Bottomsheet对话框片段Viewpager项没有显示？

Question

这是DialogFragment类：

public class BottomSheetFragment extends BottomSheetDialogFragment {

TabLayout tabLayout;
ViewPager viewPager;
FilterAdapterBottom viewPagerAdapter;


@Override
public void setupDialog(Dialog dialog, int style) {
    super.setupDialog(dialog, style);

    View view = LayoutInflater.from(getContext()).inflate(R.layout.fragment_bottom_sheet, null);
    dialog.setContentView(view);

    viewPager = view.findViewById(R.id.viewPager);

    viewPagerAdapter = new FilterAdapterBottom(getFragmentManager());
    tabLayout = view.findViewById(R.id.tabs);
    tabLayout.setupWithViewPager(viewPager);
    viewPager.setAdapter(viewPagerAdapter);
    tabLayout.addOnTabSelectedListener(new TabLayout.ViewPagerOnTabSelectedListener(viewPager) {
        @Override
        public void onTabSelected(TabLayout.Tab tab) {
            viewPager.setCurrentItem(tab.getPosition());

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

        }
    });

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

        }

        @Override
        public void onPageSelected(int position) {

        }

        @Override
        public void onPageScrollStateChanged(int state) {

        }
    });


    CoordinatorLayout.LayoutParams params = (CoordinatorLayout.LayoutParams) ((View) view.getParent()).getLayoutParams();
    CoordinatorLayout.Behavior behavior = params.getBehavior();

    if (behavior != null && behavior instanceof BottomSheetBehavior) {
        ((BottomSheetBehavior) behavior).setBottomSheetCallback(new BottomSheetBehavior.BottomSheetCallback() {
            @Override
            public void onStateChanged(@NonNull View bottomSheet, int newState) {
                String state = "";

                switch (newState) {
                    case BottomSheetBehavior.STATE_DRAGGING: {
                        state = "DRAGGING";
                        break;
                    }
                    case BottomSheetBehavior.STATE_SETTLING: {
                        state = "SETTLING";
                        break;
                    }
                    case BottomSheetBehavior.STATE_EXPANDED: {
                        state = "EXPANDED";
                        break;
                    }
                    case BottomSheetBehavior.STATE_COLLAPSED: {
                        state = "COLLAPSED";
                        break;
                    }
                    case BottomSheetBehavior.STATE_HIDDEN: {
                        dismiss();
                        state = "HIDDEN";
                        break;
                    }
                }

                Toast.makeText(getContext(), "Bottom Sheet State Changed to: " + state, Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onSlide(@NonNull View bottomSheet, float slideOffset) {
            }
        });
    }
}}

这是XML类

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    >

    <com.google.android.material.tabs.TabLayout
        android:id="@+id/tabs"
        android:layout_marginTop="15dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:tabGravity="fill"
        app:tabIndicator="@color/button_red_back"
        app:tabMode="fixed" />

    <androidx.viewpager.widget.ViewPager
        android:id="@+id/viewPagerDialog"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        />


</LinearLayout>

这是适配器：

public class FilterAdapterBottom extends FragmentPagerAdapter {

public FilterAdapterBottom(FragmentManager fm) {
    super(fm);
}

@Override
public Fragment getItem(int position) {
    Fragment fragment = null;
    if (position == 0)
    {
        fragment = new DateFilter();
    }
    else if (position == 1)
    {
        fragment = new EventFilter_fragment();
    }
    return fragment;
}

@Override
public int getCount() {
    return 2;
}

@Override
public CharSequence getPageTitle(int position) {
    String title = null;
    if (position == 0)
    {
        title = "Date Filters";
    }
    else if (position == 1)
    {
        title = "Event Filters";
    }

    return title;
}}

和内部活动，我正在使用像这样。唯一的选项卡布局不显示viewpager内容。

请帮助我，我会在这里感谢所有答案。