优化

app/src/main/java/io/legado/app/service/HttpReadAloudService.kt

@@ -43,6 +43,7 @@ class HttpReadAloudService : BaseReadAloudService(),
     private val cacheFiles = hashSetOf<String>()
     private var downloadTask: Coroutine<*>? = null
     private var playIndexJob: Job? = null
+    private var downloadTaskIsActive = false
     private var downloadErrorNo: Int = 0
     private var playErrorNo = 0
 
@@ -103,7 +104,12 @@ class HttpReadAloudService : BaseReadAloudService(),
     }
 
     private fun downloadAudio() {
+        launch {
             downloadTask?.cancel()
+            while (downloadTaskIsActive) {
+                //在线tts大部分只能单线程,等待上次访问结束
+                delay(100)
+            }
             downloadTask = execute {
                 clearSpeakCache()
                 removeCacheFile()
@@ -202,6 +208,11 @@ class HttpReadAloudService : BaseReadAloudService(),
                         }
                     }
                 }
+            }.onStart {
+                downloadTaskIsActive = true
+            }.onFinally {
+                downloadTaskIsActive = false
+            }
         }
     }