FragmentStatePagerAdapter在当前选项卡之前添加选项卡而不刷新

Question

我知道在SO中有一些问题，但是没有人帮助我。

这是我的情况：

• 我有一个带有N个动力学标签的布局。
• 其中一个标签（称为“活动”）具有包含某些真假项目的列表视图。
• 更改某些项目的值会在当前标签页之前（称为“详细信息”）添加或删除标签页。

解释这种情况：

开始情况

标签（当前选中的是粗体）

首页-详细信息-客户-工厂-活动-简而言之

• 在“活动”标签中，我更改了此复选框的选中值，这是我要成为的新情况：

首页-客户-工厂-活动-其他

这就是我得到的：

我只有两个要点：

---

1：选择了 SOMETHINGELSE 标签页眉，并显示了 ACTIVITIES 内容

2：选择了 ACTIVITIES 标签页眉，并显示了 SOMETHINGELSE 内容

我想要添加的标题是删除并删除显示 ACTIVITIES 选项卡并显示 ACTIVITIES 内容的标题。

在这很长的介绍之后，这是我的代码：

FragmentStatePagerAdapter

private class PagerAdapter extends FragmentStatePagerAdapter {
    private int mNumOfTabs;
    private SparseArray<MyFragmentsInterface> activeFragments;
    private ArrayList<MyHeaderEnum> titles;

    MyFragmentsInterface getNewMeterFragmentIfAvailable(int position) {
        try {
            return activeFragments.get(position);
        } catch (Exception ex) {
            return null;
        }
    }

    PagerAdapter(FragmentManager fm, int NumOfTabs, ArrayList<MyHeaderEnum> titles) {
        super(fm);
        this.activeFragments = new SparseArray<>();
        this.mNumOfTabs = NumOfTabs;
        this.titles = titles;
    }


    @Override
    public int getItemPosition(@NonNull Object object) {
        //I played a lot with this part to manage the addiction-removal of tabs before current, but without succeed
        return super.getItemPosition(object);
    }

    void removetitle(int position) {
        if (position != -1 && position < titles.size()) {
            titles.remove(position);
            mNumOfTabs--;
            notifyDataSetChanged();
        }
    }

    void addTitle(int position, MyHeaderEnum title) {
        titles.add(position, title);
        mNumOfTabs++;
        notifyDataSetChanged();
    }

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

    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        if (openedIntervention.isInPlace()) {
            activeFragments.get(position).save(false);
        }
        activeFragments.remove(position);

        super.destroyItem(container, position, object);
    }

    @Override
    public Fragment getItem(int position) {
        MyHeaderEnum currentTitle = titles.get(position);

        Bundle bundle = new Bundle();
        bundle.putString(_intervention_id_key, interventionID);

        currentFragment = newFragment;

        //this is to retrieve the correct content for the header
        switch (currentTitle) {
            case DETTAGLIO:
                InterventoDettaglioFragment interventoDettaglioFragment = new InterventoDettaglioFragment();
                interventoDettaglioFragment.setArguments(bundle);
                newFragment = interventoDettaglioFragment;
                return interventoDettaglioFragment;
                //... and so on
        }
        return null;
    }

    @NonNull
    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        MyFragmentsInterface fragment = (MyFragmentsInterface) super.instantiateItem(container, position);

        activeFragments.put(position, fragment);

        return fragment;
    }

    @Override
    public CharSequence getPageTitle(int position) {
        return titles.get(position).getValue();
    }
}

添加/删除标签的方法（活动中）：

public void manageTabBefore() {
    //pre-code to decide if it has to be added or not

    if (hasToBeAdded) {
        isTabAdded = true;
        adapter.addTitle(podTabIndex, MyHeaderEnum.POD);
    } else if (hasToBeRemoved) {
        isTabAdded = false;
        adapter.removetitle(podTabIndex);
    }
}

已更改选项卡上的Tab布局

    tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() 
    {
        @Override
        public void onTabSelected(TabLayout.Tab tab) {
            //I also played a looooot with this
            int position = tab.getPosition();
            viewPager.setCurrentItem(position);
        }

        @Override
        public void onTabUnselected(TabLayout.Tab tab) {
        }

        @Override
        public void onTabReselected(TabLayout.Tab tab) {
        }
    });

我快要放弃了，该怎么做才能在不刷新当前标签和不更改所选标签之前添加一个标签？