Android：滚动ListView时隐藏视图

Question

以下是交易人员，我有一个包含2个片段的活动（我们称之为FragmentA和FragmentB）。 FragmentA布局包含ListView，FragmentB布局的LinearLayout包含3 ImageButtons。

我想要做的是在滚动FragmentA＆＃39; LinearLayout时隐藏/制作隐藏的FragmentB ListView。

这是我的ListFragment代码

@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        super.onCreateView(inflater, container, savedInstanceState);

        View body = inflater.inflate(R.layout.list_frag, container, false);

        View button = inflater.inflate(R.layout.button_frag,container,false);

        linear = (LinearLayout) button.findViewById(R.id.buttons)

        myStuff = (ListView) body.findViewById(android.R.id.list);

        myStuff.setOnScrollListener(new AbsListView.OnScrollListener() {

            @Override
            public void onScroll(AbsListView v, int firstVisibleItem,
                                 int visibleItemCount, int totalItemCount) {

            }

            @Override
            public void onScrollStateChanged(AbsListView v, int scrollState) {

                switch(scrollState) {
                    case 2: // SCROLL_STATE_FLING
                        //hide button here
                        linear.setVisibility(View.GONE);
                        break;

                    case 1: // SCROLL_STATE_TOUCH_SCROLL
                        //hide button here
                        linear.setVisibility(View.GONE);
                        break;

                    case 0: // SCROLL_STATE_IDLE
                        //show button here
                        linear.setVisibility(View.VISIBLE);
                        break;

                    default:
                        //show button here
                        linear.setVisibility(View.VISIBLE);
                        break;
                }
            }
        });

上面的代码不起作用，因为我对Fragments相当新，所以我遇到了障碍。你们知道我做错了什么吗？