Amend resource location (#801)

real_time/add-custom-dynamic-entity-data-source/settings.gradle

@@ -6,3 +6,23 @@ pluginManagement {
 }
 
 rootProject.name = 'add-custom-dynamic-entity-data-source'
+
+// download sample data
+def ant = new groovy.util.AntBuilder()
+
+if (!file("./samples-data").exists()) {
+    file("./samples-data/real_time").mkdirs()
+
+    // get the json file
+    ant.get(
+            src: "https://arcgisruntime.maps.arcgis.com/sharing/rest/content/items/1f52d04a8dec40f78fcc414e020b2175/data",
+            dest: file("./data.zip")
+    )
+    ant.unzip(
+            src: file("./data.zip"),
+            dest: file("./samples-data/real_time")
+    )
+
+    delete file("./data.zip")
+
+}

real_time/add-custom-dynamic-entity-data-source/src/main/java/com/esri/samples/add_custom_dynamic_entity_data_source/AddCustomDynamicEntityDataSourceSample.java

@@ -16,6 +16,7 @@
 
 package com.esri.samples.add_custom_dynamic_entity_data_source;
 
+import java.io.File;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
@@ -71,8 +72,8 @@ public void start(Stage stage) {
     // set the initial viewpoint
     mapView.setViewpoint(new Viewpoint(new Point(-123.657, 47.984, SpatialReferences.getWgs84()), 3e6));
 
-    // a JSON file (stored as a resource) with observations for use as the custom data source
-    var resource = getClass().getResource("/add_custom_dynamic_entity_data_source/AIS_MarineCadastre_SelectedVessels_CustomDataSource.json").getPath();
+    // a JSON file with observations for use as the custom data source
+    var resource = new File(System.getProperty("data.dir"), "./samples-data/real_time/AIS_MarineCadastre_SelectedVessels_CustomDataSource.json").getPath();
 
     // create a custom data source implementation of a DynamicEntityDataSource with a data source,
     // an entity id field name (a unique identifier for each entity), and an update delay