code: public void writeToParcel(Parcel out, int flags) {
          out.writeFloat(left);
          out.writeFloat(top);
          out.writeFloat(right);
          out.writeFloat(bottom);
      }
docs: Write this viewport to the specified parcel. To restore a viewport from a parcel, use readFromParcel()
  
  @param out The parcel to write the viewport's coordinates into