# Opacity fade

> **Note (legacy): A newer version of the Maps SDK is available**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 A newer version of the SDK is available.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, v11.31.0, 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/maps-example-satellite-opacity-on-zoom-activity-bb0a7577dc0e2824158264ae3e6881ac.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_satellite_opacity_on_zoom`

[View on GitHub](https://github.com/mapbox/mapbox-android-demo/tree/master/MapboxAndroidDemo/src/main/res/layout/activity_satellite_opacity_on_zoom.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"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".examples.styles.SatelliteOpacityOnZoomActivity">

    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/swap_streets_and_satellite_order_toggle_fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="end|bottom"
        android:layout_margin="16dp"
        app:srcCompat="@drawable/ic_swap_horiz_white_24dp"
        tools:backgroundTint="@color/colorAccent" />

    <com.mapbox.mapboxsdk.maps.MapView
        android:id="@+id/mapView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        mapbox:mapbox_cameraTargetLat="30.044"
        mapbox:mapbox_cameraTargetLng="31.235"
        mapbox:mapbox_cameraZoom="10"
        mapbox:mapbox_cameraZoomMin="6"
         />

</FrameLayout>
```

**Java**

Title: `SatelliteOpacityOnZoomActivity.java`

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

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

import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

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

import com.mapbox.mapboxandroiddemo.R;
import com.mapbox.mapboxsdk.Mapbox;
import com.mapbox.mapboxsdk.camera.CameraPosition;
import com.mapbox.mapboxsdk.camera.CameraUpdateFactory;
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.expressions.Expression;
import com.mapbox.mapboxsdk.style.layers.Layer;
import com.mapbox.mapboxsdk.style.layers.PropertyValue;
import com.mapbox.mapboxsdk.style.layers.RasterLayer;
import com.mapbox.mapboxsdk.style.sources.RasterSource;

import static com.mapbox.mapboxsdk.style.expressions.Expression.interpolate;
import static com.mapbox.mapboxsdk.style.expressions.Expression.linear;
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.rasterOpacity;

/**
 * Create an effect of seamlessly fading from one map style to another with runtime styling opacity.
 * Go from the Mapbox Streets style to a satellite photo raster layer as the map camera zooms in.
 * This is similar to how Snap uses Mapbox for Snap Maps.
 */
public class SatelliteOpacityOnZoomActivity extends AppCompatActivity implements
  OnMapReadyCallback {

  private static final String SATELLITE_RASTER_SOURCE_ID = "SATELLITE_RASTER_SOURCE_ID";
  private static final String SATELLITE_RASTER_LAYER_ID = "SATELLITE_RASTER_LAYER_ID";
  private MapView mapView;
  private MapboxMap mapboxMap;
  private boolean satelliteSetToReveal = false;

  private PropertyValue<Expression> expressionRevealingSatellite = rasterOpacity(interpolate(linear(), zoom(),
    stop(15, 0),
    stop(18, 1)
  ));

  private PropertyValue<Expression> expressionRevealingMapboxStreets = rasterOpacity(interpolate(linear(), zoom(),
    stop(12, 1),
    stop(16, 0)
  ));

  @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_satellite_opacity_on_zoom);

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

  @Override
  public void onMapReady(@NonNull final MapboxMap mapboxMap) {
    mapboxMap.setStyle(Style.MAPBOX_STREETS, new Style.OnStyleLoaded() {
      @Override
      public void onStyleLoaded(@NonNull Style style) {

        SatelliteOpacityOnZoomActivity.this.mapboxMap = mapboxMap;

        // Create a data source for the satellite raster image and add the source to the map
        style.addSource(new RasterSource(SATELLITE_RASTER_SOURCE_ID,
          "mapbox://mapbox.satellite", 512));

        // Create a new map layer for the satellite raster images and add the satellite layer to the map.
        // Use runtime styling to adjust the satellite layer's opacity based on the map camera's zoom level
        style.addLayer(
          new RasterLayer(SATELLITE_RASTER_LAYER_ID, SATELLITE_RASTER_SOURCE_ID).withProperties(
            expressionRevealingSatellite));

        // Create a new camera position and animate the map camera to show the fade in/out UI of the satellite layer
        mapboxMap.animateCamera(
          CameraUpdateFactory.newCameraPosition(new CameraPosition.Builder()
            .zoom(19)
            .build()), 9000);

        findViewById(R.id.swap_streets_and_satellite_order_toggle_fab).setOnClickListener(new View.OnClickListener() {
          @Override
          public void onClick(View view) {
            swapStreetsAndSatelliteOrder();
            Toast.makeText(SatelliteOpacityOnZoomActivity.this,
              R.string.zoom_in_and_out_instruction, Toast.LENGTH_SHORT).show();
          }
        });
      }
    });
  }

  private void swapStreetsAndSatelliteOrder() {
    mapboxMap.getStyle(new Style.OnStyleLoaded() {
      @Override
      public void onStyleLoaded(@NonNull Style style) {
        Layer satelliteLayer = style.getLayer(SATELLITE_RASTER_LAYER_ID);
        if (satelliteLayer != null) {
          satelliteLayer.setProperties(
            satelliteSetToReveal ? expressionRevealingSatellite : expressionRevealingMapboxStreets
          );
        }
        satelliteSetToReveal = !satelliteSetToReveal;
      }
    });
  }

  // Add the mapView lifecycle to the activity's lifecycle methods
  @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();
    mapView.onDestroy();
  }

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