diff --git a/okdownload/src/main/java/com/liulishuo/okdownload/core/dispatcher/CallbackDispatcher.java b/okdownload/src/main/java/com/liulishuo/okdownload/core/dispatcher/CallbackDispatcher.java
index <HASH>..<HASH> 100644
--- a/okdownload/src/main/java/com/liulishuo/okdownload/core/dispatcher/CallbackDispatcher.java
+++ b/okdownload/src/main/java/com/liulishuo/okdownload/core/dispatcher/CallbackDispatcher.java
@@ -45,11 +45,6 @@ public class CallbackDispatcher {
 
     private final Handler uiHandler;
 
-    CallbackDispatcher(@NonNull Handler handler, @NonNull DownloadListener transmit) {
-        this.uiHandler = handler;
-        this.transmit = transmit;
-    }
-
     CallbackDispatcher(@NonNull Handler handler) {
         this.uiHandler = handler;
         this.transmit = new DefaultTransmitListener();
refactor: remove useless constructor of callback-dispatcher