当epub的父目录与子目录的href相同时（第一卷与第一章href相同），这样的父目录与子目录打开时有bug，会出现文本后又消失，无法翻页到下一章，等一就会把所有子章节都加载了，手动跳转到第二章后才能正常翻页，建议使用获取线性目录的方法。

app/src/main/java/io/legado/app/model/localBook/EpubFile.kt

@@ -7,12 +7,10 @@ import android.text.TextUtils
 import io.legado.app.data.appDb
 import io.legado.app.data.entities.Book
 import io.legado.app.data.entities.BookChapter
-import io.legado.app.data.entities.EpubChapter
 import io.legado.app.utils.*
 import me.ag2s.epublib.domain.EpubBook
 import me.ag2s.epublib.domain.MediaTypes
 import me.ag2s.epublib.domain.Resources
-import me.ag2s.epublib.domain.TOCReference
 import me.ag2s.epublib.epub.EpubReader
 import me.ag2s.epublib.util.ResourceUtil
 import org.jsoup.Jsoup
@@ -212,15 +210,7 @@ class EpubFile(var book: Book) {
 
     private fun getChapterList(): ArrayList<BookChapter> {
         val chapterList = ArrayList<BookChapter>()
-        epubBook?.let { eBook ->
-            val refs = eBook.tableOfContents.tocReferences
-            if (refs == null || refs.isEmpty()) {
-                val spineReferences = eBook.spine.spineReferences
-                var i = 0
-                val size = spineReferences.size
-                while (i < size) {
-                    val resource =
-                        spineReferences[i].resource
+        epubBook?.tableOfContents?.allUniqueResources?.forEachIndexed { index, resource ->
             var title = resource.title
             if (TextUtils.isEmpty(title)) {
                 try {
@@ -235,133 +225,19 @@ class EpubFile(var book: Book) {
                 }
             }
             val chapter = BookChapter()
-                    chapter.index = i
+            chapter.index = index
             chapter.bookUrl = book.bookUrl
             chapter.url = resource.href
-                    if (i == 0 && title.isEmpty()) {
+            if (index == 0 && title.isEmpty()) {
                 chapter.title = "封面"
             } else {
                 chapter.title = title
             }
             chapterList.add(chapter)
-                    i++
-                }
-            } else {
-                parseFirstPage(chapterList, refs)
-                parseMenu(chapterList, refs, 0)
-                for (i in chapterList.indices) {
-                    chapterList[i].index = i
-                }
-                getChildChapter(chapterList)
-            }
         }
         book.latestChapterTitle = chapterList.lastOrNull()?.title
         book.totalChapterNum = chapterList.size
         return chapterList
     }
 
-    /*获取当前章节的子章节。部分书籍一个章节包含多个html文件，（一些精排书籍，每一章节正文前的标题、标题封面、引言等都会有独立html）*/
-    /*需在读取常规章节列表后调用，遍历书籍全内容，根据href检索原不包含在章节内的html归属父章节*/
-    private fun getChildChapter(chapterList: ArrayList<BookChapter>) {
-        epubBook?.let {
-            val contents = it.contents
-            val chapters = ArrayList<EpubChapter>()
-            if (contents != null) {
-                var i = 0
-                var j = 0
-                var parentHref: String? = null
-                while (i < contents.size) {
-                    val content = contents[i]
-                    if (j < chapterList.size && content.href == chapterList[j].url) {
-                        parentHref = content.href
-                        j++
-                    } else if (!parentHref.isNullOrBlank() && content.mediaType.toString()
-                            .contains("htm")
-                    ) {
-                        val epubChapter = EpubChapter()
-                        epubChapter.bookUrl = book.bookUrl
-                        epubChapter.href = content.href
-                        epubChapter.parentHref = parentHref
-                        chapters.add(epubChapter)
-                    }
-                    i++
-                }
-            }
-            appDb.epubChapterDao.deleteByName(book.bookUrl)
-            if (chapters.size > 0) appDb.epubChapterDao.insert(*chapters.toTypedArray())
-        }
-    }
-
-    /*获取书籍起始页内容。部分书籍第一章之前存在封面，引言，扉页等内容*/
-    /*tile获取不同书籍风格杂乱，格式化处理待优化*/
-    private var durIndex = 0
-    private fun parseFirstPage(
-        chapterList: ArrayList<BookChapter>,
-        refs: List<TOCReference>?
-    ) {
-        val contents = epubBook?.contents
-        if (epubBook == null || contents == null || refs == null) return
-        var i = 0
-        durIndex = 0
-        while (i < contents.size) {
-            val content = contents[i]
-            if (!content.mediaType.toString().contains("htm")) continue
-            /*检索到第一章href停止*/
-            if (refs[0].completeHref == content.href) break
-            val chapter = BookChapter()
-            var title = content.title
-            if (TextUtils.isEmpty(title)) {
-                val elements = Jsoup.parse(
-                    String(
-                        epubBook!!.resources.getByHref(content.href).data,
-                        mCharset
-                    )
-                ).getElementsByTag("title")
-                title =
-                    if (elements != null && elements.size > 0 && elements[0].text()
-                            .isNotBlank()
-                    ) elements[0].text() else "--卷首--"
-            }
-            chapter.bookUrl = book.bookUrl
-            chapter.title = title
-            chapter.url = content.href
-            chapter.startFragmentId =
-                if (content.href.substringAfter("#") == content.href) null
-                else content.href.substringAfter("#")
-            if (durIndex > 0) {
-                val preIndex = durIndex - 1
-                chapterList[preIndex].endFragmentId = chapter.startFragmentId
-            }
-            chapterList.add(chapter)
-            durIndex++
-            i++
-        }
-    }
-
-    private fun parseMenu(
-        chapterList: ArrayList<BookChapter>,
-        refs: List<TOCReference>?,
-        level: Int
-    ) {
-        refs?.forEach { ref ->
-            if (ref.resource != null) {
-                val chapter = BookChapter()
-                chapter.bookUrl = book.bookUrl
-                chapter.title = ref.title
-                chapter.url = ref.completeHref
-                chapter.startFragmentId = ref.fragmentId
-                if (durIndex > 0) {
-                    val preIndex = durIndex - 1
-                    chapterList[preIndex].endFragmentId = chapter.startFragmentId
-                }
-                chapterList.add(chapter)
-                durIndex++
-            }
-            if (ref.children != null && ref.children.isNotEmpty()) {
-                parseMenu(chapterList, ref.children, level + 1)
-            }
-        }
-    }
-
-
 }