Merge pull request #10776 from dongvanhung:feature/add_support_clear_download_manager_helpers

PiperOrigin-RevId: 491336828
(cherry picked from commit 3581ccde29)

RELEASENOTES.md

@@ -11,6 +11,8 @@
         ([#10604](https://github.com/google/ExoPlayer/issues/10604)).
     *   Add `ExoPlayer.Builder.setPlaybackLooper` that sets a pre-existing
         playback thread for a new ExoPlayer instance.
+    *   Allow download manager helpers to be cleared
+        ([#10776](https://github.com/google/ExoPlayer/issues/10776)).
 *   Session:
     *   Add helper method to convert platform session token to Media3
         `SessionToken` ([#171](https://github.com/androidx/media/issues/171)).

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/offline/DownloadService.java

@@ -574,6 +574,17 @@ public abstract class DownloadService extends Service {
     Util.startForegroundService(context, intent);
   }
 
+  /**
+   * Clear all {@linkplain DownloadManagerHelper download manager helpers} before restarting the
+   * service.
+   *
+   * <p>Calling this method is normally only required if an app supports downloading content for
+   * multiple users for which different download directories should be used.
+   */
+  public static void clearDownloadManagerHelpers() {
+    downloadManagerHelpers.clear();
+  }
+
   @Override
   public void onCreate() {
     if (channelId != null) {