diff --git a/library/src/main/AndroidManifest.xml b/library/src/main/AndroidManifest.xml
index 90b5b3d..dd0b718 100644
--- a/library/src/main/AndroidManifest.xml
+++ b/library/src/main/AndroidManifest.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-  package="mejust.frame">
+   package="mejust.frame">
 
   <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
   <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
@@ -14,13 +14,13 @@
 
     </service>
     <provider
-      android:name="android.support.v4.content.FileProvider"
-      android:authorities="${applicationId}.versionProvider"
-      android:exported="false"
-      android:grantUriPermissions="true">
+       android:name="android.support.v4.content.FileProvider"
+       android:authorities="${applicationId}.versionProvider"
+       android:exported="false"
+       android:grantUriPermissions="true">
       <meta-data
-        android:name="android.support.FILE_PROVIDER_PATHS"
-        android:resource="@xml/version_upgrade_file_path" />
+         android:name="android.support.FILE_PROVIDER_PATHS"
+         android:resource="@xml/version_upgrade_file_path"/>
     </provider>
   </application>
 
diff --git a/library/src/main/java/mejust/frame/common/upgrade/NotificationProgress.java b/library/src/main/java/mejust/frame/common/upgrade/NotificationProgress.java
index 25b500d..288b444 100644
--- a/library/src/main/java/mejust/frame/common/upgrade/NotificationProgress.java
+++ b/library/src/main/java/mejust/frame/common/upgrade/NotificationProgress.java
@@ -31,7 +31,7 @@ public NotificationProgress(Context context, ProgressMessageBuilder progressMess
             String name = "应用更新";
             String description = "Prompt to say that you received the offer";
             NotificationChannel channel =
-                    new NotificationChannel(CHANNEL, name, NotificationManager.IMPORTANCE_DEFAULT);
+                    new NotificationChannel(CHANNEL, name, NotificationManager.IMPORTANCE_LOW);
             channel.setDescription(description);
             NotificationManager notificationManager =
                     (NotificationManager) context.getSystemService(NOTIFICATION_SERVICE);
@@ -51,14 +51,16 @@ public NotificationProgress(Context context, ProgressMessageBuilder progressMess
     @Override
     public void updateProgress(int progress) {
         notificationBuilder.setProgress(100, progress, false)
-                .setContentText(Utils.getApp().getResources().getString(R.string.download_ing_frame));
+                .setContentText(
+                        Utils.getApp().getResources().getString(R.string.download_ing_frame));
         notificationManager.notify(NOTIFICATION_ID, notificationBuilder.build());
     }
 
     @Override
     public void downloadSuccess() {
         notificationBuilder.setProgress(0, 0, false)
-                .setContentText(Utils.getApp().getResources().getString(R.string.download_success_frame));
+                .setContentText(
+                        Utils.getApp().getResources().getString(R.string.download_success_frame));
         notificationManager.notify(NOTIFICATION_ID, notificationBuilder.build());
         notificationManager.cancel(NOTIFICATION_ID);
     }
@@ -66,7 +68,8 @@ public void downloadSuccess() {
     @Override
     public void downloadFail() {
         notificationBuilder.setProgress(0, 0, false)
-                .setContentText(Utils.getApp().getResources().getString(R.string.download_fail_frame));
+                .setContentText(
+                        Utils.getApp().getResources().getString(R.string.download_fail_frame));
         notificationManager.notify(NOTIFICATION_ID, notificationBuilder.build());
         notificationManager.cancel(NOTIFICATION_ID);
     }