Android ListView实现无限循环滚动

转载请注明：http://blog.csdn.net/laibaigan/article/details/8863627

因项目需要循环展示列表数据，所以就实现了这个无限循环滚动的 LIstView.先说一下原理，原理呢，其实很简单，首先将要展示的数据循环展示三遍


监听ListView的滚动事件，当ListView滚动到第一遍第第二个时，ListView变自动跳到第二遍的第二个，同理，如果ListView滚动到倒数第一个时，ListView自动跳转到第二遍的倒数第一个，然后可以不停的向上或者向下滑动，永远不会到头，废话少说，上代码：

让ListView循环三遍展示

首先利用取余的方法，将List里面的数据循环展示

public class ListAdapter extends BaseAdapter {

private List<String> list;
private LayoutInflater mInflater;

public ListAdapter(Context context, List<String> list){
this.list = list;
this.mInflater = LayoutInflater.from(context);
}
/**
* 将数据循环展示三遍
*/
@Override
public int getCount() {
if(list != null){
return list.size() * 3;
}
return 0;
}

@Override
public Object getItem(int arg0) {

return list.get(arg0 % list.size());
}

@Override
public long getItemId(int arg0) {
return arg0 % list.size();
}
@Override
public View getView(int postition, View convertView, ViewGroup arg2) {
ViewHoler viewHolder = null;
if(convertView == null){
viewHolder = new ViewHoler();
convertView = mInflater.inflate(R.layout.adapter_list_layout, null);
viewHolder.tvText = (TextView) convertView.findViewById(R.id.adapter_list_layout_tv);
convertView.setTag(viewHolder);
}else{
viewHolder = (ViewHoler) convertView.getTag();
}
viewHolder.tvText.setText(list.get(postition % list.size()));//取余展示数据
return convertView;
}

static class ViewHoler{
TextView tvText;
}

}

然后实现监听ListView的滚动事件

public class MainActivity extends Activity implements OnScrollListener {

private ListView listView;
private List<String> list;
private ListAdapter adapter;
//	private LinearLayout linear;
//
//	private int stopPosition;
//	private int firstViewHeight;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = (ListView) findViewById(R.id.listView1);
list = getList();
adapter = new ListAdapter(this, list);
listView.setAdapter(adapter);
listView.setOnScrollListener(this);
listView.setSelection(list.size());
}

/**
* 获取数据
* @return
*/
public List<String> getList(){
List<String> list =  new ArrayList<String>();
for (int i = 0; i < 10; i++) {
list.add(String.valueOf(i));
}
return list;
}

@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {

}

/**
* 设置滚动监听，当滚动到第二个时，跳到地list.size()+2个，滚动到倒数第二个时，跳到中间第二个，setSelection时，
* 由于listView滚动并未停止，所以setSelection后会继续滚动，不会出现突然停止的现象
*/
@Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {

/**到顶部添加数据关键代码*/
if (firstVisibleItem <= 2) {
listView.setSelection(list.size() + 2);
} else if (firstVisibleItem + visibleItemCount > adapter.getCount() - 2) {//到底部添加数据
listView.setSelection(firstVisibleItem - list.size());
}

}

}

就是这么简单，嘿嘿，表达能力有点欠缺，不知到你看懂没，没看懂的话，后面附上源码：
http://download.csdn.net/detail/laibaigan/5312039

转载请注明：http://blog.csdn.net/laibaigan/article/details/8863627