优化

app/src/main/java/io/legado/app/data/dao/BookDao.kt

@@ -1,6 +1,7 @@
 package io.legado.app.data.dao
 
 import androidx.room.*
+import io.legado.app.constant.AppConst
 import io.legado.app.constant.BookType
 import io.legado.app.data.entities.Book
 import kotlinx.coroutines.flow.Flow
@@ -8,6 +9,16 @@ import kotlinx.coroutines.flow.Flow
 @Dao
 interface BookDao {
 
+    @Query(
+        """
+        select * from books where type != ${BookType.audio} 
+        and origin != '${BookType.local}' 
+        and ((SELECT sum(groupId) FROM book_groups where groupId > 0) & `group`) = 0
+        and (select show from book_groups where groupId = ${AppConst.bookGroupNoneId}) != 1
+        """
+    )
+    fun flowRoot(): Flow<List<Book>>
+
     @Query("SELECT * FROM books order by durChapterTime desc")
     fun flowAll(): Flow<List<Book>>
 
@@ -17,7 +28,13 @@ interface BookDao {
     @Query("SELECT * FROM books WHERE origin = '${BookType.local}'")
     fun flowLocal(): Flow<List<Book>>
 
-    @Query("select * from books where type != ${BookType.audio} and origin != '${BookType.local}' and ((SELECT sum(groupId) FROM book_groups where groupId > 0) & `group`) = 0")
+    @Query(
+        """
+        select * from books where type != ${BookType.audio} 
+        and origin != '${BookType.local}' 
+        and ((SELECT sum(groupId) FROM book_groups where groupId > 0) & `group`) = 0
+        """
+    )
     fun flowNoGroup(): Flow<List<Book>>
 
     @Query("SELECT bookUrl FROM books WHERE origin = '${BookType.local}'")

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

@@ -73,6 +73,14 @@ abstract class BaseBooksAdapter<VH : RecyclerView.ViewHolder>(
         }
     }
 
+    override fun getItemCount(): Int {
+        return callBack.getItemCount()
+    }
+
+    override fun getItemViewType(position: Int): Int {
+        return callBack.getItemType(position)
+    }
+
 
     interface CallBack {
         fun onItemClick(position: Int)
@@ -80,6 +88,6 @@ abstract class BaseBooksAdapter<VH : RecyclerView.ViewHolder>(
         fun isUpdate(bookUrl: String): Boolean
         fun getItemCount(): Int
         fun getItemType(position: Int): Int
-        fun getItem(position: Int): Any
+        fun getItem(position: Int): Any?
     }
 }

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

@@ -17,14 +17,6 @@ import splitties.views.onLongClick
 class BooksAdapterGrid(context: Context, callBack: CallBack) :
     BaseBooksAdapter<RecyclerView.ViewHolder>(context, callBack) {
 
-    override fun getItemCount(): Int {
-        return callBack.getItemCount()
-    }
-
-    override fun getItemViewType(position: Int): Int {
-        return callBack.getItemType(position)
-    }
-
     override fun onCreateViewHolder(
         parent: ViewGroup,
         viewType: Int
@@ -67,7 +59,7 @@ class BooksAdapterGrid(context: Context, callBack: CallBack) :
 
     private fun onBindBook(binding: ItemBookshelfGridBinding, position: Int, bundle: Bundle) {
         binding.run {
-            val item = callBack.getItem(position) as Book
+            val item = callBack.getItem(position) as? Book ?: return
             bundle.keySet().forEach {
                 when (it) {
                     "name" -> tvName.text = item.name

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

@@ -19,14 +19,6 @@ import splitties.views.onLongClick
 class BooksAdapterList(context: Context, callBack: CallBack) :
     BaseBooksAdapter<RecyclerView.ViewHolder>(context, callBack) {
 
-    override fun getItemCount(): Int {
-        return callBack.getItemCount()
-    }
-
-    override fun getItemViewType(position: Int): Int {
-        return callBack.getItemType(position)
-    }
-
     override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
         return when (viewType) {
             1 -> GroupViewHolder(
@@ -65,7 +57,7 @@ class BooksAdapterList(context: Context, callBack: CallBack) :
 
     private fun onBindBook(binding: ItemBookshelfListBinding, position: Int, bundle: Bundle) {
         binding.run {
-            val item = callBack.getItem(position) as Book
+            val item = callBack.getItem(position) as? Book ?: return
             tvRead.text = item.durChapterTitle
             tvLast.text = item.latestChapterTitle
             bundle.keySet().forEach {

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

@@ -43,6 +43,7 @@ class BookshelfFragment2 : BaseBookshelfFragment(R.layout.fragment_bookshelf1),
     BaseBooksAdapter.CallBack {
 
     private val binding by viewBinding(FragmentBookshelf1Binding::bind)
+    private val rootGroupId = -100L
     private val bookshelfLayout by lazy {
         getPrefInt(PreferKey.bookshelfLayout)
     }
@@ -55,7 +56,7 @@ class BookshelfFragment2 : BaseBookshelfFragment(R.layout.fragment_bookshelf1),
     }
     private var bookGroups: List<BookGroup> = emptyList()
     private var booksFlowJob: Job? = null
-    override var groupId = AppConst.bookGroupNoneId
+    override var groupId = rootGroupId
     override var books: List<Book> = emptyList()
 
     override fun onFragmentCreated(view: View, savedInstanceState: Bundle?) {
@@ -108,7 +109,7 @@ class BookshelfFragment2 : BaseBookshelfFragment(R.layout.fragment_bookshelf1),
 
     @SuppressLint("NotifyDataSetChanged")
     private fun initBooksData() {
-        if (groupId == AppConst.bookGroupNoneId) {
+        if (groupId == -100L) {
             binding.titleBar.title = getString(R.string.bookshelf)
         } else {
             bookGroups.forEach {
@@ -120,6 +121,7 @@ class BookshelfFragment2 : BaseBookshelfFragment(R.layout.fragment_bookshelf1),
         booksFlowJob?.cancel()
         booksFlowJob = launch {
             when (groupId) {
+                rootGroupId -> appDb.bookDao.flowRoot()
                 AppConst.bookGroupAllId -> appDb.bookDao.flowAll()
                 AppConst.bookGroupLocalId -> appDb.bookDao.flowLocal()
                 AppConst.bookGroupAudioId -> appDb.bookDao.flowAudio()
@@ -152,8 +154,8 @@ class BookshelfFragment2 : BaseBookshelfFragment(R.layout.fragment_bookshelf1),
     }
 
     fun back(): Boolean {
-        if (groupId != AppConst.bookGroupNoneId) {
+        if (groupId != -100L) {
-            groupId = AppConst.bookGroupNoneId
+            groupId = -100L
             initBooksData()
             return true
         }
@@ -210,7 +212,7 @@ class BookshelfFragment2 : BaseBookshelfFragment(R.layout.fragment_bookshelf1),
     }
 
     override fun getItemCount(): Int {
-        return if (groupId == AppConst.bookGroupNoneId) {
+        return if (groupId == rootGroupId) {
             bookGroups.size + books.size
         } else {
             books.size
@@ -218,23 +220,23 @@ class BookshelfFragment2 : BaseBookshelfFragment(R.layout.fragment_bookshelf1),
     }
 
     override fun getItemType(position: Int): Int {
-        return if (groupId == AppConst.bookGroupNoneId) {
+        if (groupId != rootGroupId) {
-            if (position < bookGroups.size) 1 else 0
+            return 0
-        } else {
+        }
-            0
+        if (position < bookGroups.size) {
+            return 1
         }
+        return 0
     }
 
-    override fun getItem(position: Int): Any {
+    override fun getItem(position: Int): Any? {
-        return if (groupId == AppConst.bookGroupNoneId) {
+        if (groupId != rootGroupId) {
-            if (position < bookGroups.size) {
+            return books.getOrNull(position)
-                bookGroups[position]
+        }
-            } else {
+        if (position < bookGroups.size) {
-                books[position - bookGroups.size]
+            return bookGroups[position]
-            }
-        } else {
-            books[position]
         }
+        return books.getOrNull(position - bookGroups.size)
     }
 
     @SuppressLint("NotifyDataSetChanged")