# Icon setting based on Feature property

> **Note (legacy): A newer version of the Maps SDK is available**
> 
> This page uses v9.7.1 of the Mapbox Maps SDK. A newer version of the SDK is available. Learn about the latest version, v11.33.0, in the [Maps SDK documentation](https://docs.mapbox.com/android/ja/maps/guides/).

Your browser doesn't support HTML5 video. Open [link to the video](https://docs.mapbox.com/android/ja/android/ja/assets/medias/example-property-icon-determination-activity-4f978703ec7629c3299aa9a5018be720.mp4).

> **Note**
> 
> This example is a part of the [Mapbox Android Demo app](https://github.com/mapbox/mapbox-android-demo). You can find the values for all referenced resources in the [`res`](https://github.com/mapbox/mapbox-android-demo/tree/master/MapboxAndroidDemo/src/main/res) directory. For example, see [`res/values/activity_strings.xml`](https://github.com/mapbox/mapbox-android-demo/tree/master/MapboxAndroidDemo/src/main/res/values/activity_strings.xml) for `R.string.*` references used in this example. The dependencies can be found [here.](https://github.com/mapbox/mapbox-navigation-android-examples/blob/main/app/build.gradle) The examples use View binding. [See setup documention if necessary.](https://developer.android.com/topic/libraries/view-binding)

Title: `activity_dds_property_icon_switch`

[View on GitHub](https://github.com/mapbox/mapbox-android-demo/tree/master/MapboxAndroidDemo/src/main/res/layout/activity_dds_property_icon_switch.xml)

```xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:mapbox="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".examples.dds.PropertyIconDeterminationActivity">

    <com.mapbox.mapboxsdk.maps.MapView
        android:id="@+id/mapView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        mapbox:mapbox_cameraTargetLat="22.75"
        mapbox:mapbox_cameraTargetLng="80.52"
        mapbox:mapbox_cameraZoom="3.05" />

    <androidx.cardview.widget.CardView
        android:layout_width="match_parent"
        android:layout_height="130dp"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginBottom="35dp"
        android:layout_gravity="bottom|center_horizontal">

        <TextView
            android:id="@+id/feature_info"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:textColor="@color/mapboxBlue"
            android:textSize="18sp" />

    </androidx.cardview.widget.CardView>

</FrameLayout>
```

**Java**

Title: `PropertyIconDeterminationActivity.java`

[View on GitHub](https://github.com/mapbox/mapbox-android-demo/tree/master/MapboxAndroidDemo/src/main/java/com/mapbox/mapboxandroiddemo/examples/dds/PropertyIconDeterminationActivity.java)

```java
package com.mapbox.mapboxandroiddemo.examples.dds;

import android.graphics.BitmapFactory;
import android.graphics.PointF;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;

import com.mapbox.geojson.Feature;
import com.mapbox.geojson.FeatureCollection;
import com.mapbox.geojson.Point;
import com.mapbox.mapboxandroiddemo.R;
import com.mapbox.mapboxsdk.Mapbox;
import com.mapbox.mapboxsdk.geometry.LatLng;
import com.mapbox.mapboxsdk.maps.MapView;
import com.mapbox.mapboxsdk.maps.MapboxMap;
import com.mapbox.mapboxsdk.maps.OnMapReadyCallback;
import com.mapbox.mapboxsdk.maps.Style;
import com.mapbox.mapboxsdk.style.layers.Property;
import com.mapbox.mapboxsdk.style.layers.SymbolLayer;
import com.mapbox.mapboxsdk.style.sources.GeoJsonSource;

import java.util.ArrayList;
import java.util.List;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import static com.mapbox.mapboxsdk.style.expressions.Expression.get;
import static com.mapbox.mapboxsdk.style.expressions.Expression.literal;
import static com.mapbox.mapboxsdk.style.expressions.Expression.match;
import static com.mapbox.mapboxsdk.style.expressions.Expression.stop;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.iconAllowOverlap;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.iconAnchor;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.iconImage;

/**
 * Display {@link SymbolLayer} icons on the map and determine the appropriate icon
 * based on a property in each {@link Feature}.
 */
public class PropertyIconDeterminationActivity extends AppCompatActivity implements
  OnMapReadyCallback, MapboxMap.OnMapClickListener {

  private static final String SOURCE_ID = "SOURCE_ID";
  private static final String RED_ICON_ID = "RED_ICON_ID";
  private static final String YELLOW_ICON_ID = "YELLOW_ICON_ID";
  private static final String LAYER_ID = "LAYER_ID";
  private static final String ICON_PROPERTY = "ICON_PROPERTY";
  private MapView mapView;
  private MapboxMap mapboxMap;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // Mapbox access token is configured here. This needs to be called either in your application
    // object or in the same activity which contains the mapview.
    Mapbox.getInstance(this, getString(R.string.access_token));

    // This contains the MapView in XML and needs to be called after the access token is configured.
    setContentView(R.layout.activity_dds_property_icon_switch);

    mapView = findViewById(R.id.mapView);
    mapView.onCreate(savedInstanceState);
    mapView.getMapAsync(this);
  }

  @Override
  public void onMapReady(@NonNull final MapboxMap mapboxMap) {

    mapboxMap.setStyle(new Style.Builder().fromUri("mapbox://styles/mapbox/cj44mfrt20f082snokim4ungi")

      // Add the SymbolLayer icon image to the map style
      .withImage(RED_ICON_ID, BitmapFactory.decodeResource(
        PropertyIconDeterminationActivity.this.getResources(), R.drawable.red_marker))

      .withImage(YELLOW_ICON_ID, BitmapFactory.decodeResource(
        PropertyIconDeterminationActivity.this.getResources(), R.drawable.yellow_marker))

      // Adding a GeoJson source for the SymbolLayer icons.
      .withSource(new GeoJsonSource(SOURCE_ID,
        FeatureCollection.fromFeatures(initCoordinateData())))

      // Adding the actual SymbolLayer to the map style. The match expression will check the
      // ICON_PROPERTY property key and then use the partner value for the actual icon id.
      .withLayer(new SymbolLayer(LAYER_ID, SOURCE_ID)
        .withProperties(iconImage(match(
          get(ICON_PROPERTY), literal(RED_ICON_ID),
          stop(YELLOW_ICON_ID, YELLOW_ICON_ID),
          stop(RED_ICON_ID, RED_ICON_ID))),
          iconAllowOverlap(true),
          iconAnchor(Property.ICON_ANCHOR_BOTTOM))
      ), new Style.OnStyleLoaded() {
          @Override
          public void onStyleLoaded(@NonNull Style style) {

            // Map is set up and the style has loaded. Now you can add additional data or make other map adjustments.

            PropertyIconDeterminationActivity.this.mapboxMap = mapboxMap;

            mapboxMap.addOnMapClickListener(PropertyIconDeterminationActivity.this);

            Toast.makeText(PropertyIconDeterminationActivity.this, R.string.tap_on_marker_instruction,
              Toast.LENGTH_SHORT).show();
          }
      });
  }

  @Override
  public boolean onMapClick(@NonNull LatLng point) {
    return handleClickIcon(mapboxMap.getProjection().toScreenLocation(point));
  }

  /**
   * This method handles click events for SymbolLayer symbols.
   *
   * @param screenPoint the point on screen clicked
   */
  private boolean handleClickIcon(PointF screenPoint) {
    List<Feature> features = mapboxMap.queryRenderedFeatures(screenPoint, LAYER_ID);
    if (!features.isEmpty()) {
      // Show the Feature in the TextView to show that the icon is based on the ICON_PROPERTY key/value
      TextView featureInfoTextView = findViewById(R.id.feature_info);
      featureInfoTextView.setText(features.get(0).toJson());
      return true;
    } else {
      return false;
    }
  }

  private List<Feature> initCoordinateData() {
    Feature singleFeatureOne = Feature.fromGeometry(
      Point.fromLngLat(72.88055419921875,
        19.05822387777432));
    singleFeatureOne.addStringProperty(ICON_PROPERTY, RED_ICON_ID);

    Feature singleFeatureTwo = Feature.fromGeometry(
      Point.fromLngLat(77.22015380859375,
        28.549544699103865));

    singleFeatureTwo.addStringProperty(ICON_PROPERTY, YELLOW_ICON_ID);

    Feature singleFeatureThree = Feature.fromGeometry(
      Point.fromLngLat(88.36647033691406,
        22.52016858599439));

    singleFeatureThree.addStringProperty(ICON_PROPERTY, RED_ICON_ID);

    // Not adding a ICON_PROPERTY property to fourth and fifth features in order to show off the default
    // nature of the match expression used in the example up above
    Feature singleFeatureFour = Feature.fromGeometry(
      Point.fromLngLat(78.42315673828125,
        17.43320034474222));

    Feature singleFeatureFive = Feature.fromGeometry(
      Point.fromLngLat(80.16448974609375,
        12.988500396985364));

    List<Feature> symbolLayerIconFeatureList = new ArrayList<>();
    symbolLayerIconFeatureList.add(singleFeatureOne);
    symbolLayerIconFeatureList.add(singleFeatureTwo);
    symbolLayerIconFeatureList.add(singleFeatureThree);
    symbolLayerIconFeatureList.add(singleFeatureFour);
    symbolLayerIconFeatureList.add(singleFeatureFive);
    return symbolLayerIconFeatureList;
  }

  @Override
  public void onResume() {
    super.onResume();
    mapView.onResume();
  }

  @Override
  protected void onStart() {
    super.onStart();
    mapView.onStart();
  }

  @Override
  protected void onStop() {
    super.onStop();
    mapView.onStop();
  }

  @Override
  public void onPause() {
    super.onPause();
    mapView.onPause();
  }

  @Override
  public void onLowMemory() {
    super.onLowMemory();
    mapView.onLowMemory();
  }

  @Override
  protected void onDestroy() {
    super.onDestroy();
    if (mapboxMap != null) {
      mapboxMap.removeOnMapClickListener(this);
    }
    mapView.onDestroy();
  }

  @Override
  protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    mapView.onSaveInstanceState(outState);
  }
}
```