Avoid IPC call with an empty array

Don't call setNotificationsShown() from status bar when notifications
are hiding. It should only be called when there's some new notification
to report as seen. This is just an optimization.

Bug: 21785854
Change-Id: I1f6024fea29694201284bd27d4b30460a62f0b57

1 files changed, 7 insertions, 4 deletions

diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
index a637e24..135e2d2 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
@@ -3035,11 +3035,14 @@ public class PhoneStatusBar extends BaseStatusBar implements DemoMode,
         }
 
         final int N = newlyVisible.size();
-        String[] newlyVisibleKeyAr = new String[N];
-        for (int i = 0; i < N; i++) {
-            newlyVisibleKeyAr[i] = newlyVisibleAr[i].key;
+        if (N > 0) {
+            String[] newlyVisibleKeyAr = new String[N];
+            for (int i = 0; i < N; i++) {
+                newlyVisibleKeyAr[i] = newlyVisibleAr[i].key;
+            }
+
+            setNotificationsShown(newlyVisibleKeyAr);
         }
-        setNotificationsShown(newlyVisibleKeyAr);
     }
 
     // State logging