java - TabLayout 不会填充

Question

我从一些设计支持库资源开始，特别是 TabLayout。

这是一个简单的 fragment ，但我无法填充我的 TabLayout， fragment 正常滑动，但我的 TabLayout 没有填充标题，正如我们在附图中看到的那样。 我不确定是否应该将 ViewPager 与 TabLayout 一起包装在 fragment 中，这对我来说很有意义。

关注，谢谢。

http://postimg.org/image/x1z6zvlqd/

主要 fragment Xml

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

    <android.support.design.widget.TabLayout
        android:id="@+id/tab_sliding_tabs_about"

        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:tabMode="scrollable"
        android:background="@color/yellow"
        />

    <android.support.v4.view.ViewPager
        android:id="@+id/vp_about_fragment_content"
        android:layout_width="match_parent"
        android:layout_height="0px"
        android:layout_weight="1"
        android:background="@android:color/white" />

</LinearLayout>

主要 fragment java

@Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

    }

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

        View rootView = inflater.inflate(R.layout.fragment_about, container, false);
        ViewPager viewPager = (ViewPager) rootView.findViewById(R.id.vp_about_fragment_content);
        mAdapter = new AboutPageAdapter(getFragmentManager(),
                getContext());
        viewPager.setAdapter(mAdapter);


        TabLayout tabLayout = (TabLayout) rootView.findViewById(R.id.tab_sliding_tabs_about);
        tabLayout.setupWithViewPager(viewPager);
        mAdapter.notifyDataSetChanged();
        return rootView;
    }

页面适配器java

public class AboutPageAdapter extends FragmentPagerAdapter {

    final   int    PAGE_COUNT  = 2;
    private String tabTitles[] = new String[]{"Tab A", "Tab B"};
    private Context context;

    public AboutPageAdapter(FragmentManager fm, Context context) {
        super(fm);
        this.context = context;
    }

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

    @Override
    public Fragment getItem(int position) {
        switch (position) {
            case 0:
                return FragA.newInstance(position);
            default:
                return FragB.newInstance(position);
        }

    }

    @Override
    public CharSequence getPageTitle(int position) {
        // Generate title based on item position
        return tabTitles[position];
    }
}

Answer 1

感谢您的所有提示，我能够使其工作:

    mViewPager.setAdapter(adapter);
    mTabLayout.post(new Runnable() {
        @Override
        public void run() {
            mTabLayout.setupWithViewPager(mViewPager);
        }
    });