Fix page animation switch

app/src/main/java/io/legado/app/model/ReadBook.kt

@@ -170,12 +170,12 @@ object ReadBook : CoroutineScope by MainScope() {
             appDb.bookSourceDao.getBookSource(book.origin)?.let {
                 bookSource = it
                 if (book.getImageStyle().isNullOrBlank()) {
-                    book.setImageStyle(it.getContentRule().imageStyle)
+                    val imageStyle = it.getContentRule().imageStyle
-                }
+                    book.setImageStyle(imageStyle)
-                if (it.getContentRule().imageStyle == Book.imgStyleSingle) {
+                    if (imageStyle.equals(Book.imgStyleSingle, true)) {
-                    book.setImageStyle(it.getContentRule().imageStyle)
                         book.setPageAnim(0)
                     }
+                }
             } ?: let {
                 bookSource = null
             }

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

@@ -565,14 +565,20 @@ class ReadBookActivity : BaseReadBookActivity(),
             R.id.menu_set_charset -> showCharsetConfig()
             R.id.menu_image_style -> {
                 val imgStyles =
-                    arrayListOf(Book.imgStyleDefault, Book.imgStyleFull, Book.imgStyleText, Book.imgStyleSingle)
+                    arrayListOf(
+                        Book.imgStyleDefault, Book.imgStyleFull, Book.imgStyleText,
+                        Book.imgStyleSingle
+                    )
                 selector(
                     R.string.image_style,
                     imgStyles
                 ) { _, index ->
-                    ReadBook.book?.setImageStyle(imgStyles[index])
+                    val imageStyle = imgStyles[index]
+                    ReadBook.book?.setImageStyle(imageStyle)
+                    if (imageStyle == Book.imgStyleSingle) {
                         ReadBook.book?.setPageAnim(0)  // 切换图片样式single后，自动切换为覆盖
                         binding.readView.upPageAnim()
+                    }
                     ReadBook.loadContent(false)
                 }
             }

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

@@ -134,7 +134,7 @@ class ReadStyleDialog : BaseDialogFragment(R.layout.dialog_read_book_style),
             TipConfigDialog().show(childFragmentManager, "tipConfigDialog")
         }
         rgPageAnim.setOnCheckedChangeListener { _, checkedId ->
-            ReadBook.book?.setPageAnim(null)
+            ReadBook.book?.setPageAnim(-1)
             ReadBookConfig.pageAnim = binding.rgPageAnim.getIndexById(checkedId)
             callBack?.upPageAnim()
             ReadBook.loadContent(false)