Move DownloadManager to use JobScheduler.

JobScheduler is in a much better position to coordinate tasks across
the platform to optimize battery and RAM usage.  This change removes
a bunch of manual scheduling logic by representing each download as
a separate job with relevant scheduling constraints.  Requested
network types, retry backoff timing, and newly added charging and
idle constraints are plumbed through as job parameters.

When a job times out, we halt the download and schedule it to resume
later.  The majority of downloads should have ETag values to enable
resuming like this.

Remove local wakelocks, since the platform now acquires and blames
our jobs on the requesting app.

When an active download is pushing updates to the database, check for
both paused and cancelled state to quickly halt an ongoing download.

Shift DownloadNotifier to update directly based on a Cursor, since we
no longer have the overhead of fully-parsed DownloadInfo objects.

Unify a handful of worker threads into a single shared thread.

Remove legacy "large download" activity that was thrown in the face
of the user; the UX best-practice is to go through notification, and
update that dialog to let the user override and continue if under
the hard limit.

Bug: 28098882, 26571724
Change-Id: I33ebe59b3c2ea9c89ec526f70b1950c734abc4a7

1 files changed, 3 insertions, 14 deletions

diff --git a/src/com/android/providers/downloads/SystemFacade.java b/src/com/android/providers/downloads/SystemFacade.java
index 7f97b919..e7852e95 100644
--- a/src/com/android/providers/downloads/SystemFacade.java
+++ b/src/com/android/providers/downloads/SystemFacade.java
@@ -27,33 +27,22 @@ interface SystemFacade {
      */
     public long currentTimeMillis();
 
-    /**
-     * @return Currently active network, or null if there's no active
-     *         connection.
-     */
-    public NetworkInfo getActiveNetworkInfo(int uid);
-
     public Network getActiveNetwork(int uid);
 
-    public boolean isActiveNetworkMetered();
-
-    /**
-     * @see android.telephony.TelephonyManager#isNetworkRoaming
-     */
-    public boolean isNetworkRoaming();
+    public NetworkInfo getNetworkInfo(Network network);
 
     /**
      * @return maximum size, in bytes, of downloads that may go over a mobile connection; or null if
      * there's no limit
      */
-    public Long getMaxBytesOverMobile();
+    public long getMaxBytesOverMobile();
 
     /**
      * @return recommended maximum size, in bytes, of downloads that may go over a mobile
      * connection; or null if there's no recommended limit.  The user will have the option to bypass
      * this limit.
      */
-    public Long getRecommendedMaxBytesOverMobile();
+    public long getRecommendedMaxBytesOverMobile();
 
     /**
      * Send a broadcast intent.