优化

app/src/main/java/io/legado/app/data/entities/Book.kt

@@ -8,6 +8,7 @@ import androidx.room.PrimaryKey
 import io.legado.app.App
 import io.legado.app.constant.AppPattern
 import io.legado.app.constant.BookType
+import io.legado.app.service.help.ReadBook
 import io.legado.app.utils.GSON
 import io.legado.app.utils.fromJsonObject
 import kotlinx.android.parcel.IgnoredOnParcel
@@ -142,7 +143,14 @@ data class Book(
         newBook.customIntro = customIntro
         newBook.customTag = customTag
         newBook.canUpdate = canUpdate
-        App.db.bookDao().delete(this)
+        delete()
         App.db.bookDao().insert(newBook)
     }
+
+    fun delete() {
+        if (ReadBook.book?.bookUrl == bookUrl) {
+            ReadBook.book = null
+        }
+        App.db.bookDao().delete(this)
+    }
 }

app/src/main/java/io/legado/app/ui/book/info/BookInfoViewModel.kt

@@ -216,7 +216,7 @@ class BookInfoViewModel(application: Application) : BaseViewModel(application) {
     fun delBook(deleteOriginal: Boolean = false, success: (() -> Unit)? = null) {
         execute {
             bookData.value?.let {
-                App.db.bookDao().delete(it)
+                it.delete()
                 inBookshelf = false
                 if (it.isLocalBook()) {
                     LocalBook.deleteBook(it, deleteOriginal)

app/src/main/java/io/legado/app/ui/book/read/ReadBookViewModel.kt

@@ -222,9 +222,7 @@ class ReadBookViewModel(application: Application) : BaseViewModel(application) {
 
     fun removeFromBookshelf(success: (() -> Unit)?) {
         execute {
-            ReadBook.book?.let {
-                App.db.bookDao().delete(it)
-            }
+            ReadBook.book?.delete()
         }.onSuccess {
             success?.invoke()
         }