@Override
    public void writeToParcel(@NonNull final Parcel dest, final int flags) {
        dest.writeParcelable(center, flags);
        dest.writeParcelable(bottomLeft, flags);
        dest.writeParcelable(topRight, flags);
    }
Helper class to build Viewports without instanciating too many helper objects
main/src/main/java/cgeo/geocaching/location/Viewport.java