Symbolize shapefile

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Sample viewer app

Display a shapefile with custom symbology.

Image of symbolize shapefile

Use case

Feature layers created from shapefiles do not possess any rendering information, and will be assigned with a default symbology. You can apply custom styling to ensure that the content is visible and usable in the context of a specific map. For example, you could use this to visually differentiate between features originating from two different shapefiles, by applying a blue color to one, and a red color to the other.

How to use the sample

Pan and zoom around the map to view the symbology renderer set to the feature layer created from the shapefile.

How it works

  1. Create a ShapefileFeatureTable, providing the path to a shapefile.
  2. Create a FeatureLayer from a ShapeFileFeatureTable.
  3. Create a SimpleRenderer to override the default symbology. The simple renderer takes a symbol and applies that to all features in a layer.
  4. Apply the renderer to the FeatureLayer by setting the renderer.

Relevant API

  • FeatureLayer
  • ShapefileFeatureTable
  • SimpleFillSymbol
  • SimpleLineSymbol
  • SimpleRenderer

Offline Data

  1. Download the data from ArcGIS Online.
  2. Extract the contents of the downloaded zip file to disk.
  3. Open your command prompt and navigate to the folder where you extracted the contents of the data from step 1.
  4. Push the data into the scoped storage of the sample app: adb push Aurora_CO_shp/. /Android/data/com.esri.arcgisruntime.sample.symbolizeshapefile/files

About the data

This sample displays a shapefile containing subdivisions in Aurora, CO.

Additional information

While shapefiles contain no rendering information, other data sources such as Service Feature Tables or Geodatabase Feature Tables can contain such information. As a result, the rendering properties of the other data sources can be pre-defined by the author.

Tags

package, shape file, shapefile, symbology, visualization

Sample Code

MainActivity.java
                                                                                                   
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/* Copyright 2017 Esri
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

package com.esri.arcgisruntime.sample.symbolizeshapefile;

import android.graphics.Color;
import android.os.Bundle;

import androidx.appcompat.app.AppCompatActivity;
import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
import com.esri.arcgisruntime.data.ShapefileFeatureTable;
import com.esri.arcgisruntime.geometry.Point;
import com.esri.arcgisruntime.geometry.SpatialReference;
import com.esri.arcgisruntime.layers.FeatureLayer;
import com.esri.arcgisruntime.mapping.ArcGISMap;
import com.esri.arcgisruntime.mapping.BasemapStyle;
import com.esri.arcgisruntime.mapping.Viewpoint;
import com.esri.arcgisruntime.mapping.view.MapView;
import com.esri.arcgisruntime.symbology.SimpleFillSymbol;
import com.esri.arcgisruntime.symbology.SimpleLineSymbol;
import com.esri.arcgisruntime.symbology.SimpleRenderer;

public class MainActivity extends AppCompatActivity {

  private MapView mMapView;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    // authentication with an API key or named user is required to access basemaps and other
    // location services
    ArcGISRuntimeEnvironment.setApiKey(BuildConfig.API_KEY);

    // inflate MapView from layout
    mMapView = findViewById(R.id.mapView);
    // create a map with the BasemapType topographic
    ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC);
    // set the map to be displayed in this view
    mMapView.setMap(map);

    // set an initial viewpoint
    Point point = new Point(-11662054, 4818336, SpatialReference.create(3857));
    Viewpoint viewpoint = new Viewpoint(point, 200000);
    mMapView.setViewpoint(viewpoint);

    // create a shapefile feature table from the local data
    ShapefileFeatureTable shapefileFeatureTable = new ShapefileFeatureTable(
        getExternalFilesDir(null) + getString(R.string.subdivisions_shp));

    // use the shapefile feature table to create a feature layer
    FeatureLayer featureLayer = new FeatureLayer(shapefileFeatureTable);

    // create the Symbol
    SimpleLineSymbol lineSymbol = new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, Color.RED, 1.0f);
    SimpleFillSymbol fillSymbol = new SimpleFillSymbol(SimpleFillSymbol.Style.SOLID, Color.YELLOW, lineSymbol);

    // create the Renderer
    SimpleRenderer renderer = new SimpleRenderer(fillSymbol);

    // set the Renderer on the Layer
    featureLayer.setRenderer(renderer);

    // add the feature layer to the map
    map.getOperationalLayers().add(featureLayer);
  }

  @Override
  protected void onPause() {
    mMapView.pause();
    super.onPause();
  }

  @Override
  protected void onResume() {
    super.onResume();
    mMapView.resume();
  }

  @Override
  protected void onDestroy() {
    mMapView.dispose();
    super.onDestroy();
  }
}

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