优化

app/src/main/java/io/legado/app/data/entities/Book.kt

@@ -10,6 +10,7 @@ import io.legado.app.utils.GSON
 import io.legado.app.utils.fromJsonObject
 import kotlinx.android.parcel.IgnoredOnParcel
 import kotlinx.android.parcel.Parcelize
+import java.nio.charset.Charset
 import kotlin.math.max
 
 @Parcelize
@@ -81,6 +82,10 @@ data class Book(
         variable = GSON.toJson(variableMap)
     }
 
+    fun getCharset(): Charset {
+        return charset(charset ?: "UTF-8")
+    }
+
     fun toSearchBook(): SearchBook {
         return SearchBook(
             name = name,

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

@@ -7,6 +7,7 @@ import io.legado.app.constant.PreferKey
 import io.legado.app.data.entities.Book
 import io.legado.app.data.entities.BookChapter
 import io.legado.app.data.entities.ReplaceRule
+import io.legado.app.model.localBook.AnalyzeTxtFile
 import io.legado.app.utils.*
 import org.apache.commons.text.similarity.JaccardSimilarity
 import java.io.File
@@ -126,7 +127,9 @@ object BookHelp {
     }
 
     fun getContent(book: Book, bookChapter: BookChapter): String? {
-        if (downloadUri.isDocumentUri(App.INSTANCE)) {
+        if (book.isLocalBook()) {
+            AnalyzeTxtFile.getContent(book, bookChapter)
+        } else if (downloadUri.isDocumentUri(App.INSTANCE)) {
             DocumentFile.fromTreeUri(App.INSTANCE, downloadUri)?.let { root ->
                 return DocumentUtils.getDirDocument(
                     root,

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

@@ -28,14 +28,7 @@ object AnalyzeTxtFile {
     }
 
     fun analyze(context: Context, book: Book): ArrayList<BookChapter> {
-        val uri = Uri.parse(book.bookUrl)
-        val bookFile = FileUtils.getFile(cacheFolder, book.originName, subDirs = *arrayOf())
-        if (!bookFile.exists()) {
-            bookFile.createNewFile()
-            DocumentUtils.readBytes(context, uri)?.let {
-                bookFile.writeBytes(it)
-            }
-        }
+        val bookFile = getBookFile(context, book)
         val charset = charset(EncodingDetect.getEncode(bookFile))
         book.charset = charset.name()
         val toc = arrayListOf<BookChapter>()
@@ -189,6 +182,28 @@ object AnalyzeTxtFile {
         return toc
     }
 
+    fun getContent(book: Book, bookChapter: BookChapter): String {
+        val bookFile = getBookFile(App.INSTANCE, book)
+        //获取文件流
+        val bookStream = RandomAccessFile(bookFile, "r")
+        bookStream.seek(bookChapter.start ?: 0)
+        val extent = (bookChapter.end!! - bookChapter.start!!).toInt()
+        val content = ByteArray(extent)
+        bookStream.read(content, 0, extent)
+        return String(content, book.getCharset())
+    }
+
+    private fun getBookFile(context: Context, book: Book): File {
+        val uri = Uri.parse(book.bookUrl)
+        val bookFile = FileUtils.getFile(cacheFolder, book.originName, subDirs = *arrayOf())
+        if (!bookFile.exists()) {
+            bookFile.createNewFile()
+            DocumentUtils.readBytes(context, uri)?.let {
+                bookFile.writeBytes(it)
+            }
+        }
+        return bookFile
+    }
 
     private fun getTocRule(bookStream: RandomAccessFile, charset: Charset): Pattern? {
         val tocRules = getTocRules()

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

@@ -197,6 +197,7 @@ object ReadBook {
 
     private fun download(index: Int) {
         book?.let { book ->
+            if (book.isLocalBook()) return
             if (addLoading(index)) {
                 Coroutine.async {
                     App.db.bookChapterDao().getChapter(book.bookUrl, index)?.let { chapter ->

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

@@ -10,6 +10,7 @@ import io.legado.app.data.entities.BookChapter
 import io.legado.app.help.BookHelp
 import io.legado.app.help.IntentDataHelp
 import io.legado.app.model.WebBook
+import io.legado.app.model.localBook.AnalyzeTxtFile
 import io.legado.app.service.BaseReadAloudService
 import io.legado.app.service.help.ReadAloud
 import io.legado.app.service.help.ReadBook
@@ -79,18 +80,29 @@ class ReadBookViewModel(application: Application) : BaseViewModel(application) {
         changeDruChapterIndex: ((chapters: List<BookChapter>) -> Unit)? = null
     ) {
         execute {
+            if (book.isLocalBook()) {
+                loadChapterList(book, changeDruChapterIndex)
+            } else {
                 ReadBook.webBook?.getBookInfo(book, this)
                     ?.onSuccess {
                         loadChapterList(book, changeDruChapterIndex)
                     }
             }
         }
+    }
 
     private fun loadChapterList(
         book: Book,
         changeDruChapterIndex: ((chapters: List<BookChapter>) -> Unit)? = null
     ) {
         execute {
+            if (book.isLocalBook()) {
+                AnalyzeTxtFile.analyze(context, book).let {
+                    App.db.bookChapterDao().insert(*it.toTypedArray())
+                    ReadBook.chapterSize = it.size
+                    ReadBook.loadContent()
+                }
+            } else {
                 ReadBook.webBook?.getChapterList(book, this)
                     ?.onSuccess(IO) { cList ->
                         if (!cList.isNullOrEmpty()) {
@@ -109,6 +121,7 @@ class ReadBookViewModel(application: Application) : BaseViewModel(application) {
                     } ?: autoChangeSource()
             }
         }
+    }
 
     fun changeTo(book1: Book) {
         execute {