android - RecyclerView 上方的隐藏 View

Question

我想在 recyclerview 上面做一些隐藏的过滤器选项(例如在旧版本的 spotify 中):

该怎么做？我在回收站上方使用 AppBar。

Answer 1

你可以使用这段代码做你想做的事

        mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
                    @Override
                    public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
                        super.onScrollStateChanged(recyclerView, newState);

                    }

                    @Override
                    public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
                        super.onScrolled(recyclerView, dx, dy);
                        if (dy > 0) {
                         //You should HIDE filter view here
                        } else if (dy < 0) {
                            System.out.println("Scrolled Upwards");
                            if (mLayoutManager.findFirstCompletelyVisibleItemPosition() == 0) {
                                //this is the top of the RecyclerView
                               System.out.println("==================================== >>>> Detect top of the item List");
                             //You should visible filter view here
                            } else {
                              //You should HIDE filter view here
                             }
                        } else {
                            System.out.println("No Vertical Scrolled");
                            //You should HIDE filter view here
                        }
                    }
                });