优化

app/src/main/java/io/legado/app/help/coroutine/Coroutine.kt

@@ -1,6 +1,5 @@
 package io.legado.app.help.coroutine
 
-import io.legado.app.BuildConfig
 import kotlinx.coroutines.*
 import timber.log.Timber
 import kotlin.coroutines.CoroutineContext
@@ -138,21 +137,20 @@ class Coroutine<T>(
         return scope.plus(Dispatchers.Main).launch {
             try {
                 start?.let { dispatchVoidCallback(this, it) }
+                ensureActive()
                 val value = executeBlock(scope, context, timeMillis ?: 0L, block)
-                if (isActive) {
-                    success?.let { dispatchCallback(this, value, it) }
-                }
+                ensureActive()
+                success?.let { dispatchCallback(this, value, it) }
+            } catch (e: CancellationException) {
+                Timber.e("任务取消")
             } catch (e: Throwable) {
-                if (BuildConfig.DEBUG) {
-                    Timber.e(e)
-                }
+                Timber.e(e)
                 val consume: Boolean = errorReturn?.value?.let { value ->
                     if (isActive) {
                         success?.let { dispatchCallback(this, value, it) }
                     }
                     true
                 } ?: false
-
                 if (!consume && isActive) {
                     error?.let { dispatchCallback(this, e, it) }
                 }

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

@@ -13,6 +13,7 @@ import io.legado.app.data.entities.BookSource
 import io.legado.app.help.AppConfig
 import io.legado.app.help.BookHelp
 import io.legado.app.help.ContentProcessor
+import io.legado.app.help.coroutine.Coroutine
 import io.legado.app.help.storage.AppWebDav
 import io.legado.app.model.NoStackTraceException
 import io.legado.app.model.ReadAloud
@@ -25,10 +26,12 @@ import io.legado.app.utils.msg
 import io.legado.app.utils.postEvent
 import io.legado.app.utils.toastOnUi
 import kotlinx.coroutines.Dispatchers.IO
+import kotlinx.coroutines.ensureActive
 
 class ReadBookViewModel(application: Application) : BaseViewModel(application) {
     var isInitFinish = false
     var searchContentQuery = ""
+    var changeSourceCoroutine: Coroutine<*>? = null
 
     fun initData(intent: Intent) {
         execute {
@@ -165,12 +168,15 @@ class ReadBookViewModel(application: Application) : BaseViewModel(application) {
     }
 
     fun changeTo(source: BookSource, book: Book) {
-        execute {
+        changeSourceCoroutine?.cancel()
+        changeSourceCoroutine = execute {
             ReadBook.upMsg(context.getString(R.string.loading))
             if (book.tocUrl.isEmpty()) {
                 WebBook.getBookInfoAwait(this, source, book)
             }
+            ensureActive()
             val chapters = WebBook.getChapterListAwait(this, source, book)
+            ensureActive()
             val oldBook = ReadBook.book!!
             book.durChapterIndex = BookHelp.getDurChapter(
                 oldBook.durChapterIndex,