Remove notification channels from history when they're deleted.

To make this possible, this change adds functionality for notification channel removal to NotificationHistory, NotificationHistoryDatabase, and NotificationHistoryManager and corresponding tests.

This change does not remove the notifications from deleted channels from the "recently dismissed" list (stored in mArchive); will follow up with that later.

Test: atest NotificationHistoryTest, NotificationHistoryDatabaseTest, NotificationManagerServiceTest; manual via creating channels, deleting them and verifying
Bug: 169349809

Change-Id: I7b1c137e516d14703665750f06554ac7ca44c90e

1 files changed, 20 insertions, 0 deletions

diff --git a/core/java/android/app/NotificationHistory.java b/core/java/android/app/NotificationHistory.java
index 0c8188b9a51e..eb9ec869af12 100644
--- a/core/java/android/app/NotificationHistory.java
+++ b/core/java/android/app/NotificationHistory.java
@@ -404,6 +404,26 @@ public final class NotificationHistory implements Parcelable {
     }
 
     /**
+     * Removes all notifications from a channel and regenerates the string pool
+     */
+    public boolean removeChannelFromWrite(String packageName, String channelId) {
+        boolean removed = false;
+        for (int i = mNotificationsToWrite.size() - 1; i >= 0; i--) {
+            HistoricalNotification hn = mNotificationsToWrite.get(i);
+            if (packageName.equals(hn.getPackage())
+                    && Objects.equals(channelId, hn.getChannelId())) {
+                removed = true;
+                mNotificationsToWrite.remove(i);
+            }
+        }
+        if (removed) {
+            poolStringsFromNotifications();
+        }
+
+        return removed;
+    }
+
+    /**
      * Gets pooled strings in order to write them to disk
      */
     public @NonNull String[] getPooledStringsToWrite() {