优化

app/src/main/java/io/legado/app/help/BookHelp.kt

@@ -133,9 +133,11 @@ object BookHelp {
     }
 
     fun getContent(book: Book, bookChapter: BookChapter): String? {
-        if (book.isLocalBook()) {
+        when {
+            book.isLocalBook() -> {
                 return AnalyzeTxtFile.getContent(book, bookChapter)
-        } else if (downloadUri.isDocumentUri(App.INSTANCE)) {
+            }
+            downloadUri.isDocumentUri(App.INSTANCE) -> {
                 DocumentFile.fromTreeUri(App.INSTANCE, downloadUri)?.let { root ->
                     return DocumentUtils.getDirDocument(
                         root,
@@ -143,7 +145,8 @@ object BookHelp {
                     )?.findFile("${bookChapterName(bookChapter)}.nb")
                         ?.uri?.readText(App.INSTANCE)
                 }
-        } else {
+            }
+            else -> {
                 val file = FileUtils.getFile(
                     File(downloadPath),
                     "${bookChapterName(bookChapter)}.nb",
@@ -153,11 +156,14 @@ object BookHelp {
                     return file.readText()
                 }
             }
+        }
         return null
     }
 
     fun delContent(book: Book, bookChapter: BookChapter) {
-        if (downloadUri.isDocumentUri(App.INSTANCE)) {
+        when {
+            book.isLocalBook() -> return
+            downloadUri.isDocumentUri(App.INSTANCE) -> {
                 DocumentFile.fromTreeUri(App.INSTANCE, downloadUri)?.let { root ->
                     DocumentUtils.getDirDocument(
                         root,
@@ -165,7 +171,8 @@ object BookHelp {
                     )?.findFile("${bookChapterName(bookChapter)}.nb")
                         ?.delete()
                 }
-        } else {
+            }
+            else -> {
                 FileUtils.createFileIfNotExist(
                     File(downloadPath),
                     "${bookChapterName(bookChapter)}.nb",
@@ -173,6 +180,7 @@ object BookHelp {
                 ).delete()
             }
         }
+    }
 
     private fun formatFolderName(folderName: String): String {
         return folderName.replace("[\\\\/:*?\"<>|.]".toRegex(), "")