Ensure files get mediascanned after the download is completed.

Update file size in MediaStore to 0 before triggering mediascan
which should force MediaScanner to scan this file.

Also, add a clean-up job to trigger mediscan on already existing
downloads which should have been mediascanned but haven't and got
stuck in this state.

Bug: 138419471
Test: manual
Test: atest DownloadProviderTests
Test: atest cts/tests/app/src/android/app/cts/DownloadManagerTest.java
Test: atest DownloadManagerLegacy
Test: atest DownloadManagerApi28
Change-Id: I813086ceba6c70ca42309fcce5f9db209eac1575
(cherry picked from commit c2b0739b08e423e3c9fcde42b095cd72315ecf1f)

1 files changed, 11 insertions, 0 deletions

diff --git a/src/com/android/providers/downloads/Constants.java b/src/com/android/providers/downloads/Constants.java
index 79daeaed..c822c7c6 100644
--- a/src/com/android/providers/downloads/Constants.java
+++ b/src/com/android/providers/downloads/Constants.java
@@ -83,6 +83,17 @@ public class Constants {
     /** The default user agent used for downloads */
     public static final String DEFAULT_USER_AGENT;
 
+    /**
+     * Job id for the periodic service to clean-up stale and orphan downloads.
+     */
+    public static final int IDLE_JOB_ID = -100;
+
+    /**
+     * Job id for a one-time clean-up job to trigger mediascan on files which should have been
+     * mediascanned earlier when they were downloaded but didn't get scanned.
+     */
+    public static final int MEDIA_SCAN_TRIGGER_JOB_ID = -101;
+
     static {
         final StringBuilder builder = new StringBuilder();