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Showing content from https://developers.arcgis.com/documentation/offline-mapping-apps/how-to-build-offline-apps/ below:

How to build an offline app | Documentation

There are two types of offline apps you can build with ArcGIS Maps SDKs for Native Apps:

1. Partially offline apps are suitable if you will have periods of disconnectivity and connectivity or if you want to use online services in the offline app.
2. Fully offline apps are suitable if you will be disconnected at all times or if your data is too large and impractical to transfer over the network.

To learn more and choose a type of offline app, go to Types of offline apps.

Mobile data sources provide your offline app with the data and maps that it needs to function. Examples of mobile data sources are offline maps, offline data, mobile packages, and data files. Different types of offline apps have different options for mobile data sources. You can choose from various mobile data sources that suit your type of offline app.

Partially offline apps support a wider selection of mobile data sources. This type of offline app has network access to download data, such as offline-enabled web maps to generate offline maps or data services to generate offline data.

Fully offline apps have more limited options for mobile data sources. These apps rely primarily on locally stored data, such as mobile packages authored in ArcGIS Pro or data files then sideloaded onto the device.

Refer to the chart below to prepare the correct mobile data source for your offline app.

You can build a partially offline app using offline maps, offline data, mobile packages, or data files. See the chart below to determine which mobile data source fits your app requirements best.

You can build a fully offline app using mobile packages or data files. See the chart below to determine which mobile data source fits your app requirements best.

The general steps to prepare a mobile data source are:

1. Select a type of mobile data source for your offline app.
2. Prepare the data using tools such as ArcGIS Pro, Map Viewer, or the portal.
3. For data hosted in the portal, such as a web map or a feature service, enable it for offline use in the item page.
4. Obtain the item ID to download the data to your device, or export the data to sideload it onto your device.

Learn more about the different types of mobile data sources in Types of mobile data sources.

After preparing a mobile data source, the next step is to create an application with ArcGIS Maps SDKs for Native Apps for your preferred platform. Your application will access the mobile data source you have prepared, and can then be expanded with additional functionalities, such as geocoding or routing.

The following examples show how to access different mobile data sources in partially offline and fully offline apps.

You can use offline maps in a partially offline app only.

ArcGIS Maps SDK for .NET ArcGIS Maps SDK for .NET ArcGIS Maps SDK for Kotlin ArcGIS Maps SDK for Swift ArcGIS Maps SDK for Java ArcGIS Maps SDK for Qt ArcGIS Maps SDK for Flutter

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var portal = await ArcGISPortal.CreateAsync();
var portalItem = await PortalItem.CreateAsync(portal, "YOUR_ITEM_ID"); // Replace with your web map ID
var map = new Map(portalItem);

OfflineMapTask offlineTask = await OfflineMapTask.CreateAsync(map);

GenerateOfflineMapParameters generateParameters =
    await offlineTask.CreateDefaultGenerateOfflineMapParametersAsync(areaOfInterest);

GenerateOfflineMapJob job = offlineTask.GenerateOfflineMap(generateParameters, "path\\to\\map\\directory");

GenerateOfflineMapResult result = await job.GetResultAsync();

if (result.OfflineMap is Map offlineMap)
{
    MainMapView.Map = offlineMap;
}

Learn more in Partially offline apps > Offline maps.

You can use offline data in a partially offline app only.

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MainMapView.Map = new Map(BasemapStyle.ArcGISStreets);
var areaOfInterest = new Esri.ArcGISRuntime.Geometry.Polygon(new [] {
    new MapPoint(-88.153245, 41.778064, SpatialReferences.Wgs84),
    new MapPoint(-88.146708, 41.778870, SpatialReferences.Wgs84),
    new MapPoint(-88.145878, 41.769764, SpatialReferences.Wgs84),
    new MapPoint(-88.153431, 41.770330, SpatialReferences.Wgs84)
});

var featureServiceUri = new Uri("https://services2.arcgis.com/ZQgQTuoyBrtmoGdP/arcgis/rest/services/WaterDistributionNetwork/FeatureServer");
GeodatabaseSyncTask geodatabaseSyncTask = await GeodatabaseSyncTask.CreateAsync(featureServiceUri);

GenerateGeodatabaseParameters gdbGenerateParameters
    = await geodatabaseSyncTask.CreateDefaultGenerateGeodatabaseParametersAsync(areaOfInterest.Extent);
gdbGenerateParameters.ReturnAttachments = false;

GenerateGeodatabaseJob job = geodatabaseSyncTask.GenerateGeodatabase(gdbGenerateParameters, "path\\to\\file.geodatabase");

// Optionally listen for progress changes
job.ProgressChanged += (o,e) => { };

Geodatabase generateResult = await job.GetResultAsync();

MainMapView.Map.OperationalLayers.AddRange(
    generateResult.GeodatabaseFeatureTables.Select(table => new FeatureLayer(table))
  );

MainMapView.SetViewpointGeometryAsync(areaOfInterest, 50);

The example above uses feature service to generate the offline data. You can also use the basemap styles service, vector tile service, or map tile service.

Learn more in Partially offline apps > Offline data.

You can use mobile packages in both partially offline and fully offline apps.

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try
{
    var mobileMapPackage = await MobileMapPackage.OpenAsync(path: "path\\to\\file.mmpk");
    await mobileMapPackage.LoadAsync();
    MainMapView.Map = mobileMapPackage.Maps.First();
}
catch(Exception ex)
{
    // Handle error.
}

Learn more in Fully offline apps > Mobile packages.

You can use data files in both partially offline and fully offline apps.

ArcGIS Maps SDK for .NET ArcGIS Maps SDK for .NET ArcGIS Maps SDK for Kotlin ArcGIS Maps SDK for Swift ArcGIS Maps SDK for Java ArcGIS Maps SDK for Qt ArcGIS Maps SDK for Flutter

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var shapefileTable = new ShapefileFeatureTable("\\path\\to\\shapefile.shp");

var shapefileLayer = new FeatureLayer(shapefileTable);

MainMapView.Map.OperationalLayers.Add(shapefileLayer);

The example above uses a shapefile as a data file. You can also use a mobile geodatabase or other supported data files.

Learn more in Fully offline apps > Data files.

Use Map Viewer and the ArcGIS portal to create an offline-enabled web map.

Use your portal to create an offline map area from an offline-enabled web map.

Use ArcGIS Pro to create a mobile map package.

Download and display an offline map for a custom area of a web map.

Access and display a map from a mobile map package for offline use.

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