如何使用ArcGIS Android运行时保存地图并再次加载

我将学习Arcgis runtime SDK for android，我可以使用示例文档成功地显示地图，但当我将形状文件导入地图时，我不知道如何保存此地图并再次加载它

        ShapefileFeatureTable shapefileFeatureTable = new ShapefileFeatureTable(uri);

        shapefileFeatureTable.loadAsync();
        shapefileFeatureTable.addDoneLoadingListener(() -> {
            if (shapefileFeatureTable.getLoadStatus() == LoadStatus.LOADED) {

                // create a feature layer to display the shapefile
                FeatureLayer shapefileFeatureLayer = new FeatureLayer(shapefileFeatureTable);



                // add the feature layer to the map
                mMapView.getMap().getOperationalLayers().add(shapefileFeatureLayer);

                // zoom the map to the extent of the shapefile
                mMapView.setViewpointAsync(new Viewpoint(shapefileFeatureLayer.getFullExtent()));

            } else {
                String error = "Shapefile feature table failed to load: " + shapefileFeatureTable.getLoadError().toString();
                Toast.makeText(SketcherActivity.this, error, Toast.LENGTH_LONG).show();
                //Log.e(TAG, error);
            }
        });

但是我没有找到任何帮助来保存ShapefileFeatureTable，有人能给我一些帮助吗