From a9b25604b8f91c3b6c51145076ceb20cfb57ff20 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C5=81ukasz=20Paczos?= <lukas.paczos@gmail.com>
Date: Tue, 1 May 2018 12:26:12 +0200
Subject: [android] - expressions example

---
 .../activity/maplayout/SimpleMapActivity.java      | 74 ++++++++++++++++++++++
 1 file changed, 74 insertions(+)

diff --git a/platform/android/MapboxGLAndroidSDKTestApp/src/main/java/com/mapbox/mapboxsdk/testapp/activity/maplayout/SimpleMapActivity.java b/platform/android/MapboxGLAndroidSDKTestApp/src/main/java/com/mapbox/mapboxsdk/testapp/activity/maplayout/SimpleMapActivity.java
index 8f8a5af3cc..31c614372a 100644
--- a/platform/android/MapboxGLAndroidSDKTestApp/src/main/java/com/mapbox/mapboxsdk/testapp/activity/maplayout/SimpleMapActivity.java
+++ b/platform/android/MapboxGLAndroidSDKTestApp/src/main/java/com/mapbox/mapboxsdk/testapp/activity/maplayout/SimpleMapActivity.java
@@ -3,9 +3,27 @@ package com.mapbox.mapboxsdk.testapp.activity.maplayout;
 import android.os.Bundle;
 import android.support.v7.app.AppCompatActivity;
 
+import com.mapbox.geojson.Feature;
+import com.mapbox.geojson.FeatureCollection;
+import com.mapbox.geojson.Point;
+import com.mapbox.mapboxsdk.camera.CameraUpdateFactory;
+import com.mapbox.mapboxsdk.geometry.LatLng;
 import com.mapbox.mapboxsdk.maps.MapView;
+import com.mapbox.mapboxsdk.style.layers.SymbolLayer;
+import com.mapbox.mapboxsdk.style.sources.GeoJsonSource;
 import com.mapbox.mapboxsdk.testapp.R;
 
+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.linear;
+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.expressions.Expression.zoom;
+import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.iconAllowOverlap;
+import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.iconImage;
+import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.iconSize;
+
 /**
  * Test activity showcasing a simple MapView without any MapboxMap interaction.
  */
@@ -20,6 +38,62 @@ public class SimpleMapActivity extends AppCompatActivity {
 
     mapView = (MapView) findViewById(R.id.mapView);
     mapView.onCreate(savedInstanceState);
+    mapView.getMapAsync(mapboxMap -> {
+      Point point1 = Point.fromLngLat(2.176550, 41.377432);
+      Feature feature1 = Feature.fromGeometry(point1);
+      feature1.addStringProperty("type", "restaurant");
+
+      Point point2 = Point.fromLngLat(2.169974, 41.374830);
+      Feature feature2 = Feature.fromGeometry(point2);
+      feature2.addStringProperty("type", "other");
+
+      FeatureCollection featureCollection = FeatureCollection.fromFeatures(new Feature[] {feature1, feature2});
+
+      GeoJsonSource source = new GeoJsonSource("source", featureCollection);
+      mapboxMap.addSource(source);
+
+      SymbolLayer layer = new SymbolLayer("layer", "source");
+      layer.setProperties(
+        iconAllowOverlap(true),
+        iconImage(
+          match(
+            get("type"), //argument
+            literal("restaurant"), literal("restaurant-15"), //first case
+            literal("cafe"), literal("cafe-15"), //second case
+            literal("circle-stroked-15") //default
+          )
+        ),
+        iconSize(
+          interpolate(linear(), zoom(), //At the moment, Expression.zoom() can only be used as a top property, that's why we need to duplicate some code
+            stop(8, match(
+              get("type"),
+              literal("other"), literal(0f),
+              literal(1f)
+            )),
+            stop(14, match(
+              get("type"),
+              literal("other"), literal(2f),
+              literal(1f)
+            ))
+          )
+        )
+      );
+      mapboxMap.addLayer(layer);
+
+      mapboxMap.addOnMapClickListener(point -> {
+        if (feature1.getStringProperty("type").equals("restaurant")) {
+          feature1.addStringProperty("type", "cafe");
+        } else {
+          feature1.addStringProperty("type", "restaurant");
+        }
+        source.setGeoJson(featureCollection);
+      });
+
+      mapboxMap.moveCamera(CameraUpdateFactory.newLatLngZoom(
+        new LatLng((point1.latitude() + point2.latitude()) / 2, (point1.longitude() + point2.longitude()) / 2),
+        11
+      ));
+    });
   }
 
   @Override
-- 
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