优化

app/src/main/java/io/legado/app/constant/PreferKey.kt

@@ -137,6 +137,7 @@ object PreferKey {
     const val batchChangeSourceDelay = "batchChangeSourceDelay"
     const val openBookInfoByClickTitle = "openBookInfoByClickTitle"
     const val defaultHomePage = "defaultHomePage"
+    const val showBookshelfFastScroller = "showBookshelfFastScroller"
 
     const val cPrimary = "colorPrimary"
     const val cAccent = "colorAccent"

app/src/main/java/io/legado/app/help/config/AppConfig.kt

@@ -403,6 +403,12 @@ object AppConfig : SharedPreferences.OnSharedPreferenceChangeListener {
             appCtx.putPrefBoolean(PreferKey.openBookInfoByClickTitle, value)
         }
 
+    var showBookshelfFastScroller: Boolean
+        get() = appCtx.getPrefBoolean(PreferKey.showBookshelfFastScroller, false)
+        set(value) {
+            appCtx.putPrefBoolean(PreferKey.showBookshelfFastScroller, value)
+        }
+
     var contentSelectSpeakMod: Int
         get() = appCtx.getPrefInt(PreferKey.contentSelectSpeakMod)
         set(value) {

app/src/main/java/io/legado/app/ui/main/bookshelf/BaseBookshelfFragment.kt

@@ -168,6 +168,10 @@ abstract class BaseBookshelfFragment(layoutId: Int) : VMBaseFragment<BookshelfVi
                         AppConfig.showWaitUpCount = swShowWaitUpBooks.isChecked
                         activityViewModel.postUpBooksLiveData(true)
                     }
+                    if (AppConfig.showBookshelfFastScroller != swShowBookshelfFastScroller.isChecked) {
+                        AppConfig.showBookshelfFastScroller = swShowBookshelfFastScroller.isChecked
+                        postEvent(EventBus.BOOKSHELF_REFRESH, "")
+                    }
                     if (bookshelfSort != rgSort.getCheckedIndex()) {
                         AppConfig.bookshelfSort = rgSort.getCheckedIndex()
                         upSort()

app/src/main/java/io/legado/app/ui/main/bookshelf/style1/books/BooksFragment.kt

@@ -86,6 +86,7 @@ class BooksFragment() : BaseFragment(R.layout.fragment_books),
 
     private fun initRecyclerView() {
         binding.rvBookshelf.setEdgeEffectColor(primaryColor)
+        binding.rvBookshelf.setFastScrollEnabled(AppConfig.showBookshelfFastScroller)
         binding.refreshLayout.setColorSchemeColors(accentColor)
         binding.refreshLayout.setOnRefreshListener {
             binding.refreshLayout.isRefreshing = false
@@ -275,6 +276,7 @@ class BooksFragment() : BaseFragment(R.layout.fragment_books),
         observeEvent<String>(EventBus.BOOKSHELF_REFRESH) {
             booksAdapter.notifyDataSetChanged()
             startLastUpdateTimeJob()
+            binding.rvBookshelf.setFastScrollEnabled(AppConfig.showBookshelfFastScroller)
         }
     }
-}
+}