up

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

@@ -189,6 +189,10 @@ class BookInfoActivity : VMBaseActivity<BookInfoViewModel>(R.layout.activity_boo
         }
     }
 
+    override fun oldBook(): Book? {
+        return viewModel.bookData.value
+    }
+
     override fun changeTo(book: Book) {
         viewModel.changeTo(book)
     }

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

@@ -82,12 +82,6 @@ class BookInfoViewModel(application: Application) : BaseViewModel(application) {
     }
 
     fun changeTo(book: Book) {
-        bookData.value?.let {
-            book.durChapterIndex = it.durChapterIndex
-            book.durChapterPos = it.durChapterPos
-            book.customCoverUrl = it.customCoverUrl
-            book.customIntro = it.customIntro
-        }
         execute {
             if (inBookshelf) {
                 bookData.value?.let {

app/src/main/java/io/legado/app/ui/changesource/ChangeSourceDialog.kt

@@ -109,7 +109,16 @@ class ChangeSourceDialog : DialogFragment(),
     }
 
     override fun changeTo(searchBook: SearchBook) {
-        callBack?.changeTo(searchBook.toBook())
+        callBack?.let {
+            val book = searchBook.toBook()
+            it.oldBook()?.let { oldBook ->
+                book.durChapterIndex = oldBook.durChapterIndex
+                book.durChapterPos = oldBook.durChapterPos
+                book.customCoverUrl = oldBook.customCoverUrl
+                book.customIntro = oldBook.customIntro
+            }
+            it.changeTo(book)
+        }
         dismiss()
     }
 
@@ -122,6 +131,7 @@ class ChangeSourceDialog : DialogFragment(),
     }
 
     interface CallBack {
+        fun oldBook(): Book?
         fun changeTo(book: Book)
     }
 

app/src/main/java/io/legado/app/ui/readbook/ReadBookActivity.kt

@@ -267,6 +267,10 @@ class ReadBookActivity : VMBaseActivity<ReadBookViewModel>(R.layout.activity_rea
         }
     }
 
+    override fun oldBook(): Book? {
+        return viewModel.bookData.value
+    }
+
     override fun changeTo(book: Book) {
 
     }