Fix zen mode allowed event preference summary.

Simply using lower-cased versions of other strings might work for
English, but not for most other languages.
Also improve formatting of list: Instead of showing 'a, b, c', show 'a,
b and c'.

Change-Id: I7a809e0655cbde3af1695ec3ddf86ec818fb191d

1 files changed, 21 insertions, 0 deletions

diff --git a/src/com/android/settings/Utils.java b/src/com/android/settings/Utils.java
index 630858b6b..ef633e1d4 100644
--- a/src/com/android/settings/Utils.java
+++ b/src/com/android/settings/Utils.java
@@ -1453,4 +1453,25 @@ public final class Utils {
                 UserManager.DISALLOW_SMS, userHandle);
         return !callSmsNotAllowed;
     }
+
+    public static String join(Resources res, List<String> items) {
+        final int count = items.size();
+        if (items.isEmpty()) {
+            return null;
+        } else if (count == 1) {
+            return items.get(0);
+        } else if (count == 2) {
+            return res.getString(R.string.join_two_items, items.get(0), items.get(1));
+        } else {
+            String middle = items.get(count - 2);
+            for (int i = count - 3; i > 0; i--) {
+                middle = res.getString(R.string.join_many_items_middle,
+                        items.get(i), middle);
+            }
+            final String allButLast = res.getString(R.string.join_many_items_first,
+                    items.get(0), middle);
+            return res.getString(R.string.join_many_items_last, allButLast,
+                    items.get(count - 1));
+        }
+    }
 }