加载更多和刷新加载问题总结

对于加载更多问题可以有很多种，目前我们前面的平台采用的是以下方式加载更多，话不多说，直接附上代码……

public class CompanyView {

private ArrayList<Shop> shops, addShops;
    private DataParser parser;
    private ListView companyList;
    private ShopListAdapter adapter;
    private Context ctx;
    private int page = 1;// 页码
    private View moreView;// 加载更多
    private TextView moreText;
    private int visibleLastIndex;// 可见的最后一项
    private int visibleCount;// 可见的数目

    public void setContent(Context ctx, View lay) {
        this.ctx = ctx;
        companyList = (ListView) lay.findViewById(R.id.category_shop_list);
        if (CheckNet.netIsAvaliable(ctx)) {
            new AsynLoad(ctx).execute(Config.CATEGORYACTIVITY_MSG);
        }
        companyList.setOnItemClickListener(itemListener);
        moreView = ((CategoryActivity) ctx).getLayoutInflater().inflate(
                R.layout.add_more_layout, null);
        companyList.addFooterView(moreView);
        moreText = (TextView) moreView.findViewById(R.id.add_more_text);
        moreView.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {
                // TODO Auto-generated method stub
                page++;
                addMore();
            }
        });
        companyList.setOnScrollListener(listScrollListener);
    }

    // 从网络上获取数据
    public void initData() {
        parser = new DataParser();
        shops = parser.parserShops(Constant.replacePage(1));
    }

    // 为Listview装载数据
    public void setData() {
        if (shops != null) {
            adapter = new ShopListAdapter(ctx, shops);
            companyList.setAdapter(adapter);
        }
    }

    private AdapterView.OnItemClickListener itemListener = new OnItemClickListener() {

        public void onItemClick(AdapterView<?> parent, View view, int position,
                long id) {
            // TODO Auto-generated method stub
            Intent i = new Intent(ctx, ShopActivity.class);
            Bundle data = new Bundle();
            data.putSerializable("shop", shops.get(position));
            i.putExtras(data);
            ctx.startActivity(i);
        }
    };

    // 加载更多
    private void addMore() {
        moreText.setText("加载中......");
        new Handler().postDelayed(new Runnable() {

            public void run() {
                // TODO Auto-generated method stub
                boolean flag = loadMore();
                adapter.notifyDataSetChanged();
                companyList.setSelection(visibleLastIndex - visibleCount + 1);
                if (flag) {
                    moreText.setText("更多");
                } else {
                    moreText.setText("加载完毕了");
                }
            }
        }, 2000);
    }

    // 加载数据
    private boolean loadMore() {
        String url;
        parser = new DataParser();
        url = Constant.replacePage(page);// 页码替换
        Log.i("more", url);
        addShops = parser.parserShops(url);
        Log.i("page===============>", "" + page);
        if (addShops == null || addShops.size() == 0) {
            return false;
        } else {
            for (Shop shop : addShops) {
                adapter.addShop(shop);
            }
            return true;
        }
    }

    private OnScrollListener listScrollListener = new OnScrollListener() {
        public void onScrollStateChanged(AbsListView view, int scrollState) {
        }

        public void onScroll(AbsListView view, int firstVisibleItem,
                int visibleItemCount, int totalItemCount) {
            // TODO Auto-generated method stub
            visibleCount = visibleItemCount;
            visibleLastIndex = visibleItemCount + firstVisibleItem - 1;
        }
    };

}