[android] Add Grid source sample for Custom Geometry Source

platform/android/MapboxGLAndroidSDKTestApp/src/main/AndroidManifest.xml

@@ -595,7 +595,17 @@
                 android:name="android.support.PARENT_ACTIVITY"
                 android:value=".activity.FeatureOverviewActivity"/>
         </activity>
-
+        <activity
+            android:name=".activity.style.GridSourceActivity"
+            android:label="@string/title_activity_grid_source"
+            android:description="@string/description_grid_source">
+            <meta-data
+                android:name="@string/category"
+                android:value="@string/category_style"/>
+            <meta-data
+                android:name="android.support.PARENT_ACTIVITY"
+                android:value=".activity.FeatureOverviewActivity"/>
+        </activity>
         <!-- Features -->
         <activity
             android:name=".activity.feature.QueryRenderedFeaturesPropertiesActivity"

platform/android/MapboxGLAndroidSDKTestApp/src/main/java/com/mapbox/mapboxsdk/testapp/activity/style/GridSourceActivity.java

@@ -0,0 +1,151 @@
+package com.mapbox.mapboxsdk.testapp.activity.style;
+
+import android.graphics.Color;
+import android.os.Bundle;
+import android.support.annotation.NonNull;
+import android.support.v7.app.AppCompatActivity;
+
+import com.mapbox.mapboxsdk.geometry.LatLngBounds;
+import com.mapbox.mapboxsdk.maps.MapView;
+import com.mapbox.mapboxsdk.maps.MapboxMap;
+import com.mapbox.mapboxsdk.maps.OnMapReadyCallback;
+import com.mapbox.mapboxsdk.style.layers.LineLayer;
+import com.mapbox.mapboxsdk.style.sources.CustomGeometrySource;
+import com.mapbox.mapboxsdk.style.sources.GeometryTileProvider;
+import com.mapbox.mapboxsdk.testapp.R;
+import com.mapbox.services.commons.geojson.Feature;
+import com.mapbox.services.commons.geojson.FeatureCollection;
+import com.mapbox.services.commons.geojson.MultiLineString;
+import com.mapbox.services.commons.models.Position;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.lineColor;
+
+/**
+ * Test activity showcasing using CustomGeometrySource to create a grid overlay on the map.
+ */
+public class GridSourceActivity extends AppCompatActivity implements OnMapReadyCallback {
+
+  private static final String ID_GRID_SOURCE = "grid_source";
+  private static final String ID_GRID_LAYER = "grid_layer";
+
+  private MapView mapView;
+  private MapboxMap mapboxMap;
+
+  /**
+   * Implementation of GeometryTileProvider that returns features representing a zoom-dependent
+   * grid.
+   */
+  static class GridProvider implements GeometryTileProvider {
+    public FeatureCollection getFeaturesForBounds(LatLngBounds bounds, int zoom) {
+      List<Feature> features = new ArrayList<>();
+      double gridSpacing;
+      if (zoom >= 13) {
+        gridSpacing = 0.01;
+      } else if (zoom >= 11) {
+        gridSpacing = 0.05;
+      } else if (zoom == 10) {
+        gridSpacing = .1;
+      } else if (zoom == 9) {
+        gridSpacing = 0.25;
+      } else if (zoom == 8) {
+        gridSpacing = 0.5;
+      } else if (zoom >= 6) {
+        gridSpacing = 1;
+      } else if (zoom == 5) {
+        gridSpacing = 2;
+      } else if (zoom >= 4) {
+        gridSpacing = 5;
+      } else if (zoom == 2) {
+        gridSpacing = 10;
+      } else {
+        gridSpacing = 20;
+      }
+
+      List gridLines = new ArrayList();
+      for (double y = Math.ceil(bounds.getLatNorth() / gridSpacing) * gridSpacing;
+           y >= Math.floor(bounds.getLatSouth() / gridSpacing) * gridSpacing; y -= gridSpacing) {
+        gridLines.add(Arrays.asList(Position.fromCoordinates(bounds.getLonWest(), y),
+          Position.fromCoordinates(bounds.getLonEast(), y)));
+      }
+      features.add(Feature.fromGeometry(MultiLineString.fromCoordinates(gridLines)));
+
+      gridLines = new ArrayList();
+      for (double x = Math.floor(bounds.getLonWest() / gridSpacing) * gridSpacing;
+           x <= Math.ceil(bounds.getLonEast() / gridSpacing) * gridSpacing; x += gridSpacing) {
+        gridLines.add(Arrays.asList(Position.fromCoordinates(x, bounds.getLatSouth()),
+          Position.fromCoordinates(x, bounds.getLatNorth())));
+      }
+      features.add(Feature.fromGeometry(MultiLineString.fromCoordinates(gridLines)));
+
+      return FeatureCollection.fromFeatures(features);
+    }
+  }
+
+  @Override
+  protected void onCreate(Bundle savedInstanceState) {
+    super.onCreate(savedInstanceState);
+    setContentView(R.layout.activity_grid_source);
+
+    mapView = (MapView) findViewById(R.id.mapView);
+    mapView.onCreate(savedInstanceState);
+    mapView.getMapAsync(this);
+  }
+
+  @Override
+  public void onMapReady(@NonNull final MapboxMap map) {
+    mapboxMap = map;
+
+    // add source
+    CustomGeometrySource source = new CustomGeometrySource(ID_GRID_SOURCE, new GridProvider());
+    mapboxMap.addSource(source);
+
+    // add layer
+    LineLayer layer = new LineLayer(ID_GRID_LAYER, ID_GRID_SOURCE);
+    layer.setProperties(
+      lineColor(Color.parseColor("#000000"))
+    );
+
+    mapboxMap.addLayer(layer);
+  }
+
+  @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
+  protected void onDestroy() {
+    super.onDestroy();
+    mapView.onDestroy();
+  }
+
+  @Override
+  protected void onSaveInstanceState(Bundle outState) {
+    super.onSaveInstanceState(outState);
+    mapView.onSaveInstanceState(outState);
+  }
+
+}

platform/android/MapboxGLAndroidSDKTestApp/src/main/res/layout/activity_grid_source.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+                xmlns:app="http://schemas.android.com/apk/res-auto"
+                android:layout_width="match_parent"
+                android:layout_height="match_parent"
+                android:orientation="vertical">
+
+    <com.mapbox.mapboxsdk.maps.MapView
+        android:id="@id/mapView"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        app:mapbox_cameraTargetLat="41.9567"
+        app:mapbox_cameraTargetLng="-78.6430"
+        app:mapbox_cameraZoom="5"
+        app:mapbox_styleUrl="@string/mapbox_style_mapbox_streets"/>
+
+</RelativeLayout>

platform/android/MapboxGLAndroidSDKTestApp/src/main/res/values/descriptions.xml

@@ -43,7 +43,7 @@
     <string name="description_query_rendered_feature_properties_point">Query rendered feature properties on click</string>
     <string name="description_query_rendered_features_box_count">Count all rendered features in box</string>
     <string name="description_query_rendered_features_box_symbol_count">Count all rendered symbols in box</string>
-    <string name="description_query_rendered_features_box_highlight">Hightligh buildings in box</string>
+    <string name="description_query_rendered_features_box_highlight">Highlight buildings in box</string>
     <string name="description_query_source_features">Query source for features</string>
     <string name="description_simple_map">Shows a simple map</string>
     <string name="description_map_change">Logs map change events to Logcat</string>
@@ -67,4 +67,5 @@
     <string name="description_textureview_debug">Use TextureView to render the map</string>
     <string name="description_textureview_resize">Resize a map rendered on a TextureView</string>
     <string name="description_textureview_animate">Animate a map rendered on a TextureView</string>
+    <string name="description_grid_source">Example Custom Geometry Source</string>
 </resources>

platform/android/MapboxGLAndroidSDKTestApp/src/main/res/values/strings.xml

@@ -1,4 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
     <string name="app_name">Mapbox Android SDK TestApp</string>
+    <string name="title_activity_grid_source">Grid Source</string>
 </resources>