Merge pull request #1759 from ag2s20150909/epublazy

优化

app/src/main/java/io/legado/app/help/http/cronet/AbsCallBack.kt

@@ -2,6 +2,7 @@ package io.legado.app.help.http.cronet
 
 import io.legado.app.help.http.okHttpClient
 import io.legado.app.utils.DebugLog
+import io.legado.app.utils.rethrowAsIOException
 import okhttp3.*
 import okhttp3.EventListener
 import okhttp3.MediaType.Companion.toMediaTypeOrNull
@@ -123,7 +124,7 @@ abstract class AbsCallBack(
     //UrlResponseInfo可能为null
     override fun onFailed(request: UrlRequest, info: UrlResponseInfo?, error: CronetException) {
         DebugLog.i(javaClass.name, error.message.toString())
-        mException = IOException(error.message, error)
+        mException = error.rethrowAsIOException()
         this.eventListener?.callFailed(mCall, error)
         responseCallback?.onFailure(mCall, error)
     }

app/src/main/java/io/legado/app/help/http/cronet/CronetLoader.kt

@@ -55,9 +55,12 @@ object CronetLoader : CronetEngine.Builder.LibraryLoader() {
      * 判断Cronet是否安装完成
      */
     fun install(): Boolean {
-        if (cacheInstall) {
-            return true
+        synchronized(this) {
+            if (cacheInstall) {
+                return true
+            }
         }
+
         if (AppConfig.isGooglePlay) {
             return false
         }

app/src/main/java/io/legado/app/utils/ThrowableExtensions.kt

@@ -1,5 +1,7 @@
 package io.legado.app.utils
 
+import java.io.IOException
+
 val Throwable.msg: String
     get() {
         val stackTrace = stackTraceToString()
@@ -8,4 +10,10 @@ val Throwable.msg: String
             stackTrace.isNotEmpty() -> stackTrace
             else -> lMsg
         }
-    }
+    }
+
+fun Throwable.rethrowAsIOException(): IOException {
+    val newException = IOException(this.message)
+    newException.initCause(this)
+    throw newException
+}