优化

app/build.gradle

@@ -193,6 +193,9 @@ dependencies {
     implementation 'org.apache.commons:commons-lang3:3.11'
     implementation 'org.apache.commons:commons-text:1.8'
 
+    //字符串比较
+    implementation 'net.ricecode:string-similarity:1.0.0'
+
     //MarkDown
     implementation 'ru.noties.markwon:core:3.1.0'
 

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

@@ -15,10 +15,15 @@ import kotlinx.coroutines.Dispatchers.IO
 import kotlinx.coroutines.Dispatchers.Main
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.withContext
-import org.apache.commons.text.similarity.JaccardSimilarity
+import net.ricecode.similarity.JaroWinklerStrategy
+import net.ricecode.similarity.StringSimilarityServiceImpl
 import org.jetbrains.anko.toast
 import java.io.File
 import java.util.concurrent.CopyOnWriteArraySet
+import java.util.regex.Matcher
+import java.util.regex.Pattern
+import kotlin.math.abs
+import kotlin.math.max
 import kotlin.math.min
 
 object BookHelp {
@@ -202,54 +207,88 @@ object BookHelp {
     }
 
     /**
-     * 找到相似度最高的章节
+     * 根据目录名获取当前章节
      */
-    fun getDurChapterIndexByChapterTitle(
-        title: String?,
-        index: Int,
-        chapters: List<BookChapter>,
+    fun getDurChapter(
+        oldDurChapterIndex: Int,
+        oldChapterListSize: Int,
+        oldDurChapterName: String?,
+        newChapterList: List<BookChapter>
     ): Int {
-        if (title.isNullOrEmpty()) {
-            return min(index, chapters.lastIndex)
-        }
-        if (chapters.size > index && title == chapters[index].title) {
-            return index
-        }
-
+        if (oldChapterListSize == 0) return 0
+        val oldChapterNum = getChapterNum(oldDurChapterName)
+        val oldName = getPureChapterName(oldDurChapterName)
+        val newChapterSize = newChapterList.size
+        val min = max(
+            0,
+            min(
+                oldDurChapterIndex,
+                oldDurChapterIndex - oldChapterListSize + newChapterSize
+            ) - 10
+        )
+        val max = min(
+            newChapterSize - 1,
+            max(
+                oldDurChapterIndex,
+                oldDurChapterIndex - oldChapterListSize + newChapterSize
+            ) + 10
+        )
+        var nameSim = 0.0
         var newIndex = 0
-        val jSimilarity = JaccardSimilarity()
-        var similarity = if (chapters.size > index) {
-            jSimilarity.apply(title, chapters[index].title)
-        } else 0.0
-        if (similarity == 1.0) {
-            return index
-        } else {
-            for (i in 1..50) {
-                if (index - i in chapters.indices) {
-                    jSimilarity.apply(title, chapters[index - i].title).let {
-                        if (it > similarity) {
-                            similarity = it
-                            newIndex = index - i
-                            if (similarity == 1.0) {
-                                return newIndex
+        var newNum = 0
+        if (oldName.isNotEmpty()) {
+            val service = StringSimilarityServiceImpl(JaroWinklerStrategy())
+            for (i in min..max) {
+                val newName = getPureChapterName(newChapterList[i].title)
+                val temp = service.score(oldName, newName)
+                if (temp > nameSim) {
+                    nameSim = temp
+                    newIndex = i
                 }
             }
         }
+        if (nameSim < 0.96 && oldChapterNum > 0) {
+            for (i in min..max) {
+                val temp = getChapterNum(newChapterList[i].title)
+                if (temp == oldChapterNum) {
+                    newNum = temp
+                    newIndex = i
+                    break
+                } else if (abs(temp - oldChapterNum) < abs(newNum - oldChapterNum)) {
+                    newNum = temp
+                    newIndex = i
                 }
-                if (index + i in chapters.indices) {
-                    jSimilarity.apply(title, chapters[index + i].title).let {
-                        if (it > similarity) {
-                            similarity = it
-                            newIndex = index + i
-                            if (similarity == 1.0) {
-                                return newIndex
             }
         }
+        return if (nameSim > 0.96 || abs(newNum - oldChapterNum) < 1) {
+            newIndex
+        } else {
+            min(max(0, newChapterList.size - 1), oldDurChapterIndex)
         }
     }
+
+    private val chapterNamePattern =
+        Pattern.compile("^(.*?第([\\d零〇一二两三四五六七八九十百千万壹贰叁肆伍陆柒捌玖拾佰仟０-９\\s]+)[章节篇回集])[、，。　：:.\\s]*")
+
+    private fun getChapterNum(chapterName: String?): Int {
+        if (chapterName != null) {
+            val matcher: Matcher = chapterNamePattern.matcher(chapterName)
+            if (matcher.find()) {
+                return StringUtils.stringToInt(matcher.group(2))
             }
         }
-        return newIndex
+        return -1
+    }
+
+    private fun getPureChapterName(chapterName: String?): String {
+        // 所有非字母数字中日韩文字 CJK区+扩展A-F区
+        return if (chapterName == null) "" else StringUtils.fullToHalf(chapterName)
+            .replace("\\s".toRegex(), "")
+            .replace("^第.*?章|[(\\[][^()\\[\\]]{2,}[)\\]]$".toRegex(), "")
+            .replace(
+                "[^\\w\\u4E00-\\u9FEF〇\\u3400-\\u4DBF\\u20000-\\u2A6DF\\u2A700-\\u2EBEF]".toRegex(),
+                ""
+            )
     }
 
     private var bookName: String? = null

app/src/main/java/io/legado/app/ui/audio/AudioPlayViewModel.kt

@@ -89,7 +89,9 @@ class AudioPlayViewModel(application: Application) : BaseViewModel(application)
 
     fun changeTo(book1: Book) {
         execute {
+            var oldTocSize: Int = book1.totalChapterNum
             AudioPlay.book?.let {
+                oldTocSize = it.totalChapterNum
                 book1.order = it.order
                 App.db.bookDao().delete(it)
             }
@@ -99,18 +101,23 @@ class AudioPlayViewModel(application: Application) : BaseViewModel(application)
                 AudioPlay.webBook = WebBook(it)
             }
             if (book1.tocUrl.isEmpty()) {
-                loadBookInfo(book1) { upChangeDurChapterIndex(book1, it) }
+                loadBookInfo(book1) { upChangeDurChapterIndex(book1, oldTocSize, it) }
             } else {
-                loadChapterList(book1) { upChangeDurChapterIndex(book1, it) }
+                loadChapterList(book1) { upChangeDurChapterIndex(book1, oldTocSize, it) }
             }
         }
     }
 
-    private fun upChangeDurChapterIndex(book: Book, chapters: List<BookChapter>) {
+    private fun upChangeDurChapterIndex(
+        book: Book,
+        oldTocSize: Int,
+        chapters: List<BookChapter>
+    ) {
         execute {
-            AudioPlay.durChapterIndex = BookHelp.getDurChapterIndexByChapterTitle(
-                book.durChapterTitle,
+            AudioPlay.durChapterIndex = BookHelp.getDurChapter(
                 book.durChapterIndex,
+                oldTocSize,
+                book.durChapterTitle,
                 chapters
             )
             book.durChapterIndex = AudioPlay.durChapterIndex

app/src/main/java/io/legado/app/ui/book/info/BookInfoViewModel.kt

@@ -133,23 +133,36 @@ class BookInfoViewModel(application: Application) : BaseViewModel(application) {
 
     fun changeTo(newBook: Book) {
         execute {
+            var oldTocSize: Int = newBook.totalChapterNum
             if (inBookshelf) {
-                bookData.value?.changeTo(newBook)
+                bookData.value?.let {
+                    oldTocSize = it.totalChapterNum
+                    it.changeTo(newBook)
+                }
             }
             bookData.postValue(newBook)
             if (newBook.tocUrl.isEmpty()) {
-                loadBookInfo(newBook, false) { upChangeDurChapterIndex(newBook, it) }
+                loadBookInfo(newBook, false) {
+                    upChangeDurChapterIndex(newBook, oldTocSize, it)
+                }
             } else {
-                loadChapter(newBook) { upChangeDurChapterIndex(newBook, it) }
+                loadChapter(newBook) {
+                    upChangeDurChapterIndex(newBook, oldTocSize, it)
+                }
             }
         }
     }
 
-    private fun upChangeDurChapterIndex(book: Book, chapters: List<BookChapter>) {
+    private fun upChangeDurChapterIndex(
+        book: Book,
+        oldTocSize: Int,
+        chapters: List<BookChapter>
+    ) {
         execute {
-            book.durChapterIndex = BookHelp.getDurChapterIndexByChapterTitle(
-                book.durChapterTitle,
+            book.durChapterIndex = BookHelp.getDurChapter(
                 book.durChapterIndex,
+                oldTocSize,
+                book.durChapterTitle,
                 chapters
             )
             book.durChapterTitle = chapters[book.durChapterIndex].title

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

@@ -157,8 +157,12 @@ class ReadBookViewModel(application: Application) : BaseViewModel(application) {
 
     fun changeTo(newBook: Book) {
         execute {
+            var oldTocSize: Int = newBook.totalChapterNum
             ReadBook.upMsg(null)
-            ReadBook.book?.changeTo(newBook)
+            ReadBook.book?.let {
+                oldTocSize = it.totalChapterNum
+                it.changeTo(newBook)
+            }
             ReadBook.book = newBook
             App.db.bookSourceDao().getBookSource(newBook.origin)?.let {
                 ReadBook.webBook = WebBook(it)
@@ -171,11 +175,11 @@ class ReadBookViewModel(application: Application) : BaseViewModel(application) {
             }
             if (newBook.tocUrl.isEmpty()) {
                 loadBookInfo(newBook) {
-                    upChangeDurChapterIndex(newBook, it)
+                    upChangeDurChapterIndex(newBook, oldTocSize, it)
                 }
             } else {
                 loadChapterList(newBook) {
-                    upChangeDurChapterIndex(newBook, it)
+                    upChangeDurChapterIndex(newBook, oldTocSize, it)
                 }
             }
         }
@@ -208,11 +212,12 @@ class ReadBookViewModel(application: Application) : BaseViewModel(application) {
         }
     }
 
-    private fun upChangeDurChapterIndex(book: Book, chapters: List<BookChapter>) {
+    private fun upChangeDurChapterIndex(book: Book, oldTocSize: Int, chapters: List<BookChapter>) {
         execute {
-            ReadBook.durChapterIndex = BookHelp.getDurChapterIndexByChapterTitle(
-                book.durChapterTitle,
+            ReadBook.durChapterIndex = BookHelp.getDurChapter(
                 book.durChapterIndex,
+                oldTocSize,
+                book.durChapterTitle,
                 chapters
             )
             book.durChapterIndex = ReadBook.durChapterIndex