java - Fragment 白页上的 RecyclerView

Question

我已经为选项卡创建了一个 fragment ，并按照代码在该 fragment 中放置了一个 RecyclerView:

fragment 1 Java:

@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        mView = inflater.inflate(R.layout.fragment_two, container, false);
        mRecyclerView = (RecyclerView) mView.findViewById(R.id.my_recycler_view);
        mRecyclerView.setHasFixedSize(true);
        mLayoutManager = new LinearLayoutManager(getContext());
        mRecyclerView.setLayoutManager(mLayoutManager);
        mAdapter = new MyRecyclerViewAdapter(getDataSet());
        mRecyclerView.setAdapter(mAdapter);

        return inflater.inflate(R.layout.fragment_two, container, false);
    }

fragment 1 XML:

    <android.support.v7.widget.RecyclerView
            android:id="@+id/my_recycler_view"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:scrollbars="vertical"/>

Activity 调用 fragment 选项卡:

 private void setupViewPager(ViewPager viewPager) {
            ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
            adapter.addFragment(new OneFragment(), "Cliente");
            adapter.addFragment(new TwoFragment(), "Prodotti");
            viewPager.setAdapter(adapter);
        }

        class ViewPagerAdapter extends FragmentPagerAdapter {
            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);
            }

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

我没有任何错误，但调试显示:

E/RecyclerView: No adapter attached; skipping layout

我在谷歌上搜索过，但没有解决我的问题，你有什么建议吗？如果您需要更多代码，请询问，无论如何，谢谢..

Answer 1

问题出在线条

    mView = inflater.inflate(R.layout.fragment_two, container, false);
    ........

    return inflater.inflate(R.layout.fragment_two, container, false);

当您编写return inflater.inflate(R.layout.fragment_two,container, false);时，您正在重新膨胀 View 并返回没有任何初始化的新 View 。

<小时/>

你只需要返回之前膨胀的 View (即mView)。

所以你的代码必须像

mView = inflater.inflate(R.layout.fragment_two, container, false);
        mRecyclerView = (RecyclerView) mView.findViewById(R.id.my_recycler_view);
        mRecyclerView.setHasFixedSize(true);
        mLayoutManager = new LinearLayoutManager(getContext());
        mRecyclerView.setLayoutManager(mLayoutManager);
        mAdapter = new MyRecyclerViewAdapter(getDataSet());
        mRecyclerView.setAdapter(mAdapter);

        return mView;