[android] Expose "local ideograph font family" in MapSnapshotter::Options

Use local glyph generation in test app's MapSnapshotterActivity.

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/snapshotter/MapSnapshotter.java

@@ -95,6 +95,7 @@ public class MapSnapshotter {
     private LatLngBounds region;
     private CameraPosition cameraPosition;
     private boolean showLogo = true;
+    private String localIdeographFontFamily;
 
     /**
      * @param width  the width of the image
@@ -171,6 +172,22 @@ public class MapSnapshotter {
       return this;
     }
 
+    /**
+     * Set the font family for generating glyphs locally for ideographs in the 'CJK Unified Ideographs'
+     * and 'Hangul Syllables' ranges.
+     * <p>
+     * The font family argument is passed to {@link android.graphics.Typeface#create(String, int)}.
+     * Default system fonts are defined in &#x27;/system/etc/fonts.xml&#x27;
+     *
+     * @param fontFamily font family for local ideograph generation.
+     * @return the mutated {@link Options}
+     */
+    @NonNull
+    public Options withLocalIdeographFontFamily(String fontFamily) {
+      this.localIdeographFontFamily = fontFamily;
+      return this;
+    }
+
     /**
      * @return the width of the image
      */
@@ -214,6 +231,14 @@ public class MapSnapshotter {
     public CameraPosition getCameraPosition() {
       return cameraPosition;
     }
+
+    /**
+     * @return the font family used for locally generating ideographs
+     */
+    public String getLocalIdeographFontFamily() {
+      return localIdeographFontFamily;
+    }
+
   }
 
   /**
@@ -231,7 +256,7 @@ public class MapSnapshotter {
 
     nativeInitialize(this, fileSource, options.pixelRatio, options.width,
       options.height, options.styleUrl, options.styleJson, options.region, options.cameraPosition,
-      options.showLogo, programCacheDir);
+      options.showLogo, programCacheDir, options.localIdeographFontFamily);
   }
 
   /**
@@ -513,7 +538,8 @@ public class MapSnapshotter {
                                          FileSource fileSource, float pixelRatio,
                                          int width, int height, String styleUrl, String styleJson,
                                          LatLngBounds region, CameraPosition position,
-                                         boolean showLogo, String programCacheDir);
+                                         boolean showLogo, String programCacheDir,
+                                         String localIdeographFontFamily);
 
   @Keep
   protected native void nativeStart();