优化

app/src/main/java/io/legado/app/ui/book/toc/TocActivity.kt

@@ -1,3 +1,5 @@
+@file:Suppress("DEPRECATION")
+
 package io.legado.app.ui.book.toc
 
 import android.content.Intent
@@ -8,9 +10,8 @@ import androidx.activity.viewModels
 import androidx.appcompat.widget.SearchView
 import androidx.core.view.isGone
 import androidx.fragment.app.Fragment
-import androidx.viewpager2.adapter.FragmentStateAdapter
+import androidx.fragment.app.FragmentPagerAdapter
 import com.google.android.material.tabs.TabLayout
-import com.google.android.material.tabs.TabLayoutMediator
 import io.legado.app.R
 import io.legado.app.base.VMBaseActivity
 import io.legado.app.databinding.ActivityChapterListBinding
@@ -37,12 +38,7 @@ class TocActivity : VMBaseActivity<ActivityChapterListBinding, TocViewModel>() {
         tabLayout.isTabIndicatorFullWidth = false
         tabLayout.setSelectedTabIndicatorColor(accentColor)
         binding.viewPager.adapter = TabFragmentPageAdapter()
-        TabLayoutMediator(tabLayout, binding.viewPager) { tab, position ->
-            when (position) {
-                0 -> tab.setText(R.string.chapter_list)
-                else -> tab.setText(R.string.bookmark)
-            }
-        }.attach()
+        tabLayout.setupWithViewPager(binding.viewPager)
         intent.getStringExtra("bookUrl")?.let {
             viewModel.initBook(it)
         }
@@ -98,16 +94,25 @@ class TocActivity : VMBaseActivity<ActivityChapterListBinding, TocViewModel>() {
         }
     }
 
-    private inner class TabFragmentPageAdapter : FragmentStateAdapter(this) {
+    @Suppress("DEPRECATION")
+    private inner class TabFragmentPageAdapter :
+        FragmentPagerAdapter(supportFragmentManager, BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT) {
+
+        override fun getItem(position: Int): Fragment {
+            return when (position) {
+                1 -> BookmarkFragment()
+                else -> ChapterListFragment()
+            }
+        }
 
-        override fun getItemCount(): Int {
+        override fun getCount(): Int {
             return 2
         }
 
-        override fun createFragment(position: Int): Fragment {
+        override fun getPageTitle(position: Int): CharSequence {
             return when (position) {
-                0 -> ChapterListFragment()
-                else -> BookmarkFragment()
+                1 -> getString(R.string.bookmark)
+                else -> getString(R.string.chapter_list)
             }
         }
 

app/src/main/res/layout/activity_chapter_list.xml

@@ -12,7 +12,7 @@
         app:contentInsetStartWithNavigation="0dp"
         app:contentLayout="@layout/view_tab_layout" />
 
-    <androidx.viewpager2.widget.ViewPager2
+    <androidx.viewpager.widget.ViewPager
         android:id="@+id/view_pager"
         android:layout_width="match_parent"
         android:layout_height="match_parent" />