"Added config changes to retain drawing on rotation"

draw/src/main/AndroidManifest.xml

@@ -5,7 +5,8 @@
     <application android:name=".DrawApplication">
         <activity
             android:name=".main.ui.DrawingActivity"
-            android:theme="@style/Theme.AppCompat.Light.NoActionBar" />
+            android:theme="@style/Theme.AppCompat.Light.NoActionBar"
+            android:configChanges="orientation|screenSize|keyboardHidden"/>
     </application>
 
 </manifest>
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