public interface GalleryOpener {
        void iosOnImagePicked(InputStream stream);

}

  public void iosOnImagePicked(final InputStream stream) {
        // Gallery
        MyDelegatePicker delegate = new MyDelegatePicker() {
            @Override
            public void didFinishPickingMedia(UIImagePickerController picker, UIImagePickerControllerEditingInfo info) {
                UIImage selectedImage = info.getOriginalImage();
                try {
                    stream.read(selectedImage.toPNGData().getBytes());

                } catch (IOException e) {
                    e.printStackTrace();
                }
                picker.dismissViewController(false, null);
            }
            @Override
            public void didCancel(UIImagePickerController picker) {
                picker.dismissViewController(false, null);
            }
        };
       UIViewController controller = ((IOSApplication) Gdx.app).getUIViewController();
        MyImagePickerController imagePicker = new MyImagePickerController();
        controller.addChildViewController(imagePicker);
        controller.getView().addSubview(imagePicker.getView());
        imagePicker.getView().setBounds(controller.getView().getBounds());
        imagePicker.setSourceType(UIImagePickerControllerSourceType.PhotoLibrary);
        imagePicker.setDelegate(delegate);
        imagePicker.addStrongRef((ObjCObject) delegate);
    }


________________________________________________________
public class .... {
GalleryOpener gallery;



boxImage1.addListener(new ChangeListener() {
                @Override
                public void changed(ChangeEvent event, Actor actor) {
                    iosGallery(???);

                }
            });


public void iosGallery(final InputStream stream) {
        gallery.iosOnImagePicked(stream);

    }