如何更改 ViewPager 的页面?

I'm using ViewPager in my app and define it in the main Activity. Inside onCreate method I load some number of pages from SharedPreferences and then pass it to PagerAdapter:

@Override
public int getCount() {
    return numberOfPages;
}

问题是，如果我将 Preferences(或另一个 Activity)中的这个数字更改为我之前查看过的其他页面索引，我的应用程序会崩溃，因为当我使用这个 ViewPager 返回到 Activity 时，这个索引超出了范围.只需更改活动 ViewPager 的页面即可解决此问题.有什么办法吗?

The problem is that if I would change this number in Preferences (or another Activity) to some other less then page index I viewed before, my app crashes because this index is out of bounds when I return to the activity with this ViewPager. It can be fixed simply by changing active ViewPager's page. Is there any way to do it?

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