在另一个片段内创建的ViewPager中保存片段内的RecyclerView状态

public Parcelable saveRecyclerViewState() {
    if (recyclerView != null) {
        return recyclerView.getLayoutManager().onSaveInstanceState();
    }
    return null;
}

private SparseArray<Parcelable> recyclerViewStates = new SparseArray<>();

public void saveRecyclerViewState(int position, Parcelable state) {
    recyclerViewStates.put(position, state);
}

public Parcelable restoreRecyclerViewState(int position) {
    Parcelable state = recyclerViewStates.get(position);
    recyclerViewStates.remove(position);
    return state;
}

viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
    }

    @Override
    public void onPageSelected(int position) {
        // 保存当前页面的RecyclerView状态
        int currentPosition = viewPager.getCurrentItem();
        Parcelable state = fragmentAdapter.saveRecyclerViewState();
        saveRecyclerViewState(currentPosition, state);

        // 恢复切换后页面的RecyclerView状态
        Parcelable newState = restoreRecyclerViewState(position);
        if (newState != null) {
            fragmentAdapter.restoreRecyclerViewState(newState);
        }
    }

    @Override
    public void onPageScrollStateChanged(int state) {
    }
});

public Parcelable saveRecyclerViewState() {
    if (currentFragment != null) {
        return currentFragment.saveRecyclerViewState();
    }
    return null;
}

public void restoreRecyclerViewState(Parcelable state) {
    if (currentFragment != null) {
        currentFragment.restoreRecyclerViewState(state);
    }
}