diff --git a/README.md b/README.md
index 25ccf3af..d6c50696 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,7 @@ Aria，致力于让下载傻瓜化</br>
 ## 下载
 [![Download](https://api.bintray.com/packages/arialyy/maven/Aria/images/download.svg)](https://bintray.com/arialyy/maven/Aria/_latestVersion)</br>
 ```java
-compile 'com.arialyy.aria:Aria:2.4.2'
+compile 'com.arialyy.aria:Aria:2.4.4'
 ```
 
 ## 示例
diff --git a/app/src/main/java/com/arialyy/simple/single_task/SingleTaskActivity.java b/app/src/main/java/com/arialyy/simple/single_task/SingleTaskActivity.java
index b888a99a..9de01d3c 100644
--- a/app/src/main/java/com/arialyy/simple/single_task/SingleTaskActivity.java
+++ b/app/src/main/java/com/arialyy/simple/single_task/SingleTaskActivity.java
@@ -201,67 +201,6 @@ public class SingleTaskActivity extends BaseActivity<ActivitySingleBinding> {
         .setDownloadPath(Environment.getExternalStorageDirectory().getPath() + "/test.apk")
         .setDownloadName("test.apk")
         .start();
-    //DownloadEntity entity = new DownloadEntity();
-    //entity.setDownloadUrl(DOWNLOAD_URL);
-    //entity.setDownloadPath(Environment.getExternalStorageDirectory().getPath() + "/test.apk");
-    //entity.setFileName("test.apk");
-    //DownloadUtil util = new DownloadUtil(this, entity, new IDownloadListener() {
-    //  long fileSize = 1;
-    //  @Override public void supportBreakpoint(boolean support) {
-    //
-    //  }
-    //
-    //  @Override public void onCancel() {
-    //
-    //  }
-    //
-    //  @Override public void onFail() {
-    //
-    //  }
-    //
-    //  @Override public void onPre() {
-    //
-    //  }
-    //
-    //  @Override public void onPostPre(long fileSize) {
-    //    this.fileSize = fileSize;
-    //  }
-    //
-    //  @Override public void onProgress(long currentLocation) {
-    //    long current = currentLocation;
-    //    long len = fileSize;
-    //    if (len == 0) {
-    //      mPb.setProgress(0);
-    //    } else {
-    //      mPb.setProgress((int) ((current * 100) / len));
-    //    }
-    //  }
-    //
-    //  @Override public void onChildComplete(long finishLocation) {
-    //
-    //  }
-    //
-    //  @Override public void onStart(long startLocation) {
-    //
-    //  }
-    //
-    //  @Override public void onChildResume(long resumeLocation) {
-    //
-    //  }
-    //
-    //  @Override public void onResume(long resumeLocation) {
-    //
-    //  }
-    //
-    //  @Override public void onStop(long stopLocation) {
-    //
-    //  }
-    //
-    //  @Override public void onComplete() {
-    //
-    //  }
-    //});
-    //util.startDownload();
   }
 
   private void stop() {