implementing WizaredPager in a fragment : how to fix "Activity must implement PageFragmentCallbacks" ?

[SouilahTaha]

I'am trying to use wizaredPager in a fragment, and i got "Activity must implement PageFragmentCallbacks" exception . `

public class CollectionDonneesFragment extends Fragment implements PageFragmentCallbacks, ReviewFragment.Callbacks, ModelCallbacks

{
    private ViewPager mPager;
    private MyPagerAdapter mPagerAdapter;

    private boolean mEditingAfterReview;

    private AbstractWizardModel mWizardModel = new NotificationWizardModel(getContext());

    private boolean mConsumePageSelectedEvent;

    private Button mNextButton;
    private Button mPrevButton;

    private List<Page> mCurrentPageSequence;
    private StepPagerStrip mStepPagerStrip;

    @Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View view =inflater.inflate(R.layout.fragment_collection_donnees, container, false);
        if (savedInstanceState != null) {
            mWizardModel.load(savedInstanceState.getBundle("model"));
        }

        mWizardModel.registerListener(this);

        mPagerAdapter = new MyPagerAdapter(getFragmentManager());
        mPager = (ViewPager) view.findViewById(R.id.pager);
        mPager.setAdapter(mPagerAdapter);
        mStepPagerStrip = (StepPagerStrip) view.findViewById(R.id.strip);
        mStepPagerStrip
                .setOnPageSelectedListener(new StepPagerStrip.OnPageSelectedListener() {
                    @Override
                    public void onPageStripSelected(int position) {
                        position = Math.min(mPagerAdapter.getCount() - 1,
                                position);
                        if (mPager.getCurrentItem() != position) {
                            mPager.setCurrentItem(position);
                        }
                    }
                });

        mNextButton = (Button) view.findViewById(R.id.next_button);
        mPrevButton = (Button) view.findViewById(R.id.prev_button);

        mPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
            @Override
            public void onPageSelected(int position) {
                mStepPagerStrip.setCurrentPage(position);

                if (mConsumePageSelectedEvent) {
                    mConsumePageSelectedEvent = false;
                    return;
                }

                mEditingAfterReview = false;
                updateBottomBar();
            }
        });

        mNextButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (mPager.getCurrentItem() == mCurrentPageSequence.size()) {
                    DialogFragment dg = new DialogFragment() {
                        @Override
                        public Dialog onCreateDialog(Bundle savedInstanceState) {
                            return new AlertDialog.Builder(getActivity())
                                    .setMessage("Envoyer vos données ? Activez la reception des notification et suivez toutes les nouveautés de votre opérateur")
                                    .setPositiveButton(
                                            "Envoyer vos données",
                                            null)
                                    .setNegativeButton(android.R.string.cancel,
                                            null).create();
                        }
                    };
                    dg.show(getFragmentManager(), "place_order_dialog");
                } else {
                    if (mEditingAfterReview) {
                        mPager.setCurrentItem(mPagerAdapter.getCount() - 1);
                    } else {
                        mPager.setCurrentItem(mPager.getCurrentItem() + 1);
                    }
                }
            }
        });

        mPrevButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                mPager.setCurrentItem(mPager.getCurrentItem() - 1);
            }
        });

        onPageTreeChanged();
        updateBottomBar();
    return view;
}

    @Override
    public void onPageTreeChanged() {
        mCurrentPageSequence = mWizardModel.getCurrentPageSequence();
        recalculateCutOffPage();
        mStepPagerStrip.setPageCount(mCurrentPageSequence.size() + 1); // + 1 =
        // review
        // step
        mPagerAdapter.notifyDataSetChanged();
        updateBottomBar();
    }

    private void updateBottomBar() {
        int position = mPager.getCurrentItem();
        if (position == mCurrentPageSequence.size()) {
            mNextButton.setText("Finir");
            mNextButton.setBackgroundResource(R.drawable.finish_background);
            mNextButton.setTextAppearance(getContext(), R.style.TextAppearanceFinish);
        } else {
            mNextButton.setText(mEditingAfterReview ? R.string.review
                    : R.string.next);
            mNextButton
                    .setBackgroundResource(R.drawable.selectable_item_background);
            TypedValue v = new TypedValue();
            getActivity().getTheme().resolveAttribute(android.R.attr.textAppearanceMedium, v,
                    true);
            mNextButton.setTextAppearance(getContext(), v.resourceId);
            mNextButton.setEnabled(position != mPagerAdapter.getCutOffPage());
        }

        mPrevButton
                .setVisibility(position <= 0 ? View.INVISIBLE : View.VISIBLE);
    }

    @Override
    public AbstractWizardModel onGetModel() {
        return mWizardModel;
    }

    @Override
    public void onEditScreenAfterReview(String key) {
        for (int i = mCurrentPageSequence.size() - 1; i >= 0; i--) {
            if (mCurrentPageSequence.get(i).getKey().equals(key)) {
                mConsumePageSelectedEvent = true;
                mEditingAfterReview = true;
                mPager.setCurrentItem(i);
                updateBottomBar();
                break;
            }
        }
    }

    @Override
    public void onPageDataChanged(Page page) {
        if (page.isRequired()) {
            if (recalculateCutOffPage()) {
                mPagerAdapter.notifyDataSetChanged();
                updateBottomBar();
            }
        }
    }

    @Override
    public Page onGetPage(String key) {
        return mWizardModel.findByKey(key);
    }

    private boolean recalculateCutOffPage() {
        // Cut off the pager adapter at first required page that isn't completed
        int cutOffPage = mCurrentPageSequence.size() + 1;
        for (int i = 0; i < mCurrentPageSequence.size(); i++) {
            Page page = mCurrentPageSequence.get(i);
            if (page.isRequired() && !page.isCompleted()) {
                cutOffPage = i;
                break;
            }
        }

        if (mPagerAdapter.getCutOffPage() != cutOffPage) {
            mPagerAdapter.setCutOffPage(cutOffPage);
            return true;
        }

        return false;
    }

    public class MyPagerAdapter extends FragmentStatePagerAdapter {
        private int mCutOffPage;
        private Fragment mPrimaryItem;

        public MyPagerAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public Fragment getItem(int i) {
            if (i >= mCurrentPageSequence.size()) {
                return new ReviewFragment();
            }

            return mCurrentPageSequence.get(i).createFragment();
        }

        @Override
        public int getItemPosition(Object object) {
            // TODO: be smarter about this
            if (object == mPrimaryItem) {
                // Re-use the current fragment (its position never changes)
                return POSITION_UNCHANGED;
            }

            return POSITION_NONE;
        }

        @Override
        public void setPrimaryItem(ViewGroup container, int position,
                                   Object object) {
            super.setPrimaryItem(container, position, object);
            mPrimaryItem = (Fragment) object;
        }

        @Override
        public int getCount() {
            return Math.min(mCutOffPage + 1, mCurrentPageSequence == null ? 1
                    : mCurrentPageSequence.size() + 1);
        }

        public void setCutOffPage(int cutOffPage) {
            if (cutOffPage < 0) {
                cutOffPage = Integer.MAX_VALUE;
            }
            mCutOffPage = cutOffPage;
        }

        public int getCutOffPage() {
            return mCutOffPage;
        }
    }

} and this is the logcat E/AndroidRuntime: FATAL EXCEPTION: main java.lang.ClassCastException: Activity must implement PageFragmentCallbacks at com.tech.freak.wizardpager.ui.SingleChoiceFragment.onAttach(SingleChoiceFragment.java:106) at android.support.v4.app.Fragment.onAttach(Fragment.java:1196) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1036) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1281) at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:758) at android.support.v4.app.FragmentManagerImpl.execSingleAction(FragmentManager.java:1627) at android.support.v4.app.BackStackRecord.commitNowAllowingStateLoss(BackStackRecord.java:637) at android.support.v4.app.FragmentStatePagerAdapter.finishUpdate(FragmentStatePagerAdapter.java:166) at android.support.v4.view.ViewPager.populate(ViewPager.java:1235) at android.support.v4.view.ViewPager.populate(ViewPager.java:1083) at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1609) at android.view.View.measure(View.java:12865) at android.widget.LinearLayout.measureVertical(LinearLayout.java:822) at android.widget.LinearLayout.onMeasure(LinearLayout.java:563) at android.view.View.measure(View.java:12865) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4712) at android.widget.FrameLayout.onMeasure(FrameLayout.java:293) at android.view.View.measure(View.java:12865) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4712) at android.widget.FrameLayout.onMeasure(FrameLayout.java:293) at android.view.View.measure(View.java:12865) at android.support.v4.widget.DrawerLayout.onMeasure(DrawerLayout.java:1079) at android.view.View.measure(View.java:12865) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4712) at android.widget.FrameLayout.onMeasure(FrameLayout.java:293) at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:135) at android.view.View.measure(View.java:12865) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4712) at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1385) at android.widget.LinearLayout.measureVertical(LinearLayout.java:670) at android.widget.LinearLayout.onMeasure(LinearLayout.java:563) at android.view.View.measure(View.java:12865) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4712) at android.widget.FrameLayout.onMeasure(FrameLayout.java:293) at android.view.View.measure(View.java:12865) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4712) at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1385) at android.widget.LinearLayout.measureVertical(LinearLayout.java:670) at android.widget.LinearLayout.onMeasure(LinearLayout.java:563) at android.view.View.measure(View.java:12865) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4712) at android.widget.FrameLayout.onMeasure(FrameLayout.java:293) at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2242) at android.view.View.measure(View.java:12865) at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1240) at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2632) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:137) at android.app.ActivityThread.main(ActivityThread.java:4517) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:511) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:993) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:760) at dalvik.system.NativeStart.main(Native Method)`