优化

app/src/main/java/io/legado/app/ui/book/manage/BookAdapter.kt

@@ -23,6 +23,13 @@ class BookAdapter(context: Context, val callBack: CallBack) :
     private val selectedBooks: HashSet<Book> = hashSetOf()
     var actionItem: Book? = null
 
+    val selection: List<Book>
+        get() {
+            return getItems().filter {
+                selectedBooks.contains(it)
+            }
+        }
+
     override fun getViewBinding(parent: ViewGroup): ItemArrangeBookBinding {
         return ItemArrangeBookBinding.inflate(inflater, parent, false)
     }
@@ -114,16 +121,6 @@ class BookAdapter(context: Context, val callBack: CallBack) :
         callBack.upSelectCount()
     }
 
-    fun selectedBooks(): Array<Book> {
-        val books = arrayListOf<Book>()
-        selectedBooks.forEach {
-            if (getItems().contains(it)) {
-                books.add(it)
-            }
-        }
-        return books.toTypedArray()
-    }
-
     private fun getGroupList(groupId: Long): List<String> {
         val groupNames = arrayListOf<String>()
         callBack.groupList.forEach {

app/src/main/java/io/legado/app/ui/book/manage/BookshelfManageActivity.kt

@@ -183,13 +183,13 @@ class BookshelfManageActivity :
         when (item?.itemId) {
             R.id.menu_del_selection ->
                 alert(titleResource = R.string.draw, messageResource = R.string.sure_del) {
-                    okButton { viewModel.deleteBook(*adapter.selectedBooks()) }
+                    okButton { viewModel.deleteBook(*adapter.selection.toTypedArray()) }
                     noButton()
                 }
             R.id.menu_update_enable ->
-                viewModel.upCanUpdate(adapter.selectedBooks(), true)
+                viewModel.upCanUpdate(adapter.selection, true)
             R.id.menu_update_disable ->
-                viewModel.upCanUpdate(adapter.selectedBooks(), false)
+                viewModel.upCanUpdate(adapter.selection, false)
             R.id.menu_add_to_group -> selectGroup(addToGroupRequestCode, 0)
             R.id.menu_change_source -> showDialogFragment<SourcePickerDialog>()
         }
@@ -213,30 +213,29 @@ class BookshelfManageActivity :
 
     override fun upGroup(requestCode: Int, groupId: Long) {
         when (requestCode) {
-            groupRequestCode -> {
-                val books = arrayListOf<Book>()
-                adapter.selectedBooks().forEach {
-                    books.add(it.copy(group = groupId))
+            groupRequestCode -> adapter.selection.let { books ->
+                val array = Array(books.size) {
+                    books[it].copy(group = groupId)
                 }
-                viewModel.updateBook(*books.toTypedArray())
+                viewModel.updateBook(*array)
             }
             adapter.groupRequestCode -> {
                 adapter.actionItem?.let {
                     viewModel.updateBook(it.copy(group = groupId))
                 }
             }
-            addToGroupRequestCode -> {
-                val books = arrayListOf<Book>()
-                adapter.selectedBooks().forEach {
-                    books.add(it.copy(group = it.group or groupId))
+            addToGroupRequestCode -> adapter.selection.let { books ->
+                val array = Array(books.size) { index ->
+                    val book = books[index]
+                    book.copy(group = book.group or groupId)
                 }
-                viewModel.updateBook(*books.toTypedArray())
+                viewModel.updateBook(*array)
             }
         }
     }
 
     override fun upSelectCount() {
-        binding.selectActionBar.upCountView(adapter.selectedBooks().size, adapter.getItems().size)
+        binding.selectActionBar.upCountView(adapter.selection.size, adapter.getItems().size)
     }
 
     override fun updateBook(vararg book: Book) {
@@ -252,7 +251,7 @@ class BookshelfManageActivity :
     }
 
     override fun sourceOnClick(source: BookSource) {
-        viewModel.changeSource(adapter.selectedBooks(), source)
+        viewModel.changeSource(adapter.selection, source)
         viewModel.batchChangeSourceState.value = true
     }
 

app/src/main/java/io/legado/app/ui/book/manage/BookshelfManageViewModel.kt

@@ -18,12 +18,12 @@ class BookshelfManageViewModel(application: Application) : BaseViewModel(applica
     val batchChangeSourcePosition = mutableStateOf(0)
     var batchChangeSourceCoroutine: Coroutine<Unit>? = null
 
-    fun upCanUpdate(books: Array<Book>, canUpdate: Boolean) {
+    fun upCanUpdate(books: List<Book>, canUpdate: Boolean) {
         execute {
-            books.forEach {
-                it.canUpdate = canUpdate
+            val array = Array(books.size) {
+                books[it].copy(canUpdate = canUpdate)
             }
-            appDb.bookDao.update(*books)
+            appDb.bookDao.update(*array)
         }
     }
 
@@ -39,7 +39,7 @@ class BookshelfManageViewModel(application: Application) : BaseViewModel(applica
         }
     }
 
-    fun changeSource(books: Array<Book>, source: BookSource) {
+    fun changeSource(books: List<Book>, source: BookSource) {
         batchChangeSourceCoroutine?.cancel()
         batchChangeSourceCoroutine = execute {
             batchChangeSourceSize.value = books.size