实现Android Listview分批加载+自动加载。
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;
}
}
}
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本文Demo源码下载：
具体下载目录在 /2014年资料/5月/11日/Android Listview分批加载+自动加载（附源码下载）