tabLayout和ViewPager的滑动关联 以及tabLayout和ViewPager的布局

package duanxinmeng.bwie.com.sanzhoukao;import android.os.Bundle;import android.support.annotation.Nullable;import android.support.design.widget.TabLayout;import android.support.v4.app.Fragment;import android.support.v4.app.FragmentPagerAdapter;import android.support.v4.view.ViewPager;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import java.util.ArrayList;import java.util.List;/** * Created by Administrator on 2017/10/23/023. */public class Fragment_Sy extends Fragment {    private TabLayout tabLayout;    private ViewPager viewPager;    private List<String> list;    @Nullable    @Override    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {        View view = inflater.inflate(R.layout.fragment_sy,container,false);        tabLayout = (TabLayout) view.findViewById(R.id.tab_layout);        viewPager = (ViewPager) view.findViewById(R.id.pager);        return view;    }    @Override    public void onActivityCreated(@Nullable Bundle savedInstanceState) {        super.onActivityCreated(savedInstanceState);        list = new ArrayList<>();        list.add("推荐");        list.add("课程");        list.add("实践");        list.add("职业路径");        viewPager.setAdapter(new FragmentPagerAdapter(getChildFragmentManager()) {            @Override            public CharSequence getPageTitle(int position) {                return list.get(position);            }            @Override            public Fragment getItem(int position) {                Fragment fragment = null;                switch (position){                    case 0:                        fragment = new Fragment_Tj();                        break;                    case 1:                        fragment = new Fragment_Kc();                        break;                    case 2:                        fragment = new Fragment_Sj();                        break;                    case 3:                        fragment = new Fragment_Zy();                        break;                }                return fragment;            }            @Override            public int getCount() {                return list.size();            }        });        //关联        tabLayout.setupWithViewPager(viewPager);    }}

<?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:orientation="vertical"    android:background="@drawable/ad"    android:layout_height="match_parent">    <android.support.design.widget.TabLayout        android:id="@+id/tab_layout"        android:layout_width="match_parent"        android:layout_height="50px"        app:tabGravity="center"        app:tabIndicatorColor="@color/colorAccent"        app:tabMode="scrollable"        app:tabSelectedTextColor="@color/colorPrimaryDark"        app:tabTextColor="@color/colorPrimary" >    </android.support.design.widget.TabLayout>    <android.support.v4.view.ViewPager        android:id="@+id/pager"        android:layout_width="match_parent"        android:layout_height="match_parent"></android.support.v4.view.ViewPager></LinearLayout>