用kotlin写一个适用于安卓的关注和粉丝界面，要求要在同一个activity中，通过关注和粉丝两个标签来切换列表，列表使用recycleview，用xml语言写布局文件

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好的，我明白了。关注和粉丝界面可以通过使用ViewPager实现，ViewPager中包含两个Fragment，分别加载关注和粉丝的RecycleView，然后在主Activity中通过标签切换ViewPager页。以下是一份实现代码，你可以作为参考：

1.首先，在主activity布局文件中，添加ViewPager和标签栏TabLayout：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="match_parent">

     <androidx.viewpager.widget.ViewPager
         android:id="@+id/viewPager"
         android:layout_width="match_parent"
         android:layout_height="match_parent"/>

     <com.google.android.material.tabs.TabLayout
         android:id="@+id/tabs"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         app:tabMode="fixed"
         app:tabGravity="fill"/>

</RelativeLayout>

2.在主activity中初始化ViewPager和TabLayout，设置TabLayout和ViewPager的关联：

private lateinit var viewPager: ViewPager
private lateinit var tabs: TabLayout

override fun onCreate(savedInstanceState: Bundle?) {
     super.onCreate(savedInstanceState)
     setContentView(R.layout.activity_main)

     viewPager = findViewById(R.id.viewPager)
     tabs = findViewById(R.id.tabs)

     setupViewPager()
     tabs.setupWithViewPager(viewPager)
}

private fun setupViewPager() {
     val adapter = ViewPagerAdapter(supportFragmentManager)
     adapter.addFragment(FollowingFragment(), "关注")
     adapter.addFragment(FollowerFragment(), "粉丝")
     viewPager.adapter = adapter
}

internal class ViewPagerAdapter(manager: FragmentManager) : FragmentPagerAdapter(manager) {

     private val fragmentList: MutableList<Fragment> = ArrayList()
     private val titleList: MutableList<String> = ArrayList()

     override fun getItem(position: Int): Fragment {
         return fragmentList[position]
     }

     override fun getCount(): Int {
         return fragmentList.size
     }

     fun addFragment(fragment: Fragment, title: String) {
         fragmentList.add(fragment)
         titleList.add(title)
     }

     override fun getPageTitle(position: Int): CharSequence {
         return titleList[position]
     }
}

3.创建两个Fragment，分别加载关注和粉丝的RecycleView：

FollowingFragment.kt

class FollowingFragment : Fragment() {

     private lateinit var recyclerView: RecyclerView
     private lateinit var followingAdapter: FollowingAdapter

     override fun onCreateView(
         inflater: LayoutInflater,
         container: ViewGroup?,
         savedInstanceState: Bundle?
     ): View? {
         val view = inflater.inflate(R.layout.fragment_following, container, false)

         recyclerView = view.findViewById(R.id.recyclerView_following)
         recyclerView.setHasFixedSize(true)
         recyclerView.layoutManager = LinearLayoutManager(activity)
         followingAdapter = FollowingAdapter(getFollowingList())
         recyclerView.adapter = followingAdapter

         return view
     }

     private fun getFollowingList(): MutableList<String> {
         val list = mutableListOf<String>()
         list.add("小明")
         list.add("小红")
         list.add("小芳")
         list.add("小青")
         //添加想要的数据
         return list
     }
}

FollowerFragment.kt

class FollowerFragment : Fragment() {

     private lateinit var recyclerView: RecyclerView
     private lateinit var followerAdapter: FollowerAdapter

     override fun onCreateView(
         inflater: LayoutInflater,
         container: ViewGroup?,
         savedInstanceState: Bundle?
     ): View? {
         val view = inflater.inflate(R.layout.fragment_follower, container, false)

         recyclerView = view.findViewById(R.id.recyclerView_follower)
         recyclerView.setHasFixedSize(true)
         recyclerView.layoutManager = LinearLayoutManager(activity)
         followerAdapter = FollowerAdapter(getFollowerList())
         recyclerView.adapter = followerAdapter

         return view
     }

     private fun getFollowerList(): MutableList<String> {
         val list = mutableListOf<String>()
         list.add("小明")
         list.add("小红")
         list.add("小芳")
         list.add("小青")
         //添加想要的数据
         return list
     }
}

4.最后，在layout文件夹中创建两个RecycleView布局文件：

fragment_following.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent">

     <androidx.recyclerview.widget.RecyclerView
         android:id="@+id/recyclerView_following"
         android:layout_width="match_parent"
         android:layout_height="match_parent"/>

</RelativeLayout>

fragment_follower.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent">

     <androidx.recyclerview.widget.RecyclerView
         android:id="@+id/recyclerView_follower"
         android:layout_width="match_parent"
         android:layout_height="match_parent"/>

</RelativeLayout>

以上就是Kotlin写的适用于安卓的关注和粉丝界面的实现，希望对您有所帮助。