<?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"

     xmlns:tools="http://schemas.android.com/tools"

     android:layout_width="match_parent"

     android:layout_height="match_parent"

     android:orientation="vertical"

     tools:context="com.plbear.yyj.myapplication.MainActivity">

     <android.support.design.widget.TabLayout

         android:id="@+id/tab"

         android:layout_width="match_parent"

         android:layout_height="40dp"

         app:tabGravity="fill"

         app:tabIndicatorColor="#4978ef"

         app:tabIndicatorHeight="2dp"

         app:tabMode="scrollable"

         app:tabSelectedTextColor="#4978ef"

         app:tabTextColor="#222222"></android.support.design.widget.TabLayout>

     <android.support.v4.view.ViewPager

         android:id="@+id/view_pager"

         android:layout_width="match_parent"

         android:layout_height="wrap_content"></android.support.v4.view.ViewPager>

 </LinearLayout>

 package com.plbear.yyj.myapplication

 import android.os.Bundle

 import android.support.design.widget.Snackbar

 import android.support.design.widget.TabLayout

 import android.support.v4.app.Fragment

 import android.support.v4.app.FragmentPagerAdapter

 import android.support.v7.app.AppCompatActivity

 import android.view.Menu

 import android.view.MenuItem

 import kotlinx.android.synthetic.main.activity_main.*

 class MainActivity : AppCompatActivity() {

     var mFragList = ArrayList<Fragment>()

     var adapter = object:FragmentPagerAdapter(supportFragmentManager){

         override fun getItem(position: Int): Fragment {

             return mFragList[position]

         }

         override fun getCount(): Int {

             return 2

         }

     }

     override fun onCreate(savedInstanceState: Bundle?) {

         super.onCreate(savedInstanceState)

         setContentView(R.layout.activity_main)

         initViewPager() //先将各个fragment加入到viewpager中

         initTabLayout(); //初始化tablayout

     }

     fun initTabLayout(){

         tab.setupWithViewPager(view_pager)

         tab.setTabsFromPagerAdapter(adapter)

         tab.tabMode = TabLayout.MODE_FIXED

         tab.getTabAt(0)?.setText("第一页")

         tab.getTabAt(1)?.setText("第二页")

     }

     fun initViewPager(){

         mFragList.add(Fragment1())

         mFragList.add(Fragment2())

         view_pager.adapter = adapter

     }

 }

dependencies {

    implementation fileTree(dir: 'libs', include: ['*.jar'])

    implementation"org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"

    compile 'com.android.support:design:26.0.0-beta1'

    compile 'com.android.support:support-v4:26.0.0-beta1'

    implementation 'com.android.support:appcompat-v7:26.0.0-beta1'

    implementation 'com.android.support.constraint:constraint-layout:1.0.2'

    testImplementation 'junit:junit:4.12'

    androidTestImplementation 'com.android.support.test:runner:0.5'

    androidTestImplementation 'com.android.support.test.espresso:espresso-core:2.2.2'

}