Polygon hole can not show on VectorLayer

[sunshine0576]

when i add "PolygonDrawable " to the VectorLayer
Polygon holes cannot be drawn，Is there a way to solve this problem?，Is my style wrong？

VectorLayer vectorLayer = new VectorLayer(mMap);
Polygon shell =(Polygon) new GeomBuilder()
.point(0, 0)
.point()
.buffer(20)
.get();

    Polygon hole = (Polygon)new GeomBuilder()
            .point(0, 0)
            .point()
            .buffer(10)
            .get();

    Polygon polygon=new GeometryFactory().createPolygon((LinearRing) shell.getExteriorRing(),
            new LinearRing[]{(LinearRing)hole.getExteriorRing()});

    vectorLayer.add(new PolygonDrawable(polygon, defaultStyle()));

[sunshine0576]

[devemux86]

VTM development continues at https://github.com/mapsforge/vtm.

For questions please use our forum.

[devemux86]

Since have not asked in https://github.com/mapsforge/vtm or in forum, I post the answer here.

Depends if JTS geometries are properly constructed, e.g. JTS polygons should have their exterior shell in clockwise direction and their interior holes in counter-clockwise direction.
So can normalize the created JTS polygon to handle that:

polygon.normalize();