Android给Viewpager默认指定页

private void setViewPaperItem(int position) {
        try {
            Class c = Class.forName("android.support.v4.view.ViewPager");
            Field field = c.getDeclaredField("mCurItem");
            field.setAccessible(true);
            field.seTint(viewPagerMain,position);
        } catch (Exception E) {
            e.printStackTrace();
        }
        adapter.notifyDataSetChanged();
        viewPagerMain.setCurrentItem(position);
    }