Implement priority ordering in notifications.

Ongoings are the only notifications currently given higher
priority (and it's in an internal data structure, not a
public API, so fear not about abuse---this will be no worse
than on the phone where ongoings floated to the top).

The only thing left is to give privileged customers a way to
alter the priority of their notifications.

Bug: 3412807
Bug: 3146719
Change-Id: I9e738cc413982845cf4858faa8ccd0a7dbf3187c

core/java/com/android/internal/statusbar/StatusBarNotification.java

@@ -35,12 +35,18 @@ if (truncatedTicker != null && truncatedTicker.length() > maxTickerLen) {
 */
 
 public class StatusBarNotification implements Parcelable {
+    public static int PRIORITY_JIFFY_EXPRESS = -100;
+    public static int PRIORITY_NORMAL        = 0;
+    public static int PRIORITY_ONGOING       = 100;
+    public static int PRIORITY_SYSTEM        = 200;
+
     public String pkg;
     public int id;
     public String tag;
     public int uid;
     public int initialPid;
     public Notification notification;
+    public int priority = PRIORITY_NORMAL;
 
     public StatusBarNotification() {
     }
@@ -56,6 +62,9 @@ public class StatusBarNotification implements Parcelable {
         this.uid = uid;
         this.initialPid = initialPid;
         this.notification = notification;
+
+        this.priority = ((notification.flags & Notification.FLAG_ONGOING_EVENT) != 0)
+            ? PRIORITY_ONGOING : PRIORITY_NORMAL;
     }
 
     public StatusBarNotification(Parcel in) {
@@ -72,6 +81,7 @@ public class StatusBarNotification implements Parcelable {
         }
         this.uid = in.readInt();
         this.initialPid = in.readInt();
+        this.priority = in.readInt();
         this.notification = new Notification(in);
     }
 
@@ -86,6 +96,7 @@ public class StatusBarNotification implements Parcelable {
         }
         out.writeInt(this.uid);
         out.writeInt(this.initialPid);
+        out.writeInt(this.priority);
         this.notification.writeToParcel(out, flags);
     }
 
@@ -114,7 +125,7 @@ public class StatusBarNotification implements Parcelable {
 
     public String toString() {
         return "StatusBarNotification(package=" + pkg + " id=" + id + " tag=" + tag
-                + " notification=" + notification + ")";
+                + " notification=" + notification + " priority=" + priority + ")";
     }
 
     public boolean isOngoing() {

packages/SystemUI/src/com/android/systemui/statusbar/NotificationData.java

@@ -48,7 +48,12 @@ public class NotificationData {
     private final ArrayList<Entry> mEntries = new ArrayList<Entry>();
     private final Comparator<Entry> mEntryCmp = new Comparator<Entry>() {
         public int compare(Entry a, Entry b) {
-            return (int)(a.notification.notification.when - b.notification.notification.when);
+            final StatusBarNotification na = a.notification;
+            final StatusBarNotification nb = b.notification;
+            int priDiff = na.priority - nb.priority;
+            return (priDiff != 0)
+                ? priDiff
+                : (int)(na.notification.when - nb.notification.when);
         }
     };
 

packages/SystemUI/src/com/android/systemui/statusbar/tablet/TabletStatusBar.java

@@ -670,7 +670,8 @@ public class TabletStatusBar extends StatusBar implements
                 && oldContentView.getLayoutId() == contentView.getLayoutId();
         ViewGroup rowParent = (ViewGroup) oldEntry.row.getParent();
         boolean orderUnchanged = notification.notification.when==oldNotification.notification.when
-                && notification.isOngoing() == oldNotification.isOngoing();
+                && notification.priority == oldNotification.priority; 
+                // priority now encompasses isOngoing()
         boolean isLastAnyway = rowParent.indexOfChild(oldEntry.row) == rowParent.getChildCount()-1;
         if (contentsUnchanged && (orderUnchanged || isLastAnyway)) {
             if (DEBUG) Slog.d(TAG, "reusing notification for key: " + key);
@@ -1187,7 +1188,10 @@ public class TabletStatusBar extends StatusBar implements
         }
 
         // Add the icon.
-        mNotns.add(entry);
+        int pos = mNotns.add(entry);
+        if (DEBUG) {
+            Slog.d(TAG, "addNotificationViews: added at " + pos);
+        }
         updateNotificationIcons();
 
         return iconView;
@@ -1274,7 +1278,7 @@ public class TabletStatusBar extends StatusBar implements
         for (int i=0; i<toShow.size(); i++) {
             View v = toShow.get(i);
             if (v.getParent() == null) {
-                mPile.addView(toShow.get(i));
+                mPile.addView(v, N-1-i); // the notification panel has newest at the bottom
             }
         }