arcgis andriod GeometryEngine使用

 intersectionMenuItem.setChecked(true);
      showGeometry(GeometryEngine.intersection(inputPolygon1, inputPolygon2));
      return true;
    }
    else if (itemId == R.id.action_union) {
      unionMenuItem.setChecked(true);
      showGeometry(GeometryEngine.union(inputPolygon1, inputPolygon2));
      return true;
    }
    else if (itemId == R.id.action_difference) {
      differenceMenuItem.setChecked(true);
      // note that the difference method gives different results depending on the order of input geometries
      showGeometry(GeometryEngine.difference(inputPolygon1, inputPolygon2));
      return true;
    }
    else if (itemId == R.id.action_symmetric_difference) {
      symmetricDifferenceMenuItem.setChecked(true);
      showGeometry(GeometryEngine.symmetricDifference(inputPolygon1, inputPolygon2));