让tablayout中的Tab平铺：在tablayout布局中写：

app:tabMaxWidth="0dp"
app:tabGravity="fill"
app:tabMode="fixed"

这是要放TabLayout的Fragment：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:orientation="vertical"

    xmlns:app="http://schemas.android.com/apk/res-auto"

    android:layout_width="match_parent"

    android:layout_height="match_parent">

    <android.support.design.widget.TabLayout

        android:id="@+id/tl"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        app:tabIndicatorColor="#FF00FF00"

        app:tabSelectedTextColor="#FF00FF00"

        app:tabTextColor="#FF000000"

        app:tabMode="scrollable"

        app:tabGravity="center"/>

    <android.support.v4.view.ViewPager

        android:id="@+id/viewpager"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"/>

</LinearLayout>

这是Fragment：

public class ZhuyeMyFragment extends Fragment{

    private String[] mTitle = new String[4];

    private String[] mData = new String[4];

    {

        for(int i=0;i<4;i++) {

            mTitle[i] = "title" + i;

            mData[i] = "data" + i;

        }

    }

    TabLayout mTabLayout ;

    ViewPager mViewPager ;

    FragmentPagerAdapter mAdapter;

    Zhuti zt;

    Zuixin zx;

    Zl zl;

    Rm rm;

    ArrayList<Fragment> flist;

    @Nullable

    @Override

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

        View view=inflater.inflate(R.layout.zhuye_layout,null);

        mTabLayout = (TabLayout)view.findViewById(R.id.tl);

        mViewPager = (ViewPager)view.findViewById(R.id.viewpager);

        FragmentManager man = getActivity().getSupportFragmentManager();

        initFragment();

        flist=new ArrayList<Fragment>();

        flist.add(zx);

        flist.add(zl);

        flist.add(rm);

        flist.add(zt);

        mTabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {

            @Override

            public void onTabSelected(TabLayout.Tab tab) {

                mViewPager.setCurrentItem(tab.getPosition());

            }

            @Override

            public void onTabUnselected(TabLayout.Tab tab) {

            }

            @Override

            public void onTabReselected(TabLayout.Tab tab) {

            }

        });

        final TabLayout.TabLayoutOnPageChangeListener listener =

                new TabLayout.TabLayoutOnPageChangeListener(mTabLayout);

        mViewPager.addOnPageChangeListener(listener);

        mAdapter= new FragmentAdapter(man,flist);

        mViewPager.setAdapter(mAdapter);

        mTabLayout.setTabsFromPagerAdapter(mAdapter);

        return view;

    }

    private void initFragment() {

        zt=new Zhuti();

        zx=new Zuixin();

        zl=new Zl();

        rm=new Rm();

    }

}
这是FragmentAdapter：

public class FragmentAdapter extends FragmentPagerAdapter {

    private String [] title = {"最新日报","热门","专栏","主题日报"};

    private List<Fragment> fragmentList;

    public FragmentAdapter(FragmentManager fm, List<Fragment> fragmentList) {

        super(fm);

        this.fragmentList = fragmentList;

    }

    @Override

    public Fragment getItem(int position) {

        return fragmentList.get(position);

    }

    @Override

    public int getCount() {

        return fragmentList.size();

    }

    @Override

    public CharSequence getPageTitle(int position) {

        return title[position];

    }

}