package com.xqx.com.tablayoutdemo;

 import android.support.design.widget.TabLayout;

 import android.support.v4.app.Fragment;

 import android.support.v4.app.FragmentActivity;

 import android.support.v4.view.ViewPager;

 import android.os.Bundle;

 import java.util.ArrayList;

 import java.util.List;

 public class MainActivity extends FragmentActivity {

     private TabLayout tabLayout;

     private ViewPager viewPager;

     //四个fragment

     private OneFragment oneFragment;

     private TwoFragment twoFragment;

     private ThreeFragment threeFragment;

     private FourFragment fourFragment;

     //适配器

     private MyAdapter adapter;

     private List<Fragment> fragments;           //fragment集合

     private List<String> titles;                //tab标题集合

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_main);

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

         viewPager = (ViewPager) findViewById(R.id.viewpager);

         //创建四个Fragment对象

         oneFragment = new OneFragment();

         twoFragment = new TwoFragment();

         threeFragment = new ThreeFragment();

         fourFragment = new FourFragment();

         //将四个Fragment对象添加到集合中

         fragments = new ArrayList<>();

         fragments.add(oneFragment);

         fragments.add(twoFragment);

         fragments.add(threeFragment);

         fragments.add(fourFragment);

         //给Tab添加标题

         titles = new ArrayList<>();

         titles.add("one");

         titles.add("two");

         titles.add("three");

         titles.add("four");

         //创建适配器

         adapter = new MyAdapter(getSupportFragmentManager(),fragments,titles);

         //viewpager绑定适配器

         viewPager.setAdapter(adapter);

         //tabLayout绑定viewpager

         tabLayout.setupWithViewPager(viewPager);

     }

 }

 MainActivity.java