[Demonstration 1]

[Buggy Method]
@Override
public void onScrollStateChanged(int scrollState) {
    if (scrollState == IScrollDetector.SCROLL_STATE_IDLE) {
        View itemView = ItemChecker.getNextTrackerView(mListView, mViewTracker);
        Log.e(TAG, "onScrollStateChanged: itemView -> " + itemView + " edge -> " + mViewTracker.getEdgeString());
        if (itemView != null) {
            mViewTracker.trackView(itemView).into(this);
            mViewTracker.getVideoLayerView().setVisibility(View.VISIBLE);
        }
    }
}

[Buggy Hunk]
if (scrollState == IScrollDetector.SCROLL_STATE_IDLE) {

[Patch]
if (scrollState == IScrollDetector.SCROLL_STATE_IDLE && mViewTracker.getContext() != null) {

[Demonstration 2]

[Buggy Method]
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_book_list, container, false);
    HomerPlayerApplication.getComponent(view.getContext()).inject(this);
    bookAdapter = new BookListPagerAdapter(getFragmentManager(), audioBookManager);
    bookPager = (ViewPager) view.findViewById(R.id.bookListPager);
    bookPager.setAdapter(bookAdapter);
    bookPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {

        int currentViewIndex;

        @Override
        public void onPageSelected(int i) {
            FragmentBookItem itemFragment = (FragmentBookItem) bookAdapter.getItem(i);
            audioBookManager.setCurrentBook(itemFragment.getAudioBookId());
            currentViewIndex = i;
        }

        @Override
        public void onPageScrollStateChanged(int state) {
            if (state == ViewPager.SCROLL_STATE_IDLE) {
                int adjustedIndex = bookAdapter.wrapViewIndex(currentViewIndex);
                if (adjustedIndex != currentViewIndex)
                    bookPager.setCurrentItem(adjustedIndex, false);
            }
        }
    });
    updateViewPosition();
    EventBus.getDefault().register(this);
    return view;
}

[Buggy Hunk]
bookAdapter = new BookListPagerAdapter(getFragmentManager(), audioBookManager);

[Patch]
bookAdapter = new BookListPagerAdapter(getChildFragmentManager(), audioBookManager);

[Demonstration 3]

[Buggy Method]
@SuppressLint("ResourceAsColor")
public void setBottomLabel(String lable) {
    if (tvErrorPhone != null) {
        tvErrorPhone.setText(lable);
        tvErrorPhone.setVisibility(VISIBLE);
        tvErrorPhone.setTextColor(android.R.color.darker_gray);
    }
}

[Buggy Hunk]
tvErrorPhone.setTextColor(android.R.color.darker_gray);

[Patch]
tvErrorPhone.setTextColor(R.color.mCodePhoneDarkerGray);