[android] #352 - basic setup

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/geojson/Feature.java

@@ -0,0 +1,8 @@
+package com.mapbox.mapboxsdk.geojson;
+
+/**
+ *
+ */
+public class Feature {
+
+}

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/maps/MapboxMap.java

@@ -2,6 +2,7 @@
 
 import android.content.Context;
 import android.graphics.Bitmap;
+import android.graphics.PointF;
 import android.location.Location;
 import android.os.SystemClock;
 import android.support.annotation.FloatRange;
@@ -19,6 +20,7 @@
 import com.mapbox.mapboxsdk.annotations.Annotation;
 import com.mapbox.mapboxsdk.annotations.BaseMarkerOptions;
 import com.mapbox.mapboxsdk.annotations.BaseMarkerViewOptions;
+import com.mapbox.mapboxsdk.geojson.Feature;
 import com.mapbox.mapboxsdk.annotations.Icon;
 import com.mapbox.mapboxsdk.annotations.IconFactory;
 import com.mapbox.mapboxsdk.annotations.InfoWindow;
@@ -1710,6 +1712,20 @@ public void snapshot(@NonNull SnapshotReadyCallback callback) {
         mMapView.snapshot(callback, null);
     }
 
+    /**
+     * Queries the map for rendered features
+     *
+     * @param coordinates the point to query
+     * @param layerIds    optionally - only query these layers
+     * @return the list of feature
+     */
+    @UiThread
+    @NonNull
+    public List<Feature> queryRenderedFeatures(@NonNull PointF coordinates, @Nullable String... layerIds) {
+        return mMapView.getNativeMapView().queryRenderedFeatures(coordinates, layerIds);
+    }
+
+
     //
     // Interfaces
     //

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/maps/NativeMapView.java

@@ -9,6 +9,7 @@
 import android.support.annotation.Nullable;
 import android.view.Surface;
 
+import com.mapbox.mapboxsdk.geojson.Feature;
 import com.mapbox.mapboxsdk.annotations.Icon;
 import com.mapbox.mapboxsdk.annotations.Marker;
 import com.mapbox.mapboxsdk.annotations.Polygon;
@@ -21,6 +22,8 @@
 import com.mapbox.mapboxsdk.style.layers.NoSuchLayerException;
 import com.mapbox.mapboxsdk.style.sources.Source;
 
+import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.List;
 
 // Class that wraps the native methods for convenience
@@ -42,6 +45,8 @@ final class NativeMapView {
     // Used for callbacks
     private MapView mMapView;
 
+    private final float pixelRatio;
+
     //
     // Static methods
     //
@@ -63,7 +68,7 @@ public NativeMapView(MapView mapView) {
         // the system
         String cachePath = dataPath;
 
-        float pixelRatio = context.getResources().getDisplayMetrics().density;
+        pixelRatio = context.getResources().getDisplayMetrics().density;
         String apkPath = context.getPackageCodePath();
         int availableProcessors = Runtime.getRuntime().availableProcessors();
         ActivityManager.MemoryInfo memoryInfo = new ActivityManager.MemoryInfo();
@@ -501,6 +506,14 @@ public void removeSource(@NonNull String sourceId) {
         nativeRemoveSource(mNativeMapViewPtr, sourceId);
     }
 
+    // Feature querying
+
+    @NonNull
+    public List<Feature> queryRenderedFeatures(PointF coordinates, String... layerIds) {
+        Feature[] features = nativeQueryRenderedFeatures(mNativeMapViewPtr, coordinates.x / pixelRatio, coordinates.y / pixelRatio, layerIds);
+        return features != null ? Arrays.asList(features) : new ArrayList<Feature>();
+    }
+
     public void scheduleTakeSnapshot() {
         nativeScheduleTakeSnapshot(mNativeMapViewPtr);
     }
@@ -696,4 +709,6 @@ private native void nativeSetVisibleCoordinateBounds(long mNativeMapViewPtr, Lat
     private native long nativeUpdatePolyline(long nativeMapviewPtr, long polylineId, Polyline polyline);
 
     private native void nativeScheduleTakeSnapshot(long nativeMapViewPtr);
+
+    private native Feature[] nativeQueryRenderedFeatures(long nativeMapViewPtr, float x, float y, String[] layerIds);
 }