up

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

@@ -47,4 +47,7 @@ interface BookDao {
 
     @Update
     fun update(vararg books: Book)
+
+    @Query("delete from books where bookUrl = :bookUrl")
+    fun delete(bookUrl: String)
 }

app/src/main/java/io/legado/app/ui/bookinfo/BookInfoActivity.kt

@@ -190,12 +190,7 @@ class BookInfoActivity : VMBaseActivity<BookInfoViewModel>(R.layout.activity_boo
     }
 
     override fun changeTo(book: Book) {
-        viewModel.bookData.postValue(book)
-        if (book.tocUrl.isEmpty()) {
-            viewModel.loadBookInfo(book)
-        } else {
-            viewModel.loadChapter(book)
-        }
+        viewModel.changeTo(book)
     }
 
     override fun skipToChapter(index: Int) {

app/src/main/java/io/legado/app/ui/bookinfo/BookInfoViewModel.kt

@@ -81,6 +81,23 @@ class BookInfoViewModel(application: Application) : BaseViewModel(application) {
         }
     }
 
+    fun changeTo(book: Book) {
+        execute {
+            if (inBookshelf) {
+                bookData.value?.let {
+                    App.db.bookDao().delete(it.bookUrl)
+                }
+                App.db.bookDao().insert(book)
+            }
+            bookData.postValue(book)
+            if (book.tocUrl.isEmpty()) {
+                loadBookInfo(book)
+            } else {
+                loadChapter(book)
+            }
+        }
+    }
+
     fun saveBook(success: (() -> Unit)?) {
         execute {
             bookData.value?.let { book ->