viewpager 中fragment的切换页面没刷新

一个viewpaper中切换，FragmentPagerAdapter中的fragment没有及时刷新，使用FragmentstatePagerAdapter仍然解决不了问题，最后参考源码修改：
package com.android.hairstylist.tab.liushui;

import android.os.Parcelable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.view.PagerAdapter;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;

public abstract class FragmentpaperViewAdapater extends PagerAdapter {

private static final String TAG = "FragmentPagerAdapter";
private static final boolean DEBUG = true;

private final FragmentManager mFragmentManager;

public FragmentpaperViewAdapater(FragmentManager fm) {
    mFragmentManager = fm;
}

/**
 * Return the Fragment associated with a specified position.
 */
public abstract Fragment getItem(int position);

@Override
public void startUpdate(ViewGroup container) {
}

@Override
public Object instantiateItem(ViewGroup container, int position) {
    Fragment fragment = getItem(position);
    if(!fragment.isAdded()){
        FragmentTransaction ft = mFragmentManager.beginTransaction();
        ft.add(fragment, fragment.getClass().getName());
        ft.commit();
        mFragmentManager.executePendingTransactions();
    }
    if(fragment.getView().getParent() == null){
        container.addView(fragment.getView()); // 为viewpager增加布局
    }

    return fragment.getView();
}

@Override
public void destroyItem(ViewGroup container, int position, Object object) {
    container.removeView((View) object);
}


@Override
public boolean isViewFromObject(View view, Object object) {
    return view == object;
}

@Override
public Parcelable saveState() {
    return null;
}

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

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

}