diff --git a/android/util.go b/android/util.go
index 234bda3..947af69 100644
--- a/android/util.go
+++ b/android/util.go
@@ -144,22 +144,28 @@
 	return m
 }
 
-// ListDifference checks if the two lists contain the same elements
-func ListDifference[T comparable](l1, l2 []T) []T {
-	diff := []T{}
+// ListSetDifference checks if the two lists contain the same elements. It returns
+// a boolean which is true if there is a difference, and then returns lists of elements
+// that are in l1 but not l2, and l2 but not l1.
+func ListSetDifference[T comparable](l1, l2 []T) (bool, []T, []T) {
+	listsDiffer := false
+	diff1 := []T{}
+	diff2 := []T{}
 	m1 := setFromList(l1)
 	m2 := setFromList(l2)
-	for _, t := range l1 {
+	for t := range m1 {
 		if _, ok := m2[t]; !ok {
-			diff = append(diff, t)
+			diff1 = append(diff1, t)
+			listsDiffer = true
 		}
 	}
-	for _, t := range l2 {
+	for t := range m2 {
 		if _, ok := m1[t]; !ok {
-			diff = append(diff, t)
+			diff2 = append(diff2, t)
+			listsDiffer = true
 		}
 	}
-	return diff
+	return listsDiffer, diff1, diff2
 }
 
 // Returns true if the given string s is prefixed with any string in the given prefix list.