Android Viewpager.setCurrentitem () and FragmentPagerAdapter fragments instantiateItem () initialize mismatch

I have a problem with FragmentPagerAdapter

, I set fragments in the viewpager via FragmentPagerAdapter

, I have to dynamically show the viewpager, I have the listview data that I need to show in the viewpager, when I click on the list I have to load the exact position in the viewpager so I just set the total size element to display in the FragmentPagerAdapter, but the problem is when I select the position of the viewpager through mPager.setCurrentItem(listposition)

, it shows the correct position of the viewpager, but loading the data in the wrong place, it loads into the next fragment at the position of the viewpager.after some tracking in the FragmentPagerAdapter, I show that the instantiateItem method initializes one fragment in advance, for example I set the currentitem (from the list) of the viewpager 2 then the instantiateItem method initializes 0 to 3 fragments, I think the reason the data is loading in the 3rd fragment , I tried a lot with FragmentStatePagerAdapter but had no success , please help me, thanks in advance.

Mainactivity (Fragmnetactivity) class:

 public class NewsDetail extends FragmentActivity implements OnClickListener {
    public static ViewPager mPager;
    private static int NUM_PAGES;
    private PagerAdapter mPagerAdapter;
    public static ArrayList<Integer> exist_detail = new ArrayList<Integer>();
    public static ArrayList<PageFragment> detailfragment = new ArrayList<PageFragment>();


    mPager = (ViewPager) findViewById(R.id.pager);
    mPagerAdapter = new ScreenSlidePagerAdapter(getSupportFragmentManager());
    mPager.setAdapter(mPagerAdapter);

    NUM_PAGES = topList.size();
    PageFragment fragment = new PageFragment();
    Bundle args = new Bundle();
    args.putInt("page", i);
    fragment.setArguments(args);
    detailfragment.add(fragment);

    mPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {

        @Override
        public void onPageSelected(int arg0) {
                if (PageFragment.getInstance() != null) {
                    Log.d("LOG","PageFragment || "+ PageFragment.getInstance());
                    PageFragment.getInstance().startLoadingNews(
                            MusicList.topMusicList.get(arg0)._id);
                }
            return;
        }

        @Override
        public void onPageScrolled(int arg0, float arg1, int arg2) {}

        @Override
        public void onPageScrollStateChanged(int arg0) {}
    });
    mPagerAdapter.notifyDataSetChanged();

    mPager.setCurrentItem(listposition);// setcurrent item from here , it is selected from list. "listposition" indicate list position click



    private class ScreenSlidePagerAdapter extends FragmentPagerAdapter {

            private FragmentManager mFragmentManager;
            private FragmentTransaction mCurTransaction = null;
            private Fragment mCurrentPrimaryItem = null;
            private static final boolean DEBUG = false;

            public ScreenSlidePagerAdapter(FragmentManager fragmentManager) {
                super(fragmentManager);
                this.mFragmentManager = fragmentManager;
            }

            @Override
            public Fragment getItem(int position) {

                return detailfragment.get(position);
            }

            @Override
            public long getItemId(int position) {
                // TODO Auto-generated method stub
                return super.getItemId(position);
            }

            @Override
            public Object instantiateItem(ViewGroup container, int position) {

                Log.v("LOG", "On InstantiateItem " + position);// it indicate that this method initialize one fragment in advance.

                return super.instantiateItem(container, position);
            }

            public String makeFragmentName(int viewId, long index) {
                return "android:switcher:" + viewId + ":" + index;
            }

            @Override
            public void destroyItem(ViewGroup container, int position, Object object) {
                if (mCurTransaction == null) {
                    mCurTransaction = mFragmentManager.beginTransaction();
                }
                if (DEBUG)
                    Log.e("LOG", "Detaching item #" + position + ": f=" + object
                            + " v=" + ((Fragment) object).getView());
                mCurTransaction.detach((Fragment) object);
            }

            @Override
            public void restoreState(Parcelable state, ClassLoader loader) {
            }

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

      

        
        
        
      

    

PageFragment

       public class PageFragment extends Fragment implements OnClickListener {

            @Override
            public void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                mPageNumber = getArguments().getInt(ARG_PAGE);
                mDetailPageFragment = this;
            }

            @Override
            public View onCreateView(LayoutInflater inflater, ViewGroup container,
                    Bundle savedInstanceState) {
                // Inflate the layout containing a title and body text.
                rootView = (ViewGroup) inflater.inflate(R.layout.newsdetail, container,
                        false);
                //init();
                return rootView;
            }
            public void startLoadingNews(String _id) {

                if (NetworkUtil.cheackNetwork(mActivity)) {
                    executeTask(_id);
                } else {
                    showRetryCancelDialog();
                }
             }
            }