优化

app/src/main/java/io/legado/app/ui/main/bookshelf/style1/BookshelfFragment1.kt

@@ -27,6 +27,7 @@ import io.legado.app.utils.putPrefInt
 import io.legado.app.utils.setEdgeEffectColor
 import io.legado.app.utils.toastOnUi
 import io.legado.app.utils.viewbindingdelegate.viewBinding
+import kotlinx.coroutines.Job
 import kotlinx.coroutines.flow.collect
 import kotlinx.coroutines.launch
 
@@ -44,7 +45,7 @@ class BookshelfFragment1 : BaseBookshelfFragment(R.layout.fragment_bookshelf),
     }
     private val bookGroups = mutableListOf<BookGroup>()
     private val fragmentMap = hashMapOf<Long, BooksFragment>()
-
+    private var groupsFlowJob: Job? = null
     override val groupId: Long get() = selectedGroup.groupId
 
     override val books: List<Book>
@@ -73,7 +74,8 @@ class BookshelfFragment1 : BaseBookshelfFragment(R.layout.fragment_bookshelf),
     }
 
     private fun initBookGroupData() {
-        launch {
+        groupsFlowJob?.cancel()
+        groupsFlowJob = launch {
             appDb.bookGroupDao.flowShow().collect {
                 upGroup(it)
             }

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

@@ -45,9 +45,17 @@ class BooksFragment() : BaseFragment(R.layout.fragment_books),
     }
 
     private val binding by viewBinding(FragmentBooksBinding::bind)
-    private val activityViewModel: MainViewModel
+    private val activityViewModel by activityViewModels<MainViewModel>()
-            by activityViewModels()
+    private val bookshelfLayout by lazy {
-    private lateinit var booksAdapter: BaseBooksAdapter<*>
+        getPrefInt(PreferKey.bookshelfLayout)
+    }
+    private val booksAdapter: BaseBooksAdapter<*> by lazy {
+        if (bookshelfLayout == 0) {
+            BooksAdapterList(requireContext(), this)
+        } else {
+            BooksAdapterGrid(requireContext(), this)
+        }
+    }
     private var booksFlowJob: Job? = null
     private var position = 0
     private var groupId = -1L
@@ -68,13 +76,10 @@ class BooksFragment() : BaseFragment(R.layout.fragment_books),
             binding.refreshLayout.isRefreshing = false
             activityViewModel.upToc(booksAdapter.getItems())
         }
-        val bookshelfLayout = getPrefInt(PreferKey.bookshelfLayout)
         if (bookshelfLayout == 0) {
             binding.rvBookshelf.layoutManager = LinearLayoutManager(context)
-            booksAdapter = BooksAdapterList(requireContext(), this)
         } else {
             binding.rvBookshelf.layoutManager = GridLayoutManager(context, bookshelfLayout + 2)
-            booksAdapter = BooksAdapterGrid(requireContext(), this)
         }
         binding.rvBookshelf.adapter = booksAdapter
         booksAdapter.registerAdapterDataObserver(object : RecyclerView.AdapterDataObserver() {

app/src/main/java/io/legado/app/ui/main/bookshelf/style2/BookshelfFragment2.kt

@@ -41,10 +41,20 @@ class BookshelfFragment2 : BaseBookshelfFragment(R.layout.fragment_bookshelf1),
     BaseBooksAdapter.CallBack {
 
     private val binding by viewBinding(FragmentBookshelf1Binding::bind)
-    private lateinit var booksAdapter: BaseBooksAdapter<*>
+    private val bookshelfLayout by lazy {
-    override var groupId = AppConst.bookGroupNoneId
+        getPrefInt(PreferKey.bookshelfLayout)
-    private var booksFlowJob: Job? = null
+    }
+    private val booksAdapter: BaseBooksAdapter<*> by lazy {
+        if (bookshelfLayout == 0) {
+            BooksAdapterList(requireContext(), this)
+        } else {
+            BooksAdapterGrid(requireContext(), this)
+        }
+    }
     private var bookGroups: List<BookGroup> = emptyList()
+    private var groupsFlowJob: Job? = null
+    private var booksFlowJob: Job? = null
+    override var groupId = AppConst.bookGroupNoneId
     override var books: List<Book> = emptyList()
 
     override fun onFragmentCreated(view: View, savedInstanceState: Bundle?) {
@@ -61,13 +71,10 @@ class BookshelfFragment2 : BaseBookshelfFragment(R.layout.fragment_bookshelf1),
             binding.refreshLayout.isRefreshing = false
             activityViewModel.upToc(books)
         }
-        val bookshelfLayout = getPrefInt(PreferKey.bookshelfLayout)
         if (bookshelfLayout == 0) {
             binding.rvBookshelf.layoutManager = LinearLayoutManager(context)
-            booksAdapter = BooksAdapterList(requireContext(), this)
         } else {
             binding.rvBookshelf.layoutManager = GridLayoutManager(context, bookshelfLayout + 2)
-            booksAdapter = BooksAdapterGrid(requireContext(), this)
         }
         binding.rvBookshelf.adapter = booksAdapter
         booksAdapter.registerAdapterDataObserver(object : RecyclerView.AdapterDataObserver() {
@@ -91,7 +98,8 @@ class BookshelfFragment2 : BaseBookshelfFragment(R.layout.fragment_bookshelf1),
 
     @SuppressLint("NotifyDataSetChanged")
     private fun initGroupData() {
-        launch {
+        groupsFlowJob?.cancel()
+        groupsFlowJob = launch {
             appDb.bookGroupDao.flowShow().collect {
                 if (it != bookGroups) {
                     bookGroups = it

app/src/main/java/io/legado/app/ui/main/rss/RssFragment.kt

@@ -41,6 +41,7 @@ class RssFragment : VMBaseFragment<RssSourceViewModel>(R.layout.fragment_rss),
     private val searchView: SearchView by lazy {
         binding.titleBar.findViewById(R.id.search_view)
     }
+    private var groupsFlowJob: Job? = null
     private var rssFlowJob: Job? = null
     private val groups = linkedSetOf<String>()
     private var groupsMenu: SubMenu? = null
@@ -117,7 +118,8 @@ class RssFragment : VMBaseFragment<RssSourceViewModel>(R.layout.fragment_rss),
     }
 
     private fun initGroupData() {
-        launch {
+        groupsFlowJob?.cancel()
+        groupsFlowJob = launch {
             appDb.rssSourceDao.flowGroup().collect {
                 groups.clear()
                 it.map { group ->