# Style circles categorically

> **Note (legacy): A newer version of the Maps SDK is available**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 A newer version of the SDK is available.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, v11.29.0, in the [Maps SDK documentation](https://docs.mapbox.com/android/maps/guides/).

![Using a categorical circle-color property function for a visualization.](https://docs.mapbox.com/android/assets/ideal-img/maps-examples-style-circles-categorically.24a7f00.480.png)

> **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_style_circles_categorically`

[View on GitHub](https://github.com/mapbox/mapbox-android-demo/tree/master/MapboxAndroidDemo/src/main/res/layout/activity_dds_style_circles_categorically.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.basics.SimpleMapViewActivity">

    <com.mapbox.mapboxsdk.maps.MapView
        android:id="@+id/mapView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        mapbox:mapbox_cameraTargetLat="37.753574"
        mapbox:mapbox_cameraTargetLng="-122.447303"
        mapbox:mapbox_cameraZoom="12" />

</FrameLayout>
```

**Java**

Title: `StyleCirclesCategoricallyActivity.java`

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

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

import android.os.Bundle;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import com.mapbox.mapboxandroiddemo.R;
import com.mapbox.mapboxsdk.Mapbox;
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.CircleLayer;
import com.mapbox.mapboxsdk.style.sources.VectorSource;

import static com.mapbox.mapboxsdk.style.expressions.Expression.exponential;
import static com.mapbox.mapboxsdk.style.expressions.Expression.get;
import static com.mapbox.mapboxsdk.style.expressions.Expression.interpolate;
import static com.mapbox.mapboxsdk.style.expressions.Expression.match;
import static com.mapbox.mapboxsdk.style.expressions.Expression.rgb;
import static com.mapbox.mapboxsdk.style.expressions.Expression.stop;
import static com.mapbox.mapboxsdk.style.expressions.Expression.zoom;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.circleColor;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.circleRadius;

/**
 * Use data-driven styling to set circles' colors based on imported vector data.
 */
public class StyleCirclesCategoricallyActivity extends AppCompatActivity {

  private MapView mapView;

  @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_style_circles_categorically);

    mapView = findViewById(R.id.mapView);
    mapView.onCreate(savedInstanceState);
    mapView.getMapAsync(new OnMapReadyCallback() {
      @Override
      public void onMapReady(@NonNull final MapboxMap mapboxMap) {

        mapboxMap.setStyle(Style.LIGHT, new Style.OnStyleLoaded() {
          @Override
          public void onStyleLoaded(@NonNull Style style) {
            style.addSource(new VectorSource(
                "ethnicity-source",
                "http://api.mapbox.com/v4/examples.8fgz4egr.json?access_token=" + Mapbox.getAccessToken()
            ));

            CircleLayer circleLayer = new CircleLayer("population", "ethnicity-source");
            circleLayer.setSourceLayer("sf2010");
            circleLayer.withProperties(
              circleRadius(
                interpolate(
                  exponential(1.75f),
                  zoom(),
                  stop(12, 2f),
                  stop(22, 180f)
                )),
              circleColor(
                match(get("ethnicity"), rgb(0, 0, 0),
                  stop("white", rgb(251, 176, 59)),
                  stop("Black", rgb(34, 59, 83)),
                  stop("Hispanic", rgb(229, 94, 94)),
                  stop("Asian", rgb(59, 178, 208)),
                  stop("Other", rgb(204, 204, 204)))));

            style.addLayer(circleLayer);
          }
        });
      }
    });
  }

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

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

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

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

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

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

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

**Kotlin**

Title: `StyleCirclesCategoricallyActivity.kt`

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

```kt
package com.mapbox.mapboxandroiddemo.examples.dds

import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import com.mapbox.mapboxandroiddemo.R
import com.mapbox.mapboxsdk.Mapbox
import com.mapbox.mapboxsdk.maps.Style
import com.mapbox.mapboxsdk.style.expressions.Expression.*
import com.mapbox.mapboxsdk.style.layers.CircleLayer
import com.mapbox.mapboxsdk.style.layers.PropertyFactory.circleColor
import com.mapbox.mapboxsdk.style.layers.PropertyFactory.circleRadius
import com.mapbox.mapboxsdk.style.sources.VectorSource
import kotlinx.android.synthetic.main.activity_dds_kotlin_style_circles_categorically.*

/**
 * Kotlin example of using data-driven styling to set circles' colors based on imported vector data.
 */
class KotlinStyleCirclesCategoricallyActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        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_kotlin_style_circles_categorically)

        mapView.onCreate(savedInstanceState)
        mapView.getMapAsync { mapboxMap ->

            mapboxMap.setStyle(Style.LIGHT) {
                val vectorSource = VectorSource(
                        "ethnicity-source",
                        "http://api.mapbox.com/v4/examples.8fgz4egr.json?access_token=" + Mapbox.getAccessToken()!!
                )
                it.addSource(vectorSource)

                val circleLayer = CircleLayer("population", "ethnicity-source")
                circleLayer.sourceLayer = "sf2010"
                circleLayer.withProperties(
                        circleRadius(
                                interpolate(
                                        exponential(1.75f),
                                        zoom(),
                                        stop(12, 2f),
                                        stop(22, 180f)
                                )),
                        circleColor(
                                match(get("ethnicity"), rgb(0, 0, 0),
                                        stop("white", rgb(251, 176, 59)),
                                        stop("Black", rgb(34, 59, 83)),
                                        stop("Hispanic", rgb(229, 94, 94)),
                                        stop("Asian", rgb(59, 178, 208)),
                                        stop("Other", rgb(204, 204, 204)))))

                it.addLayer(circleLayer)
            }
        }
    }

    override fun onStart() {
        super.onStart()
        mapView.onStart()
    }

    public override fun onResume() {
        super.onResume()
        mapView.onResume()
    }

    public override fun onPause() {
        super.onPause()
        mapView.onPause()
    }

    override fun onStop() {
        super.onStop()
        mapView.onStop()
    }

    override fun onLowMemory() {
        super.onLowMemory()
        mapView.onLowMemory()
    }

    override fun onDestroy() {
        super.onDestroy()
        mapView.onDestroy()
    }

    override fun onSaveInstanceState(outState: Bundle) {
        super.onSaveInstanceState(outState)
        mapView.onSaveInstanceState(outState)
    }
}
```