ExportTileCacheJob never starts

CalebPourchot — Wed, 15 Feb 2017 20:12:47 GMT

I'm using the .Net runtime sdk (v.100) for Xamarin Android. I'm trying to download tiles as a .tpk for offline use by my mobile app.

I've managed to use the AuthenticationManager to give me a token for my app. I can successfully create the ExportTileCacheTask and create the ExportTileCacheJob by calling ExportTileCache on the ExportTileCacheTask, but the status of the job never seems to change. When I check the job status immediately after the call to ExportTileCache, it is "NotStarted" and the ServerId = "". I have a breakpoint on my ExportJob_JobChanged handler and it never gets hit no matter how long I wait.

Any ideas? Code below:

var serviceUri = new Uri("https://tiledbasemaps.arcgis.com/arcgis/rest/services/World_Imagery/MapServer");
var tokenUri = new Uri("https://www.arcgis.com/sharing/rest");

try
{
var serverInfo = new ServerInfo
{
ServerUri = tokenUri,
TokenAuthenticationType = TokenAuthenticationType.OAuthClientCredentials,
OAuthClientInfo = new OAuthClientInfo { ClientId = MYCLIENTID, ClientSecret = MYCLIENTSECRET) },
};

AuthenticationManager.Current.RegisterServer(serverInfo);

var cred = await AuthenticationManager.Current.GenerateCredentialAsync(tokenUri, new GenerateTokenOptions { });

var exportTask = await ExportTileCacheTask.CreateAsync(serviceUri, cred);

var exportParams = await exportTask.CreateDefaultExportTileCacheParametersAsync(aoi, 50000, 10000);

job = exportTask.ExportTileCache(exportParams, localFilePath);

job.JobChanged += ExportJob_JobChanged;
}
catch (Exception e)
{
e.ToString();
}

Re: ExportTileCacheJob never starts

CalebPourchot — Mon, 27 Feb 2017 21:58:09 GMT

Apparently the tooltip documentation on ExportTileCache is misleading. It does not, in fact, Start and return an ExportTileCacheJob. You must call Start() on the job to start it.

I finally found java documentation of the class that mentioned this.https://developers.arcgis.com/android/latest/api-reference/reference/com/esri/arcgisruntime/tasks/tilecache/ExportTileCacheJob.html

After calling Start(), the JobChanged events fired as expected and I was able to successfully download a .tpk file.

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ExportTileCacheJob never starts

Re: ExportTileCacheJob never starts