Used Android Studio Refactor tool to convert to AppCompat (had to change some references back to just Activity to get it to compile

app/src/main/res/layout/activity_authenticate.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"
     android:orientation="vertical">
@@ -15,7 +16,7 @@
             android:background="#FFFFFF"
             android:contentDescription="@string/app_name"
             android:scaleType="center"
-            android:src="@drawable/star_of_life_24x24" />
+            app:srcCompat="@drawable/star_of_life_24x24" />
 
         <TextView
             android:layout_width="wrap_content"