Fix a problem where audio preview would continue without any way to stop it.
http://b/3061678

Change-Id: I58a334bd5aa7eb9cf3f84cd033612339aa594cd1
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 537d742..26de142 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -87,6 +87,7 @@
         </activity>
 
         <activity android:name="AudioPreview" android:theme="@android:style/Theme.Dialog"
+                android:taskAffinity=""
                 android:excludeFromRecents="true" android:exported="true" >
             <intent-filter>
                 <action android:name="android.intent.action.VIEW" />