diff --git a/app/build.gradle b/app/build.gradle
index 0750185b..1628375a 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,5 @@
+import javax.annotation.Nullable
+
 buildscript {
     repositories {
         mavenCentral()
diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro
index ee0e6965..3500b56c 100644
--- a/app/proguard-rules.pro
+++ b/app/proguard-rules.pro
@@ -16,6 +16,9 @@
 #   public *;
 #}
 
+-dontwarn
+-ignorewarnings
+
 # RetroFit
 -dontwarn retrofit.**
 -keep class retrofit.** { *; }
@@ -41,6 +44,3 @@
 }
 
 -keep class !android.support.v7.internal.view.menu.**,** {*;}
-
--dontwarn
--ignorewarnings
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index e0b7681a..8cc3bfd1 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -122,6 +122,7 @@
             android:name=".appshortcuts.AppShortcutLauncherActivity"
             android:launchMode="singleInstance"
             android:theme="@android:style/Theme.Translucent.NoTitleBar" />
+        <activity android:name=".ui.activities.PurchaseActivity" />
 
         <service
             android:name=".service.MusicService"
@@ -202,7 +203,6 @@
                 android:resource="@xml/app_widget_card_info" />
         </receiver>
 
-        <activity android:name=".ui.activities.PurchaseActivity"></activity>
         <provider
             android:name="android.support.v4.content.FileProvider"
             android:authorities="${applicationId}"