@Parceled
public class A implements Parcelable {

    public static final Creator<A> CREATOR = Postman.getCreator(A.class);

    State mState;

    @Override
    public int describeContents() {
        return 0;
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        Postman.writeToParcel(this, dest);
    }

    @Parceled
    public static class State implements Parcelable {

        public static final Creator<State> CREATOR = Postman.getCreator(State.class);

        // Postman Fields

        @Override
        public int describeContents() {
            return 0;
        }

        @Override
        public void writeToParcel(Parcel dest, int flags) {
            Postman.writeToParcel(this, dest);
        }
    }
}

@Parceled
public class B extends A implements Parcelable {

    public static final Creator<B> CREATOR = Postman.getCreator(B.class);

    State mState

@Override
    public int describeContents() {
        return 0;
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        Postman.writeToParcel(this, dest);
    }

    @Parceled
    public static class State extends A.State implements Parcelable {

        public static final Creator<State> CREATOR = Postman.getCreator(State.class);

        // Postman Fields

        @Override
        public int describeContents() {
            return 0;
        }

        @Override
        public void writeToParcel(Parcel dest, int flags) {
            Postman.writeToParcel(this, dest);
        }
    }
}

public final class B$State$$Parceler implements Parceler<B.State> {

  @Override
  public void writeToParcel(B.State object, Parcel dest) {
    Bundle bundle = new Bundle();
    bundle.putInt("mSomeCustomField", object.mSomeCustomField);
    dest.writeBundle(bundle);
  }

  @Override
  public B.State readFromParcel(Parcel parcel) {
    B.State object = new B.State();
    Bundle bundle = parcel.readBundle();
    bundle.setClassLoader(B.State.class.getClassLoader());
    object.mCurrentManaCost = bundle.getInt("mCurrentManaCost");
    return object;
  }

  @Override
  public B.State[] newArray(int size) {
    return new B.State[size];
  }

}

public final class B$$Parceler implements Parceler<B> {

  @Override
  public void writeToParcel(B object, Parcel dest) {
    Bundle bundle = new Bundle();
    bundle.putParcelable("mState", object.mState);
    bundle.putParcelable("mState", object.mState);
    dest.writeBundle(bundle);
  }

  @Override
  public Commander readFromParcel(Parcel parcel) {
    B object = new B();
    Bundle bundle = parcel.readBundle();
    bundle.setClassLoader(B.class.getClassLoader());
    object.mState = bundle.getParcelable("mState");
    object.mState = bundle.getParcelable("mState");
    return object;
  }

  @Override
  public B[] newArray(int size) {
    return new B[size];
  }

}