geopackage-sdk/src/main/java/mil/nga/geopackage/extension/style/FeatureStyleExtension.java
public IconRow getIcon(String featureTable, long featureId,
                           GeometryType geometryType) {
        return getIcon(featureTable, featureId, geometryType, true);
    }
public IconRow getIcon(String featureTable, long featureId,
                           GeometryType geometryType) {
        return getIcon(featureTable, featureId, geometryType, true);
    }
Get the icon of the feature, searching in order: feature geometry type
icon, feature default icon, table geometry type icon, table default icon

@param featureTable feature table
@param featureId    feature id
@param geometryType geometry type
@return icon row