[android] Polygon holes (#8557)

* add 1 hole support to polygon-related classes

* fix no hole crash and add triangle hole shape example

* add support for multiple holes

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/annotations/Hole.java

@@ -0,0 +1,53 @@
+package com.mapbox.mapboxsdk.annotations;
+
+
+import android.os.Parcel;
+import android.os.Parcelable;
+
+import com.mapbox.mapboxsdk.geometry.LatLng;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Encapsulates a {@link List} of {@link LatLng} points defining a hole
+ */
+public class Hole extends ArrayList<LatLng> implements Parcelable {
+
+  public Hole() {
+    super();
+  }
+
+  /**
+   * Creates a Hole.
+   *
+   * @param holePoints {@link List} list of {@link LatLng} points defining a hole
+   */
+  public Hole(List<LatLng> holePoints) {
+    super(holePoints);
+  }
+
+  protected Hole(Parcel in) {
+    in.readTypedList(this, LatLng.CREATOR);
+  }
+
+  @Override
+  public int describeContents() {
+    return 0;
+  }
+
+  @Override
+  public void writeToParcel(Parcel parcel, int i) {
+    parcel.writeTypedList(this);
+  }
+
+  public static final Parcelable.Creator<Hole> CREATOR = new Parcelable.Creator<Hole>() {
+    public Hole createFromParcel(Parcel in) {
+      return new Hole(in);
+    }
+
+    public Hole[] newArray(int size) {
+      return new Hole[size];
+    }
+  };
+}

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/annotations/Polygon.java

@@ -4,6 +4,9 @@ import android.graphics.Color;
 
 import com.mapbox.mapboxsdk.maps.MapboxMap;
 
+import java.util.ArrayList;
+import java.util.List;
+
 /**
  * Polygon is a geometry annotation that's a closed loop of coordinates.
  */
@@ -11,9 +14,11 @@ public final class Polygon extends BasePointCollection {
 
   private int fillColor = Color.BLACK; // default fillColor is black
   private int strokeColor = Color.BLACK; // default strokeColor is black
+  private List<Hole> holes;
 
   Polygon() {
     super();
+    holes = new ArrayList<>();
   }
 
   /**
@@ -26,7 +31,7 @@ public final class Polygon extends BasePointCollection {
   }
 
   /**
-   * Get the color fo the stroke of the polygon.
+   * Get the color of the stroke of the polygon.
    *
    * @return The color of the stroke.
    */
@@ -34,6 +39,15 @@ public final class Polygon extends BasePointCollection {
     return strokeColor;
   }
 
+  /**
+   * Returns a copy of the holes.
+   *
+   * @return A {@link List} of holes.
+   */
+  public List<Hole> getHoles() {
+    return new ArrayList<>(holes);
+  }
+
   /**
    * Sets the color of the fill region of the polygon.
    *
@@ -54,6 +68,27 @@ public final class Polygon extends BasePointCollection {
     update();
   }
 
+  /**
+   * Sets the holes of this polygon. This method will take a copy of the holes, so further
+   * mutations to holes will have no effect on this polygon.
+   *
+   * @param holes A {@link List} of {@link Hole} points making up the holes.
+   */
+  public void setHoles(List<? extends Hole> holes) {
+    this.holes = new ArrayList<>(holes);
+    update();
+  }
+
+  /**
+   * Add a hole to the polygon.
+   *
+   * @param hole A {@link Hole} hole to be added.
+   */
+  void addHole(Hole hole) {
+    holes.add(hole);
+    update();
+  }
+
   @Override
   void update() {
     MapboxMap mapboxMap = getMapboxMap();

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/annotations/PolygonOptions.java

@@ -30,6 +30,9 @@ public final class PolygonOptions implements Parcelable {
     ArrayList<LatLng> pointsList = new ArrayList<>();
     in.readList(pointsList, LatLng.class.getClassLoader());
     addAll(pointsList);
+    ArrayList<Hole> holes = new ArrayList<>();
+    in.readTypedList(holes, Hole.CREATOR);
+    addAllHoles(holes);
     alpha(in.readFloat());
     fillColor(in.readInt());
     strokeColor(in.readInt());
@@ -56,6 +59,7 @@ public final class PolygonOptions implements Parcelable {
   @Override
   public void writeToParcel(Parcel out, int flags) {
     out.writeList(getPoints());
+    out.writeTypedList(getHoles());
     out.writeFloat(getAlpha());
     out.writeInt(getFillColor());
     out.writeInt(getStrokeColor());
@@ -108,6 +112,43 @@ public final class PolygonOptions implements Parcelable {
     return this;
   }
 
+  /**
+   * Adds a hole to the outline of the polygon being built.
+   *
+   * @param hole {@link Hole} list made up of {@link LatLng} points defining the hole
+   * @return This {@link PolygonOptions} object with the given hole added to the outline.
+   */
+  public PolygonOptions addHole(Hole hole) {
+    polygon.addHole(hole);
+    return this;
+  }
+
+  /**
+   * Adds holes to the outline of the polygon being built.
+   *
+   * @param holes {@link Hole} holes to be added to polygon geometry.
+   * @return This {@link PolygonOptions} object with the given holes added to the outline.
+   */
+  public PolygonOptions addHole(Hole... holes) {
+    for (Hole hole : holes) {
+      addHole(hole);
+    }
+    return this;
+  }
+
+  /**
+   * Adds holes to the outline of the polygon being built.
+   *
+   * @param holes {@link Iterable} list made up of {@link Hole} holes defining the hole geometry
+   * @return This {@link PolygonOptions} object with the given holes added to the outline.
+   */
+  public PolygonOptions addAllHoles(Iterable<Hole> holes) {
+    for (Hole hole : holes) {
+      addHole(hole);
+    }
+    return this;
+  }
+
   /**
    * Set the alpha value of the polyline.
    *
@@ -177,18 +218,33 @@ public final class PolygonOptions implements Parcelable {
     return polygon.getStrokeColor();
   }
 
+  /**
+   * Gets the points set for this {@link PolygonOptions} object.
+   *
+   * @return The list made up of {@link LatLng} points defining the polygon.
+   */
   public List<LatLng> getPoints() {
     // the getter gives us a copy, which is the safe thing to do...
     return polygon.getPoints();
   }
 
+  /**
+   * Gets the holes set for this {@link PolygonOptions} object.
+   *
+   * @return The list made up of {@link List} of {@link LatLng} points defining the holes.
+   */
+  public List<Hole> getHoles() {
+    return polygon.getHoles();
+  }
+
+
   /**
    * Compares this {@link PolygonOptions} object with another {@link PolygonOptions} and
    * determines if their color, alpha, stroke color, and vertices match.
    *
    * @param o Another {@link PolygonOptions} to compare with this object.
-   * @return True if color, alpha, stroke color, and vertices match this {@link PolygonOptions}
-   * object. Else, false.
+   * @return True if color, alpha, stroke color, vertices and holes match this {@link PolygonOptions}
+   * {@link PolygonOptions} object. Else, false.
    */
   @Override
   public boolean equals(Object o) {
@@ -210,7 +266,10 @@ public final class PolygonOptions implements Parcelable {
     if (getStrokeColor() != polygon.getStrokeColor()) {
       return false;
     }
-    return !(getPoints() != null ? !getPoints().equals(polygon.getPoints()) : polygon.getPoints() != null);
+    if (getPoints() != null ? !getPoints().equals(polygon.getPoints()) : polygon.getPoints() != null) {
+      return false;
+    }
+    return !(getHoles() != null ? !getHoles().equals(polygon.getHoles()) : polygon.getHoles() != null);
   }
 
   /**
@@ -228,6 +287,7 @@ public final class PolygonOptions implements Parcelable {
     result = 31 * result + getFillColor();
     result = 31 * result + getStrokeColor();
     result = 31 * result + (getPoints() != null ? getPoints().hashCode() : 0);
+    result = 31 * result + (getHoles() != null ? getHoles().hashCode() : 0);
     return result;
   }
 }