttpClient(handler);
var response = await client.SendAsync(request, HttpCompletionOption.ResponseHeadersRead).ConfigureAwait(false);
var content = response.EnsureSuccessStatusCode();
FileDownloadTask result = new FileDownloadTask(filename, request.RequestUri, content, client);
return(result);
}
