在刷卡后,使用RecyclerView复制碎片出现在ViewPager中

Question

使用RecyclerView的片段在ViewPager中存在问题.在刷卡后重新创建片段时,重复的RecyclerView会重叠.我正在使用ViewPager,Fragment,FragmentStatePagerAdapter

图1:RecyclerView第一次没问题.

图2:在扫描多个片段然后向后滑动到相同片段之后,复制片段在滚动时重叠.

使用FragmentStatePagerAdapter

class SlidingFragmentPagerAdapter extends FragmentStatePagerAdapter {
        SparseArray<FragmentMain> registeredFragments = new SparseArray<FragmentMain>();
        FragmentManager fm;

        public SlidingFragmentPagerAdapter(FragmentManager fm) {
            super(fm);
            this.fm = fm;
        }

        @Override
        public Fragment getItem(int position) {
            Calendar cal = Calendar.getInstance();
            cal.add(Calendar.DATE, -1 * (FragmentViewPager.MAX_PAGE - position - 1));

            return FragmentMain.newInstance(position + "", cal.getTime());
        }

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

        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            FragmentMain fragment = (FragmentMain)  super.instantiateItem(container, position);
            registeredFragments.put(position, fragment);
            return fragment;
        }

        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            registeredFragments.remove(position);
            super.destroyItem(container, position, object);
        }

        public FragmentMain getRegisteredFragment(int position) {
            return registeredFragments.get(position);
        }
    }

使用ViewPager

mViewPager = (ViewPager) view.findViewById(R.id.viewpager);
rootView.findViewById(R.id.img_floating_btn2);
mSlidingTabLayout = (SlidingTabLayout) view.findViewById(R.id.sliding_tabs);
mSlidingTabLayout.setDistributeEvenly(true);
adapter = new SlidingFragmentPagerAdapter(getFragmentManager());
mViewPager.setAdapter(adapter);
mViewPager.setCurrentItem(MAX_PAGE);
mSlidingTabLayout.setViewPager(mViewPager);

注意 我尝试使用mViewPager.setOffscreenPageLimit(adapter.getCount()); buti在ViewPager中有超过50个片段

Answer 1

我遇到了同样的问题，我有一个 ViewPager ，其 RootFragment 包含其他片段。我将这些片段添加到 RootFragment 中：

getFragmentManager().beginTransaction().add(containerLayout.getId(), ItemFragment.newInstance()).commit();

我通过将其更改为替换而不是添加来修复它。

getFragmentManager().beginTransaction().replace(containerLayout.getId(), ItemFragment.newInstance()).commit();

即使容器是空的，您也必须使用替换而不是添加！