Catch correct exception from Context.startService

Issue: #7306
PiperOrigin-RevId: 309392633

RELEASENOTES.md

@@ -22,6 +22,7 @@
         ([#6950](https://github.com/google/ExoPlayer/pull/6950)).
 *   AV1 extension: Add a heuristic to determine the default number of threads
     used for AV1 playback using the extension.
+*   DownloadService: Fix "Not allowed to start service" `IllegalStateException`.
 
 ### 2.11.4 (2020-04-08) ###
 

library/core/src/main/java/com/google/android/exoplayer2/offline/DownloadService.java

@@ -1022,7 +1022,7 @@ public abstract class DownloadService extends Service {
         try {
           Intent intent = getIntent(context, serviceClass, DownloadService.ACTION_INIT);
           context.startService(intent);
-        } catch (IllegalArgumentException e) {
+        } catch (IllegalStateException e) {
           // The process is classed as idle by the platform. Starting a background service is not
           // allowed in this state.
           Log.w(TAG, "Failed to restart DownloadService (process is idle).");