public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
    // ...
    mSavedState.set(position, fragment.isAdded()
            ? mFragmentManager.saveFragmentInstanceState(fragment) : null)
    // ...
}

@Override
public void onSaveInstanceState(@NonNull Bundle outState) {
    // 這里可以根據(jù)需要保存數(shù)據(jù)
    outState.putString(TAG, DATA_STR);
    super.onSaveInstanceState(outState);
}

public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    mContext = getActivity();
    View view = inflater.inflate(R.layout.demo_fragment_layout, null, false);
    initView(view);
    // savedInstanceState不為空的時(shí)候，可以從內(nèi)存中取出數(shù)據(jù)
    if (savedInstanceState != null) {
        mContentTv.setText(((String) savedInstanceState.get(TAG)) + ", 從內(nèi)存中取得數(shù)據(jù)");
        mContentTv.setTextColor(mContext.getResources().getColor(R.color.black));
    } else {
       loadNetData();
    }
    return view;
}

@Override
public void onComplete() {
    Log.d(TAG, "onComplete... ");
    mMyFragmentAdapter.clearSavedState();
    // 當(dāng)下拉刷新后，分別將當(dāng)前頁面進(jìn)行刷新、左右頁面在頁面選擇后再進(jìn)行刷新
    // 刷新當(dāng)前頁面
    int currentPosition = mViewPager.getCurrentItem();
    refreshUI(currentPosition);
    // 記錄左邊位置，待mViewPage切換的時(shí)機(jī)進(jìn)行刷新
    mLeftRefresh = currentPosition - 1 >= 0 ? currentPosition - 1 : -1;
    // 記錄右邊位置，待mViewPage切換的時(shí)機(jī)進(jìn)行刷新
    mRightRefresh = currentPosition + 1 <= mTabItemList.size() ? currentPosition + 1 : -1;
}
// 刷新當(dāng)前頁面
private void refreshUI(int position) {
    Fragment currentFragment = mMyFragmentAdapter.getCurrentFragment(position);
    if (currentFragment instanceof DemoFragment) {
        ((DemoFragment) currentFragment).loadNetData();
    }
}

public class MyFragmentAdapter extends FragmentStatePagerAdapter {
    private static final String TAG = "MyFragmentAdapter";
    public static final String POSITION = "POSITION";
    private List<TabItem> mTabItemList = new ArrayList<>();
    public MyFragmentAdapter(FragmentManager fm) {
        super(fm);
    }
    public void setTabItemList(List<TabItem> tabItemList) {
        mTabItemList = tabItemList;
    }
    @NonNull
    @Override
    public Fragment getItem(int position) {
        Bundle bundle = new Bundle();
        bundle.putInt(POSITION, position);
        Fragment demoFragment = new DemoFragment();
        demoFragment.setArguments(bundle);
        return demoFragment;
    }
    @Override
    public int getCount() {
        return mTabItemList.size();
    }
    @Nullable
    @Override
    public CharSequence getPageTitle(int position) {
        return mTabItemList.get(position).getName();
    }
    public void clearSavedState() {
        try {
            Class clazz = getClass().getSuperclass();
            Field savedStateField = clazz.getDeclaredField("mSavedState");
            savedStateField.setAccessible(true);
            Object object = savedStateField.get(this);
            ArrayList<Fragment.SavedState> savedStates = (ArrayList<Fragment.SavedState>) object;
            savedStates.clear();
        } catch (Exception e) {
            Log.e(TAG, "clear saved state is error");
        }
    }
   // 獲取當(dāng)前的Fragment
    @Nullable
    public Fragment getCurrentFragment(int position) {
        try {
            Class clazz = getClass().getSuperclass();
            Field mFragmentsField = clazz.getDeclaredField("mFragments");
            mFragmentsField.setAccessible(true);
            Object object = mFragmentsField.get(this);
            ArrayList<Fragment> fragmentArrayList = (ArrayList<Fragment>) object;
            return fragmentArrayList.get(position);
        } catch (Exception e) {
            Log.e(TAG, "getCurrentFragment is error");
            return null;
        }
    }
}

// 記錄左邊位置，待mViewPage切換的時(shí)機(jī)進(jìn)行刷新
mLeftRefresh = currentPosition - 1 >= 0 ? currentPosition - 1 : -1;

mViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
    }
    @Override
    public void onPageSelected(int position) {
        if (position == mLeftRefresh) {
            refreshUI(position);
            mLeftRefresh = -1;
        } else if (position == mRightRefresh) {
            refreshUI(position);
            mRightRefresh = -1;
        }
    }
    @Override
    public void onPageScrollStateChanged(int state) {
    }
});

private ArrayList<Fragment.SavedState> mSavedState = new ArrayList<>();

// 下拉刷新的回調(diào)
@Override
public void onComplete() {
    Log.d(TAG, "onComplete... ");
    // 清除內(nèi)存數(shù)據(jù)
    mMyFragmentAdapter.clearSavedState();
}
// MyFragmentAdapter
public void clearSavedState() {
    try {
        Class clazz = getClass().getSuperclass();
        Field savedStateField = clazz.getDeclaredField("mSavedState");
        savedStateField.setAccessible(true);
        Object object = savedStateField.get(this);
        ArrayList<Fragment.SavedState> savedStates = (ArrayList<Fragment.SavedState>) object;
        savedStates.clear();
    } catch (Exception e) {
        Log.e(TAG, "clear saved state is error");
    }
}