feat: 优化代码

app/src/main/assets/updateLog.md

@@ -2,6 +2,9 @@
 * 旧版数据导入教程：先在旧版阅读(2.x)中进行备份，然后在新版阅读(3.x)【我的】->【备份与恢复】，选择【导入旧版本数据】。
 * 请关注[开源阅读软件]()支持我,同时关注合作公众号[小说拾遗](),阅读公众号小编。
 
+**2020/03/14**
+* 加载正文无书源时自动换源
+
 **2020/03/14**
 * 修改导航栏图标
 

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

@@ -157,12 +157,17 @@ class ReadBookViewModel(application: Application) : BaseViewModel(application) {
 
     private fun autoChangeSource(name: String, author: String) {
         execute {
-            App.db.bookSourceDao().allTextEnabled.forEach {
+            App.db.bookSourceDao().allTextEnabled.forEach { source ->
                 try {
-                    val searchBooks = WebBook(it).searchBookSuspend(name)
-
+                    val searchBooks = WebBook(source).searchBookSuspend(name)
+                    searchBooks.getOrNull(0)?.let {
+                        if (it.name == name && (it.author == author || author == "")) {
+                            changeTo(it.toBook())
+                            return@forEach
+                        }
+                    }
                 } catch (e: Exception) {
-
+                    //nothing
                 }
             }
         }.onStart {