Viewpager中的Fragment 滑动时保存状态的问题

package com.ynzlkj.selfproject.UserMode.adapter;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.view.ViewGroup;

import java.util.List;

/**
 * Created by 陈骏 on 2017/7/14 0014.
 * QQ：200622550
 * 作用：首页Tab适配
 */

public class TabFragmentPagerAdapter extends FragmentPagerAdapter {

    public FragmentManager fm;
    private List<Fragment> mFragments;
    private List<String> mTitles;

    public TabFragmentPagerAdapter(FragmentManager fragmentManager, List<Fragment> fragments) {
        super(fragmentManager);
        fm = fragmentManager;
        mFragments = fragments;
    }

    public TabFragmentPagerAdapter(FragmentManager fragmentManager, List<Fragment> fragments, List<String> titles) {
        super(fragmentManager);
        fm = fragmentManager;
        mFragments = fragments;
        mTitles = titles;
    }

//    @Override
//    public Fragment getItem(int position) {
//        return mFragments.get(position);
//    }
    @Override
    public Fragment getItem(int position) {
        Fragment fragment = null;
        fragment = mFragments.get(position);
        Bundle bundle = new Bundle();
        bundle.putString("id", "" + position);
        fragment.setArguments(bundle);
        return fragment;
    }

    @Override
    public int getCount() {
        return mFragments.size();
    }

    @Override
    public CharSequence getPageTitle(int position) {
        return mTitles != null ? mTitles.get(position) : "";
    }

    @Override
    public Fragment instantiateItem(ViewGroup container, int position) {
        Fragment fragment = (Fragment) super.instantiateItem(container,
                position);
        fm.beginTransaction().show(fragment).commit();
        return fragment;
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        // super.destroyItem(container, position, object);
        Fragment fragment = mFragments.get(position);
        fm.beginTransaction().hide(fragment).commit();
    }
}