ViewPager，实现真正的无限循环（定时+手动）

int count = adapter.getCount();  
if (count > 1) { // 多于1个，才循环  
    int index = viewPager.getCurrentItem();  
    index = (index + 1) % count;  
    viewPager.setCurrentItem(index, true);  
}  

public class MyAdapter extends PagerAdapter{    
    @Override    
    public int getCount() {    
        return Integer.MAX_VALUE;    
    }    
  
    @Override    
    public boolean isViewFromObject(View arg0, Object arg1) {    
        return arg0 == arg1;    
    }    
  
    @Override    
    public void destroyItem(View container, int position, Object object) {    
        ((ViewPager)container).removeView(mImageViews[position % count]);    
            
    }    
    public Object instantiateItem(View container, int position) {    
            View view = mImageViews[position % count];  
        ((ViewPager)container).addView(view, 0);    
        return view;    
    }    
}    
  
protected void onCreate(Bundle savedInstanceState) {   
    viewPager.setAdapter(new MyAdapter());    
    //设置ViewPager的默认项, 设置为总数的100倍，一开始才能往左滑动    
    viewPager.setCurrentItem(count * 100);              
}    

public class AdapterCycle extends PagerAdapter   
        implements ViewPager.OnPageChangeListener{  
    private Context mContext; // 上下文  
    private LayoutInflater mInflater; // 用于解XML  
    private LinkedList<View> mViews; // <span style="font-family: Arial, Helvetica, sans-serif;">用于</span><span style="font-family: Arial, Helvetica, sans-serif;">显示的View</span>  
    private List<Drawable> mList; // 数据源<span style="font-family: Arial, Helvetica, sans-serif;">Drawable</span>  
    private ViewPager mViewPager; //页面  
      
      
    public AdapterCycle(Context context, ViewPager viewPager,   
        List<Drawable> list)  
    {  
        mContext = context;  
        mInflater = LayoutInflater.from(context);  
        mViewPager = viewPager;  
        if (list != null) {  
            //无论是否多于1个，都要初始化第一个（index:0）  
            mViews = new LinkedList<View>();  
            ImageView view = (ImageView) mInflater.inflate(  
                    R.layout.activity_main_item_cycle, null);  
            Drawable drawable = list.get(list.size() - 1);  
            view.setImageDrawable(drawable);  
            mViews.add(view);  
            //注意，如果不只1个，mViews比mList多两个（头尾各多一个）  
            //假设：mList为mList[0~N-1], mViews为mViews[0~N+1]  
            // mViews[0]放mList[N-1], mViews[i]放mList[i-1], mViews[N+1]放mList[0]  
            // mViews[1~N]用于循环；首位之前的mViews[0]和末尾之后的mViews[N+1]用于跳转  
            // 首位之前的mViews[0]，跳转到末尾（N）；末位之后的mViews[N+1]，跳转到首位（1）  
            if( list.size() > 1) { //多于1个要循环  
                for (Drawable d : list) { //中间的N个（index:1~N）  
                    ImageView v = (ImageView) mInflater.inflate(  
                            R.layout.activity_main_item_cycle, null);  
                    v.setImageDrawable(d);  
                    mViews.add(v);  
                }  
                //最后一个（index:N+1）  
                view = (ImageView) mInflater.inflate(  
                        R.layout.activity_main_item_cycle, null);  
                drawable = dList.get(0);  
                view.setImageDrawable(drawable);  
                mViews.add(view);  
            }  
        }  
    }  
      
    @Override  
    public int getCount() {  
        return mViews.size();  
    }  
      
    @Override  
    public boolean isViewFromObject(View view, Object object) {  
        return view == object;  
    }  
  
    @Override  
    public void destroyItem(ViewGroup container, int position, Object object) {  
        ((ViewPager) container).removeView(mViews.get(position));  
    }  
  
    @Override  
    public Object instantiateItem(ViewGroup container, int position) {  
        View view = mViews.get(position);  
        container.addView(view);  
        return view;  
    }  
      
      
    // 实现ViewPager.OnPageChangeListener接口  
    @Override  
    public void onPageSelected(int position) {  
        LogUtils.logi(TAG, "onPageSelected:" + position);  
        if ( mViews.size() > 1) { //多于1，才会循环跳转  
            if ( position < 1) { //首位之前，跳转到末尾（N）  
                position = mList.size(); //注意这里是mList，而不是mViews  
                mViewPager.setCurrentItem(position, false);  
            } else if ( position > mList.size()) { //末位之后，跳转到首位（1）  
                mViewPager.setCurrentItem(1, false); //false:不显示跳转过程的动画  
                position = 1;  
            }  
        }         
    }  
  
    @Override  
    public void onPageScrolled(int position, float positionOffset,  
            int positionOffsetPixels) {  
        // 什么都不干  
    }  
  
    @Override  
    public void onPageScrollStateChanged(int state) {  
        // 什么都不干  
    }  
}  
  
  
    //在外层，将mViewPager初始位置设置为1即可  
    if (mAdapterCycle.getCount() > 1) { //多于1个，才循环并开启定时器  
        mViewPager.setCurrentItem(1); //将mViewPager初始位置设置为1  
        startTimer(); //开启定时器，定时切换页面  
    }  

int count = adapter.getCount();  
if (count > 2) { // 实际上，多于1个，就多于3个  
    int index = viewPager.getCurrentItem();  
    index = index % (count - 2) + 1; //这里修改过  
    viewPager.setCurrentItem(index, true);  
}