TabLayout 不显示 Android

Question

不明白为什么我的 TabLayout 没有显示在我的 Fragment 下一些帮助。这是我的代码：

public class ViewPagerFragment extends Fragment {

    public static final String KEY_NEW_INDEX = "key_new_index";
    private ViewPager mViewPager;
    private TabLayout mTabLayout;

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

        final View view = inflater.inflate(R.layout.fragment_view_pager, container, false);

        final SportFragment sportFragment = new SportFragment();
        Bundle bundle = new Bundle();
        sportFragment.setArguments(bundle);

        final BuzzFragment buzzFragment = new BuzzFragment();
        bundle = new Bundle();
        buzzFragment.setArguments(bundle);

        mViewPager = (ViewPager) view.findViewById(R.id.viewPager);
        mTabLayout = (TabLayout) view.findViewById(R.id.tabLayout);


        mViewPager.setAdapter(new FragmentPagerAdapter(getChildFragmentManager()) {
            @Override
            public Fragment getItem(int position) {
                return position == 0 ? sportFragment : buzzFragment;
            }

            @Override
            public CharSequence getPageTitle(int position) {
                return position == 0 ? "Sport" : "Buzz";
            }

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

        });

                mTabLayout.setupWithViewPager(mViewPager);


        return view;
    }
}

这是我的 xml 文件：

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
             xmlns:tools="http://schemas.android.com/tools"
             android:layout_width="match_parent"
             android:layout_height="match_parent"
             tools:context="com.example.ideo.testfrag.FragmentUI.Fragments.ViewPagerFragment">

    <android.support.design.widget.TabLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/tabLayout"
        android:background="@color/colorPrimary"/>

    <android.support.v4.view.ViewPager
        android:id="@+id/viewPager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</FrameLayout>

Answer 1

在我的 MainActivity 托管几个选项卡的情况下。我这样做：

主要活动JAVA：

    public class MainActivity extends AppCompatActivity {

TabLayout tabLayout;

@Override
protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);



    int position = 0;

    tabLayout = (TabLayout) findViewById(R.id.tab_layout);

    tabLayout.addTab(tabLayout.newTab().setText("HOME"));
    tabLayout.addTab(tabLayout.newTab().setText("Search"));
    tabLayout.addTab(tabLayout.newTab().setText("PROFILE"));
    tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);

    final ViewPager viewPager = (ViewPager) findViewById(R.id.pager);
    final PagerAdapter adapter = new PagerAdapter
            (getSupportFragmentManager(), tabLayout.getTabCount());
    viewPager.setAdapter(adapter);
    viewPager.setOffscreenPageLimit(2);
    viewPager.setCurrentItem(position);
    viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
    tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
        @Override
        public void onTabSelected(TabLayout.Tab tab) {

            viewPager.setCurrentItem(tab.getPosition());

            if(tab.getPosition() == 0){

                InputMethodManager inputMethodManager = (InputMethodManager) getSystemService(INPUT_METHOD_SERVICE);
                inputMethodManager.hideSoftInputFromWindow(viewPager.getWindowToken(), 0);

            }
            else if(tab.getPosition() == 1){

                InputMethodManager inputMethodManager = (InputMethodManager) getSystemService(INPUT_METHOD_SERVICE);
                inputMethodManager.hideSoftInputFromWindow(viewPager.getWindowToken(), 0);

            }
            else if(tab.getPosition() == 2){

                InputMethodManager inputMethodManager = (InputMethodManager) getSystemService(INPUT_METHOD_SERVICE);
                inputMethodManager.hideSoftInputFromWindow(viewPager.getWindowToken(), 0);

            }

        }

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

        }

        @Override
        public void onTabReselected(TabLayout.Tab tab) {

        }});

  }
}

主要活动 XML

  <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen"
tools:context="celebritytime.com.celeberitytime.MainActivity">


<FrameLayout
    android:id="@+id/container_id"
    android:layout_width="0dp"
    android:layout_height="match_parent">

</FrameLayout>

<android.support.design.widget.TabLayout
    android:id="@+id/tab_layout"
    android:tag="NationFragmentTag"
    android:showDividers="none"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:background="#020202"
    android:minHeight="?attr/actionBarSize"
    android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"/>

<android.support.v4.view.ViewPager
    android:id="@+id/pager"
    android:layout_width="match_parent"
    android:layout_height="fill_parent"
    android:layout_below="@id/tab_layout"/>

</RelativeLayout>

如果您需要 ViewPager 代码，请告诉我。