viewpager中的三个片段

Question

我遇到了这个问题，如下图所示：

1）http://imageshack.us/photo/my-images/19/schermata20120512a09444.png/ 2）http://imageshack.us/photo/my-images/651/schermata20120512a09444.png/

我做了一个带有三个片段的viewpager，但滚动时，我看到其中一个，我会看到两个片段。

我的cose是：

公共类FragmentProjetSwipePageActivity扩展了FragmentActivity {

// derived from http://thepseudocoder.wordpress.com/2011/10/05/android-page-swiping-using-viewpager/


// list contains fragments to instantiate in the viewpager
List<Fragment> fragmentsV1 = new Vector<Fragment>();

// page adapter between fragment list and view pager
private PagerAdapter mPagerAdapter;
// view pager
private ViewPager mPager;


// activity data
public String p2text,p3text;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);


    // creating fragments and adding to list
    fragmentsV1.add(Fragment.instantiate(this,Page1Fragment.class.getName()));
            fragmentsV1.add(Fragment.instantiate(this,Page2Fragment.class.getName()));
    fragmentsV1.add(Fragment.instantiate(this,Page3Fragment.class.getName()));



    // creating adapter and linking to view pager
    mPager = (ViewPager) super.findViewById(R.id.pager1);
    this.mPagerAdapter = new PagerAdapter(super.getSupportFragmentManager(),fragmentsV1,this );
    mPager.setAdapter(this.mPagerAdapter);


    //Set a listener that will be invoked whenever the page changes or is incrementally scrolled.

}     }

PagerAdapter.java

public class PagerAdapter扩展了FragmentPagerAdapter {

// fragments to instantiate in the viewpager
private List<Fragment> fragments;
FragmentManager fm;
private static int NUM_PAGER_VIEWS = 2;

Context contex;

// constructor
public PagerAdapter(FragmentManager _fm,List<Fragment> fragments) {
    super(_fm);
    this.fragments = fragments;
    fm=_fm;

}

// return access to fragment from position, required override
@Override
public Fragment getItem(int position) {


    return this.fragments.get(position);
}

// number of fragments in list, required override
@Override
public int getCount() {

    return NUM_PAGER_VIEWS;
    //return this.fragments.size();

} 

}

感谢