横向滑动

###横向滑动布局

<android.support.design.widget.TabLayout
    android:id="@+id/tab"
    android:layout_width="0dp"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_height="wrap_content"></android.support.design.widget.TabLayout>
    <android.support.v4.view.ViewPager
        android:id="@+id/Pager"
        android:layout_width="0dp"
        android:layout_height="0dp"

        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toBottomOf="@id/tab"></android.support.v4.view.ViewPager>

###适配器

public class Oneadapter extends FragmentPagerAdapter {
    public String[] s = new String[]{
            "关注", "推荐", "热点", "科技", "视频", "数码", "汽车"
    };
    public Oneadapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int i) {
        return new FragmentTwo();
    }

    @Override
    public int getCount() {
        return s.length;
    }

    @Nullable
    @Override
    public CharSequence getPageTitle(int position) {
        return s[position];
    }
}

###核心代码

public class FragmentOne extends Fragment {
    private ViewPager Pager;
    private TabLayout tab;
    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragmentone,container,false);
    }

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        Pager = view.findViewById(R.id.Pager);
        tab = view.findViewById(R.id.tab);
        Pager.setAdapter(new Oneadapter(getChildFragmentManager()));
        tab.setupWithViewPager(Pager);
    }
}