ViewPager的更新数据

 今天最近写项目的时候用到了ViewPager,设置了PagerAdapter，可在刷新界面的时候没有效果，即使调用了apdatper的notifyDataSetChanged()

我的pagerAdapter实现是

<span style="font-size:18px;">public class BrowserPageAdapter extends PagerAdapter{


	private final int PAGE_COUNT = 8;
	private Context context;
	
	private ArrayList<View> listViews = new ArrayList<View>();
	
	
	public BrowserPageAdapter(Context context) {
		this.context = context;
		initViews();
	}
	
	public void initViews()
	{
		for (int i = 0; i < PAGE_COUNT; i++) {
		
			View view = View.inflate(context, R.layout.cartoon_pager_sub_view, null);
			listViews.add(view);
		}
	}
	
	@Override
	public int getCount() {
		return listViews.size();
	}


	@Override
	public boolean isViewFromObject(View arg0, Object arg1) {
		return arg0 == arg1;
	}
	
	@Override
	public Object instantiateItem(ViewGroup container, int position) {
		View view = listViews.get(position);
		ListView listView = (ListView) view.findViewById(R.id.list_view);
		BrowserListAdapter listAdapter = new BrowserListAdapter(context);
		listView.setAdapter(listAdapter );
		container.addView(view);
		return view;
	}
	
	
	@Override
	public void destroyItem(ViewGroup container, int position, Object object) {
		System.out.println("________destroyItem_________");
		container.removeView(listViews.get(position));
	}
	
}</span>

后来在网上找了方法，说要想实现刷新需要在自己定义的PagerAdapter中实现

1.  @Override  
2.        public int getItemPosition(Object object) {  
3.         return POSITION_NONE;  
4.        }  

注意：POSITION_NONE 是一个PagerAdapter的内部常量，值是-2，

API里面有说明:

int android.support.v4.view.PagerAdapter.POSITION_NONE = -2 [0xfffffffe]

然后刷新时调用PagerAdpter的 notifyDataSetChanged()就可以刷新PagerViewd的界面了