nav[aria-label="Primary Navigation"] { padding: 0; & ul { list-style: none; width: 100%; display: flex; flex-direction: row; justify-content: start; align-items: start; gap: 30px; padding: 0; & li { margin: 0; } & ul li { list-style: none; } } }

Offline basemap not loading if internet connection is not available

NiladriBanerjee

Hi All,

We are having an issue regarding the offline basemap. We are able to download the arcgis online base map in our device. using the code given in this forum,

.NET Xamarin gist to download ArcGIS basemap tiles for offline use. · GitHub

However after downloading when we are trying to load the offline map( using the sample code given in this link Offline mapping ideas — Xamarin Forums) from our local storage and it is not loading in the background if we switch off the device internet connection. But surprisingly if we switch on the internet the offline map was loading in the background from the local storage. we are using xamarin forms for android to develop the application. Any help concerning this issue will be highly appreciated.

Thanks,

Niladri Banerjee

GIS Developer

Find more posts tagged with

Accepted answers

All comments

AnttiKajanus1

You could try to use TileCache and see if that makes any difference to you. Btw, I cannot see the code how you are using the TPK

 <SPAN class="comment token">// Add basemaps to the scene</SPAN>
<SPAN class="keyword token">var</SPAN> tileCacheSmallScale <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">TileCache</SPAN><SPAN class="punctuation token">(</SPAN>pathToTheTPKFile<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">var</SPAN> tileLayerSmallScale <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">ArcGISTiledLayer</SPAN><SPAN class="punctuation token">(</SPAN>tileCacheSmallScale<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">var</SPAN> basemap <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">Basemap</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
basemap<SPAN class="punctuation token">.</SPAN>BaseLayers<SPAN class="punctuation token">.</SPAN><SPAN class="token function">Add</SPAN><SPAN class="punctuation token">(</SPAN>tileLayer<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

Make sure that the TPK file is where you are looking it from. I usually use android device manager to check if it is there and the size is what I'm expecting.

Does the basemap and the tile layer inside it loaded correctly?

ChadYoder1

Also, have you confirmed the TPK file is valid and has data? You could open in ArcMap to make sure you can see the tiles.

ChadYoder1

Looks similar to what I have and I'm able to load an offline basemap.

This code works for me, maybe has to do with creating a new Basemap? Or, checking the load status to make sure the layer is loaded?

//Create a new map
EsriMapView.Map = new Map();

//Add the basemap
string basemapPath = Path.Combine (model.FullPath, SettingsManager.BasemapName);
basemapPath = PathHelpers.CleanPath (basemapPath);
if (System.IO.File.Exists(basemapPath)) {
   var basemapLayer = new ArcGISTiledLayer(new Uri(basemapPath));
   if (basemapLayer.LoadStatus == Esri.ArcGISRuntime.LoadStatus.NotLoaded)
      await basemapLayer.LoadAsync ();
   EsriMapView.Map.Basemap.BaseLayers.Add(basemapLayer);
}

You might also want to reload the map, this occurs at the end of my offline map loading:

//Load the map
await EsriMapView.Map.RetryLoadAsync ();

NiladriBanerjee

Hi Chad,

Thanks for your reply. Here is the sample code.

try

{

if (message.SelectedLayers.Count != 0)

{

var offlayer = message.SelectedLayers;

Acr.UserDialogs.UserDialogs.Instance.ShowLoading("Loading Offline Map", Acr.UserDialogs.MaskType.Black);

ArcGISTiledLayer layer = await ShowBaseMapsMenuEditMessage.OffLineMap.LoadTileCache("/storage/emulated/0/SmartMaps/" + âFileNameIS.tpk");

// Create basemap

Basemap basemap = new Basemap();

// Get layers from file

basemap.BaseLayers.Add(layer);

Map = new Map(basemap);

if (layer.LoadStatus != Esri.ArcGISRuntime.LoadStatus.Loaded)

{

Acr.UserDialogs.UserDialogs.Instance.ShowSuccess("Could not load tile cache", 1000);

}

else

{

Acr.UserDialogs.UserDialogs.Instance.ShowSuccess("Tile cache loaded successfully.", 1000);

}

catch (Exception rr)

{

Acr.UserDialogs.UserDialogs.Instance.ShowSuccess("Incourrect format", 1000);

}

Thanks,

Niladri

NiladriBanerjee

Thanks Eric.

ChadYoder1

Could it be that offline basemap is loading, but you can't see it because of the zoom extent and the LOD's downloaded are not included?

You might want to try creating a new Map, and then loading the offline map. This should reset the extent to the area where the offline map is located.

Post some code that shows your workflow when switching to offline mode and we'll be able to give you some more help.

EricBader

Hi Niladri,

I bet the guys here who work more closely with Xamarin could shed some light on the issue:

https://community.esri.com/community/developers/native-app-developers/arcgis-runtime-sdk-for-net

ttilton‌

Join the Conversation

Signed in members can post, follow updates, and more. New here? Register a free account.

Quick Links

Community Help
Find useful guides, FAQs, and documents to help you navigate and make the most of Esri Community.