diff --git a/app/build.gradle b/app/build.gradle
index f21eb15..b336565 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -19,7 +19,3 @@ android {
         }
     }
 }
-
-dependencies {
-    compile files('src/main/extra/system.jar')
-}
diff --git a/app/src/main/aidl/android/content/pm/IPackageStatsObserver.aidl b/app/src/main/aidl/android/content/pm/IPackageStatsObserver.aidl
index e69de29..e282094 100644
--- a/app/src/main/aidl/android/content/pm/IPackageStatsObserver.aidl
+++ b/app/src/main/aidl/android/content/pm/IPackageStatsObserver.aidl
@@ -0,0 +1,28 @@
+/*
+**
+** Copyright 2007, The Android Open Source Project
+**
+** 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 android.content.pm;
+import android.content.pm.PackageStats;
+/**
+ * API for package data change related callbacks from the Package Manager.
+ * Some usage scenarios include deletion of cache directory, generate
+ * statistics related to code, data, cache usage(TODO)
+ * {@hide}
+ */
+oneway interface IPackageStatsObserver {
+    
+    void onGetStatsCompleted(in PackageStats pStats, boolean succeeded);
+}
diff --git a/app/src/main/aidl/android/content/pm/PackageStats.aidl b/app/src/main/aidl/android/content/pm/PackageStats.aidl
index e69de29..483a0d1 100644
--- a/app/src/main/aidl/android/content/pm/PackageStats.aidl
+++ b/app/src/main/aidl/android/content/pm/PackageStats.aidl
@@ -0,0 +1,18 @@
+/* //device/java/android/android/view/WindowManager.aidl
+**
+** Copyright 2007, The Android Open Source Project
+**
+** 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 android.content.pm;
+parcelable PackageStats;