QRCodeReaderView - Android：如何在片段中实现？

Question

我将QRCodeReaderView的使用从Activity转换为Fragments，我遇到了问题。我将活动移动到swipeview正在调用的以下片段。 这是代码：

public class MainBusinessFragment extends Fragment implements QRCodeReaderView.OnQRCodeReadListener {
RoyalPoints points = new RoyalPoints();
private QRCodeReaderView mydecoderview;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    final View myView = inflater.inflate(
            R.layout.fragment_main_business, container, false);
    mydecoderview = (QRCodeReaderView) myView.findViewById(R.id.qrdecoderview);
    mydecoderview.setOnQRCodeReadListener(this);
    return myView;
}

// Called when a QR is decoded
// "text" : the text encoded in QR
// "points" : points where QR control points are placed
@Override
public void onQRCodeRead(String text, PointF[] points) {
    final String user = text;
    ImageView clicker = (ImageView) getActivity().findViewById(R.id.clicker);
    clicker.setVisibility(View.VISIBLE);
    clicker.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            addPoints(user);

                    }
                });

                }

                private void addPoints(String user) {
                    points.setPoints(10);
                    points.setUser(user);
                    points.setBusiness(ParseUser.getCurrentUser());
                    points.saveInBackground(new SaveCallback() {
                        @Override
                        public void done(ParseException e) {
                            Toast.makeText(getActivity(), "10 Points added", Toast.LENGTH_SHORT).show();
                        }
                    });

                }

我遇到以下错误，无法继续前进（“java.lang.ClassCastException：com.ilias.royal.MainBusinessFragment无法转换为android.app.Activity”）。 非常感谢任何帮助，谢谢。