优化

app/src/main/java/io/legado/app/service/help/ReadBook.kt

@@ -39,14 +39,16 @@ object ReadBook {
         durChapterIndex = book.durChapterIndex
         durPageIndex = book.durChapterPos
         isLocalBook = book.origin == BookType.local
-        webBook = null
-        App.db.bookSourceDao().getBookSource(book.origin)?.let {
-            webBook = WebBook(it)
-        }
         chapterSize = 0
         prevTextChapter = null
         curTextChapter = null
         nextTextChapter = null
+        upWebBook(book.origin)
+    }
+
+    fun upWebBook(origin: String) {
+        val bookSource = App.db.bookSourceDao().getBookSource(origin)
+        webBook = if (bookSource != null) WebBook(bookSource) else null
     }
 
     fun moveToNextPage() {

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

@@ -60,6 +60,7 @@ class ReadBookViewModel(application: Application) : BaseViewModel(application) {
         } else {
             isInitFinish = true
             ReadBook.titleDate.postValue(book.name)
+            ReadBook.upWebBook(book.origin)
             ReadBook.chapterSize = App.db.bookChapterDao().getChapterCount(book.bookUrl)
             if (ReadBook.chapterSize == 0) {
                 if (book.tocUrl.isEmpty()) {