AndroidTv Leanback - ArrayObjectAdapter 在空对象引用上崩溃

Question

尝试使用 LeanbackTabLayout 和 LeanbackViewPager 在我的 AndroidTv 应用程序中创建顶部导航，但不知何故我的 rowsAdapter 为 null 并在 setAdapter 上崩溃。当我调试时，我看到 ListRow 不为空。我做错了什么？

家庭活动：

public class HomeActivity extends FragmentActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);
        
        LeanbackTabLayout leanbackTabLayout = ActivityCompat.requireViewById(this, R.id.tablayout);
        leanbackTabLayout.setFocusable(true);
        
        LeanbackViewPager leanbackViewPager = ActivityCompat.requireViewById(this, R.id.viewpager);

        TablayoutAdapter adapter = new TablayoutAdapter(getSupportFragmentManager(), 3);
        leanbackViewPager.setAdapter(adapter);

        leanbackTabLayout.setupWithViewPager(leanbackViewPager);
    }
}

Tablayout 适配器：

public class TablayoutAdapter extends FragmentStatePagerAdapter {

    int tabCount;

    public TablayoutAdapter(@NonNull FragmentManager fm, int tabCount) {
        super(fm);
        this.tabCount = tabCount;

    }

    @NonNull
    @Override
    public Fragment getItem(int position) {
        return new HomeFragment();
    }

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

HomeActivity xml：

<?xml version="1.0" encoding="utf-8"?>
    <androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".HomeActivity">
    
        <androidx.leanback.tab.LeanbackTabLayout
            android:id="@+id/tablayout"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:focusable="true"
            android:nextFocusDown="@id/viewpager"
            />
    
        <androidx.leanback.tab.LeanbackViewPager
            android:id="@+id/viewpager"
            android:layout_width="match_parent"
            android:layout_height="match_parent"/>
    
    </androidx.coordinatorlayout.widget.CoordinatorLayout>

主页片段：

public class HomeFragment extends Fragment {
    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
            View view = inflater.inflate(R.layout.fragment_home, container, false);
        return view;
    }

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        ListRowPresenter lrp = new ListRowPresenter();
        final CardPresenter cardPresenter = new CardPresenter();
        ArrayObjectAdapter rowsAdapter = new ArrayObjectAdapter(lrp);

        for (int i = 0; i < 3; ++i) {
            ArrayObjectAdapter listRowAdapter = new ArrayObjectAdapter(cardPresenter);
            listRowAdapter.add(new Navigation("Tab1"));
            listRowAdapter.add(new Navigation("Tab2"));
            listRowAdapter.add(new Navigation("Tab3"));
            HeaderItem header = new HeaderItem(i, "Row " + i);
            System.out.println(header);
            System.out.println("hello");
            rowsAdapter.add(new ListRow(header, listRowAdapter));
        }
        RowsSupportFragment rowsSupportFragment = (RowsSupportFragment) getChildFragmentManager().findFragmentById(R.id.row1);
        System.out.println(rowsAdapter);
        System.out.println("hello");
        rowsSupportFragment.setAdapter(rowsAdapter);
    }
}

HomeFragment xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <FrameLayout
        android:id="@+id/row1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</LinearLayout>