android - 在view_pager中交换回来后， fragment 未还原edittext值

交换viewPager中的3个片段后，第一个片段未恢复编辑框值...我在viewpager中具有3个片段，并单击第3个片段选项卡并交换回第1个片段..编辑文本填充空白..plz提供一些解决方案..代码在这儿..

public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View v = inflater.inflate(R.layout.fragment_item_master, container, false);
    viewPager = (ViewPager)v. findViewById(R.id.viewpager);
    setupViewPager(viewPager);
    tabLayout = (TabLayout)v. findViewById(R.id.tabs);
    tabLayout.setupWithViewPager(viewPager);
    return  v;
}

private void setupViewPager(ViewPager viewPager) {
   // ViewPagerAdapter adapter = new ViewPagerAdapter(mActivity.getSupportFragmentManager());
    ViewPagerAdapter adapter = new ViewPagerAdapter(getChildFragmentManager());
    adapter.addFragment(new ItemInfoFragment(), "Item Info");
    adapter.addFragment(new ItemExtraInfoFragment(), "Extra Info");
    adapter.addFragment(new OrderHistoryFragment(), "Order History");
    viewPager.setAdapter(adapter);
}



    class ViewPagerAdapter extends FragmentStatePagerAdapter {
            private final List<Fragment> mFragmentList = new ArrayList<>();
            private final List<String> mFragmentTitleList = new ArrayList<>();

            public ViewPagerAdapter(FragmentManager manager) {
                super(manager);
            }

            @Override
            public Fragment getItem(int position) {
                return mFragmentList.get(position);
            }

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

            public void addFragment(Fragment fragment, String title) {
                mFragmentList.add(fragment);
                mFragmentTitleList.add(title);
            }

最佳答案

仅当片段数量较少时才建议这样做。您可以使用yourViewPager.setOffscreenPageLimit(numberOfFragmentsInViewPager);这样做是因为每次刷卡都不会创建新的片段，因此数据得以保留。如果您不设置此属性，则默认值为1。