Minor edits

app/build.gradle

@@ -1,3 +1,5 @@
+import javax.annotation.Nullable
+
 buildscript {
     repositories {
         mavenCentral()

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

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}"