android Listview分批加载+自动加载(附源码下载)
直接上代码,代码有注释:
public class TestForListviewActivity extends Activity implements OnScrollListener { private ListView mListview = null; private View mFooterView; private PaginationAdapter mAdapter; private Handler handler=new Handler(); private boolean isLoading;//表示是否正在加载 private final int MAX_COUNT=35;//表示服务器上总共有MAX_COUNT条数据 private final int EACH_COUNT=10;//表示每次加载的条数 @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mFooterView = getLayoutInflater().inflate(R.layout.loadmore, null); mListview = (ListView) findViewById(R.id.listview); mListview.addFooterView(mFooterView);// 设置列表底部视图 List<News> news=new ArrayList<News>(); mAdapter = new PaginationAdapter(news);; mListview.setAdapter(mAdapter); //设置setOnScrollListener会自动调用onscroll方法。 mListview.setOnScrollListener(this); } public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) { if (firstVisibleItem+visibleItemCount==totalItemCount&&!isLoading) { //isLoading = true 表示正在加载,加载完毕设置isLoading =false; isLoading = true; //如果服务端还有数据,则继续加载更多,否则隐藏底部的加载更多 if (totalItemCount<=MAX_COUNT) { //等待2秒之后才加载,模拟网络等待时间为2s handler.postDelayed(new Runnable() { public void run() { loadMoreData(); } },2000); }else{ if (mListview.getFooterViewsCount()!=0) { mListview.removeFooterView(mFooterView); } } } } public void onScrollStateChanged(AbsListView arg0, int arg1) { Log.i("onScrollStateChanged", arg1+""); } private void loadMoreData(){ int count = mAdapter.getCount(); for (int i = 0; i < EACH_COUNT; i++) { if (count+i<MAX_COUNT) { News item = new News(); item.setTitle("Title" + (count+i)); item.setContent("This is News Content" + (count+i)); mAdapter.addNewsItem(item); }else{ mListview.removeFooterView(mFooterView); } } mAdapter.notifyDataSetChanged(); isLoading = false; } class PaginationAdapter extends BaseAdapter { List<News> newsItems; public PaginationAdapter(List<News> newsitems) { this.newsItems = newsitems; } public int getCount() { return newsItems==null?0:newsItems.size(); } public Object getItem(int position) { return newsItems.get(position); } public long getItemId(int position) { return position; } public void addNewsItem(News newsitem) { newsItems.add(newsitem); } public View getView(int position, View convertView, ViewGroup parent) { if (convertView == null) { convertView = getLayoutInflater().inflate(R.layout.list_item, null); } // 新闻标题 TextView tvTitle = (TextView) convertView .findViewById(R.id.newstitle); tvTitle.setText(newsItems.get(position).getTitle()); // 新闻内容 TextView tvContent = (TextView) convertView .findViewById(R.id.newscontent); tvContent.setText(newsItems.get(position).getContent()); return convertView; } } }
demo源码下载:源码下载
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