diff --git a/Aria/src/main/java/com/arialyy/aria/core/inf/AbsTarget.java b/Aria/src/main/java/com/arialyy/aria/core/inf/AbsTarget.java
index 66e03cfb..4a286ba5 100644
--- a/Aria/src/main/java/com/arialyy/aria/core/inf/AbsTarget.java
+++ b/Aria/src/main/java/com/arialyy/aria/core/inf/AbsTarget.java
@@ -48,6 +48,14 @@ public abstract class AbsTarget<ENTITY extends AbsEntity, TASK_ENTITY extends Ab
     return this;
   }
 
+  /**
+   * 获取存放的扩展字段
+   * 设置扩展字段{@link #setExtendField(String)}
+   */
+  public String getExtendField() {
+    return entity.getStr();
+  }
+
   /**
    * 获取任务状态
    *
@@ -87,11 +95,7 @@ public abstract class AbsTarget<ENTITY extends AbsEntity, TASK_ENTITY extends Ab
    * 删除记录
    */
   public void removeRecord() {
-    if (entity instanceof DownloadEntity) {
-      ((DownloadEntity) entity).deleteData();
-    } else if (entity instanceof UploadEntity) {
-      ((UploadEntity) entity).deleteData();
-    }
+    entity.deleteData();
   }
 
   /**
diff --git a/aria/src/main/java/com/arialyy/aria/core/scheduler/AbsSchedulerListener.java b/aria/src/main/java/com/arialyy/aria/core/scheduler/AbsSchedulerListener.java
deleted file mode 100644
index ae411967..00000000
--- a/aria/src/main/java/com/arialyy/aria/core/scheduler/AbsSchedulerListener.java
+++ /dev/null
@@ -1,67 +0,0 @@
-/*
- * Copyright (C) 2016 AriaLyy(https://github.com/AriaLyy/Aria)
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package com.arialyy.aria.core.scheduler;
-
-import com.arialyy.aria.core.inf.ITask;
-
-/**
- * Created by Aria.Lao on 2017/6/7.
- */
-public class AbsSchedulerListener<TASK extends ITask> implements ISchedulerListener<TASK> {
-  @Override public void onPre(TASK task) {
-
-  }
-
-  @Override public void onTaskPre(TASK task) {
-
-  }
-
-  @Override public void onTaskResume(TASK task) {
-
-  }
-
-  @Override public void onTaskStart(TASK task) {
-
-  }
-
-  @Override public void onTaskStop(TASK task) {
-
-  }
-
-  @Override public void onTaskCancel(TASK task) {
-
-  }
-
-  @Override public void onTaskFail(TASK task) {
-
-  }
-
-  @Override public void onTaskComplete(TASK task) {
-
-  }
-
-  @Override public void onTaskRunning(TASK task) {
-
-  }
-
-  public void onNoSupportBreakPoint(TASK task) {
-
-  }
-
-  public void setListener(Object obj) {
-
-  }
-}
diff --git a/build.gradle b/build.gradle
index e24ee924..6ed8ae83 100644
--- a/build.gradle
+++ b/build.gradle
@@ -37,7 +37,7 @@ ext {
   userOrg = 'arialyy'
   groupId = 'com.arialyy.aria'
 //  publishVersion = '0.0.6'
-  publishVersion = '3.1.7'
+  publishVersion = '3.1.8'
   repoName='maven'
   desc = 'android 下载框架'
   website = 'https://github.com/AriaLyy/Aria'