diff --git a/app/build.gradle b/app/build.gradle
index e4ad635..92bbcff 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,7 +1,7 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 18
+    compileSdkVersion 21
     buildToolsVersion "23.0.2"
     defaultConfig {
         applicationId "com.keyboard_crumbs.xiaomiantsalarmservice"
diff --git a/app/src/main/java/com/keyboard_crumbs/xiaomiantsalarmservice/AntsNotificationsService.java b/app/src/main/java/com/keyboard_crumbs/xiaomiantsalarmservice/AntsNotificationsService.java
index 6fec5e7..d6cd95f 100644
--- a/app/src/main/java/com/keyboard_crumbs/xiaomiantsalarmservice/AntsNotificationsService.java
+++ b/app/src/main/java/com/keyboard_crumbs/xiaomiantsalarmservice/AntsNotificationsService.java
@@ -50,5 +50,10 @@ public class AntsNotificationsService extends NotificationListenerService {
         }
     }
 
+    @Override
+    public void onNotificationRemoved(StatusBarNotification sbn) {
+
+    }
+
 
 }
\ No newline at end of file