android-viewpager-adapter

class MyPageAdapter extends PagerAdapter implements BGARefreshLayout.BGARefreshLayoutDelegate {

        private List<String> list;

        public MyPageAdapter(List<String> list) {
            this.list = list;
        }

        @Override
        public int getCount() {
            return list.size();
        }

        @Override
        public boolean isViewFromObject(View view, Object object) {
            return view == object;
        }

        @Override
        public Object instantiateItem(ViewGroup container, int position) {

            List<FirstAndSecondLevelClassifyEntity.son> list = (List<FirstAndSecondLevelClassifyEntity.son>) getIntent().getSerializableExtra("classify_secondLevelList");
            secondCateId = list.get(position).getId();

            View view = LayoutInflater.from(context).inflate(R.layout.shopping_classify_fragment, null);
            view.setId(new Random().nextInt(1000));
            mrefreshLayout = (BGARefreshLayout) view.findViewById(R.id.m_refreshLayout);
            data_recycleview = (RecyclerView) view.findViewById(R.id.data_recycleview);
            mrefreshLayout.setDelegate(this);
            mrefreshLayout.setRefreshViewHolder(new BGANormalRefreshViewHolder(context, true));
            data_recycleview.setLayoutManager(new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL));

//            mrefreshLayout.beginRefreshing();
//            addGoodsData();
            shoppingClassifyGridAdapter = new ShoppingClassifyGridAdapter(context, goodlist);
            data_recycleview.setAdapter(shoppingClassifyGridAdapter);
            data_recycleview.setOnTouchListener(
                    new View.OnTouchListener() {
                        @Override
                        public boolean onTouch(View v, MotionEvent event) {
                            if (mrefreshLayout.isLoadingMore()) {
                                return true;
                            } else {
                                return false;
                            }
                        }
                    }
            );
            container.addView(view);
            return view;
        }

        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
//            super.destroyItem(container, position, object);
            container.removeView((View) object);
        }

        @Override
        public int getItemPosition(Object object) {
            return POSITION_NONE;
        }


        @Override
        public void onBGARefreshLayoutBeginRefreshing(final BGARefreshLayout refreshLayout) {

            page = 1;
            goodlist.clear();
            addGoodsData();

            refreshLayout.endRefreshing();

        }

        @Override
        public boolean onBGARefreshLayoutBeginLoadingMore(final BGARefreshLayout refreshLayout) {
            // 如果网络可用，则异步加载网络数据，并返回true，显示正在加载更多
            new AsyncTask<Void, Void, Void>() {

                @Override
                protected Void doInBackground(Void... params) {
//                try {
////                    Thread.sleep(250);
//                } catch (InterruptedException e) {
//                    e.printStackTrace();
//                }
                    return null;
                }

                @Override
                protected void onPostExecute(Void aVoid) {
                    // 加载完毕后在UI线程结束加载更多
                    page++;
                    if (page > 3) {
                        refreshLayout.endLoadingMore();
                        ToastUtils.show(context, "没有最新数据了");

                    } else {
                        ShoppingClassifyGridEntity entity = new ShoppingClassifyGridEntity();
                        entity.setGoods_name("时尚T恤时尚时尚最时尚灰常时髦");
                        entity.setGoods_sell("6");
                        entity.setGoods_price("87.00");
                        for (int i = 0; i < 2; i++) {
                            goodlist.add(entity);
                        }
                        shoppingClassifyGridAdapter.notifyDataSetChanged();
                        refreshLayout.endLoadingMore();
                    }
                }
            }.execute();
            return true;
        }

    }