diff --git a/services/core/java/com/android/server/notification/NotificationHistoryDatabase.java b/services/core/java/com/android/server/notification/NotificationHistoryDatabase.java
index dbaf8241ddd58..377e731fbeeb4 100644
--- a/services/core/java/com/android/server/notification/NotificationHistoryDatabase.java
+++ b/services/core/java/com/android/server/notification/NotificationHistoryDatabase.java
@@ -84,14 +84,12 @@ public class NotificationHistoryDatabase {
     // Current version of the database files schema
     private int mCurrentVersion;
     private final WriteBufferRunnable mWriteBufferRunnable;
-    private final FileAttrProvider mFileAttrProvider;
 
     // Object containing posted notifications that have not yet been written to disk
     @VisibleForTesting
     NotificationHistory mBuffer;
 
-    public NotificationHistoryDatabase(Context context, Handler fileWriteHandler, File dir,
-            FileAttrProvider fileAttrProvider) {
+    public NotificationHistoryDatabase(Context context, Handler fileWriteHandler, File dir) {
         mContext = context;
         mAlarmManager = context.getSystemService(AlarmManager.class);
         mCurrentVersion = DEFAULT_CURRENT_VERSION;
@@ -101,7 +99,6 @@ public class NotificationHistoryDatabase {
         mHistoryFiles = new LinkedList<>();
         mBuffer = new NotificationHistory();
         mWriteBufferRunnable = new WriteBufferRunnable();
-        mFileAttrProvider = fileAttrProvider;
 
         IntentFilter deletionFilter = new IntentFilter(ACTION_HISTORY_DELETION);
         deletionFilter.addDataScheme(SCHEME_DELETION);
@@ -131,8 +128,8 @@ public class NotificationHistoryDatabase {
         }
 
         // Sort with newest files first
-        Arrays.sort(files, (lhs, rhs) -> Long.compare(mFileAttrProvider.getCreationTime(rhs),
-                mFileAttrProvider.getCreationTime(lhs)));
+        Arrays.sort(files, (lhs, rhs) -> Long.compare(Long.parseLong(rhs.getName()),
+                Long.parseLong(lhs.getName())));
 
         for (File file : files) {
             mHistoryFiles.addLast(new AtomicFile(file));
@@ -255,10 +252,9 @@ public class NotificationHistoryDatabase {
 
             for (int i = mHistoryFiles.size() - 1; i >= 0; i--) {
                 final AtomicFile currentOldestFile = mHistoryFiles.get(i);
-                final long creationTime =
-                        mFileAttrProvider.getCreationTime(currentOldestFile.getBaseFile());
+                final long creationTime = Long.parseLong(currentOldestFile.getBaseFile().getName());
                 if (DEBUG) {
-                    Slog.d(TAG, "Pruning " + currentOldestFile.getBaseFile().getName()
+                    Slog.d(TAG, "File " + currentOldestFile.getBaseFile().getName()
                             + " created on " + creationTime);
                 }
                 if (creationTime <= retentionBoundary.getTimeInMillis()) {
@@ -469,24 +465,4 @@ public class NotificationHistoryDatabase {
             }
         }
     }
-
-    public static final class NotificationHistoryFileAttrProvider implements
-            NotificationHistoryDatabase.FileAttrProvider {
-        final static String TAG = "NotifHistoryFileDate";
-
-        public long getCreationTime(File file) {
-            try {
-                BasicFileAttributes attr = Files.readAttributes(FileSystems.getDefault().getPath(
-                        file.getAbsolutePath()), BasicFileAttributes.class);
-                return attr.creationTime().to(TimeUnit.MILLISECONDS);
-            } catch (Exception e) {
-                Slog.w(TAG, "Cannot read creation data for file; using file name");
-                return Long.valueOf(file.getName());
-            }
-        }
-    }
-
-    interface FileAttrProvider {
-        long getCreationTime(File file);
-    }
 }
diff --git a/services/core/java/com/android/server/notification/NotificationHistoryDatabaseFactory.java b/services/core/java/com/android/server/notification/NotificationHistoryDatabaseFactory.java
index b4940a5ab6475..d9e0d79883c54 100644
--- a/services/core/java/com/android/server/notification/NotificationHistoryDatabaseFactory.java
+++ b/services/core/java/com/android/server/notification/NotificationHistoryDatabaseFactory.java
@@ -31,11 +31,10 @@ public class NotificationHistoryDatabaseFactory {
     }
 
     public static NotificationHistoryDatabase create(@NonNull Context context,
-            @NonNull Handler handler, @NonNull File rootDir,
-            @NonNull NotificationHistoryDatabase.FileAttrProvider fileAttrProvider) {
+            @NonNull Handler handler, @NonNull File rootDir) {
         if(sTestingNotificationHistoryDb != null) {
             return sTestingNotificationHistoryDb;
         }
-        return new NotificationHistoryDatabase(context, handler, rootDir, fileAttrProvider);
+        return new NotificationHistoryDatabase(context, handler, rootDir);
     }
 }
diff --git a/services/core/java/com/android/server/notification/NotificationHistoryManager.java b/services/core/java/com/android/server/notification/NotificationHistoryManager.java
index 88e0dc6e9cc45..ab37f67b3db8b 100644
--- a/services/core/java/com/android/server/notification/NotificationHistoryManager.java
+++ b/services/core/java/com/android/server/notification/NotificationHistoryManager.java
@@ -38,7 +38,6 @@ import android.util.SparseBooleanArray;
 import com.android.internal.annotations.GuardedBy;
 import com.android.internal.annotations.VisibleForTesting;
 import com.android.server.IoThread;
-import com.android.server.notification.NotificationHistoryDatabase.NotificationHistoryFileAttrProvider;
 
 import java.io.File;
 import java.util.ArrayList;
@@ -291,7 +290,7 @@ public class NotificationHistoryManager {
             final File historyDir = new File(Environment.getDataSystemCeDirectory(userId),
                     DIRECTORY_PER_USER);
             userHistory = NotificationHistoryDatabaseFactory.create(mContext, IoThread.getHandler(),
-                    historyDir, new NotificationHistoryFileAttrProvider());
+                    historyDir);
             if (mUserUnlockedStates.get(userId)) {
                 try {
                     userHistory.init();
diff --git a/services/tests/uiservicestests/src/com/android/server/notification/NotificationHistoryDatabaseTest.java b/services/tests/uiservicestests/src/com/android/server/notification/NotificationHistoryDatabaseTest.java
index 99b4fd98f9a8b..b7bcbfb055312 100644
--- a/services/tests/uiservicestests/src/com/android/server/notification/NotificationHistoryDatabaseTest.java
+++ b/services/tests/uiservicestests/src/com/android/server/notification/NotificationHistoryDatabaseTest.java
@@ -64,7 +64,6 @@ public class NotificationHistoryDatabaseTest extends UiServiceTestCase {
     Context mContext;
     @Mock
     AlarmManager mAlarmManager;
-    TestFileAttrProvider mFileAttrProvider;
 
     NotificationHistoryDatabase mDataBase;
 
@@ -103,11 +102,9 @@ public class NotificationHistoryDatabaseTest extends UiServiceTestCase {
         when(mContext.getUser()).thenReturn(getContext().getUser());
         when(mContext.getPackageName()).thenReturn(getContext().getPackageName());
 
-        mFileAttrProvider = new TestFileAttrProvider();
         mRootDir = new File(mContext.getFilesDir(), "NotificationHistoryDatabaseTest");
 
-        mDataBase = new NotificationHistoryDatabase(
-                mContext, mFileWriteHandler, mRootDir, mFileAttrProvider);
+        mDataBase = new NotificationHistoryDatabase(mContext, mFileWriteHandler, mRootDir);
         mDataBase.init();
     }
 
@@ -127,7 +124,7 @@ public class NotificationHistoryDatabaseTest extends UiServiceTestCase {
         // add 5 files with a creation date of "today"
         for (long i = cal.getTimeInMillis(); i >= 5; i--) {
             File file = mock(File.class);
-            mFileAttrProvider.creationDates.put(file, i);
+            when(file.getName()).thenReturn(String.valueOf(i));
             AtomicFile af = new AtomicFile(file);
             expectedFiles.add(af);
             mDataBase.mHistoryFiles.addLast(af);
@@ -137,7 +134,7 @@ public class NotificationHistoryDatabaseTest extends UiServiceTestCase {
         // Add 5 more files more than retainDays old
         for (int i = 5; i >= 0; i--) {
             File file = mock(File.class);
-            mFileAttrProvider.creationDates.put(file, cal.getTimeInMillis() - i);
+            when(file.getName()).thenReturn(String.valueOf(cal.getTimeInMillis() - i));
             AtomicFile af = new AtomicFile(file);
             mDataBase.mHistoryFiles.addLast(af);
         }
@@ -331,13 +328,4 @@ public class NotificationHistoryDatabaseTest extends UiServiceTestCase {
         verify(nh).removeConversationFromWrite("pkg", "convo");
         verify(af, never()).startWrite();
     }
-
-    private class TestFileAttrProvider implements NotificationHistoryDatabase.FileAttrProvider {
-        public Map<File, Long> creationDates = new HashMap<>();
-
-        @Override
-        public long getCreationTime(File file) {
-            return creationDates.get(file);
-        }
-    }
 }