IssueTracker

In SystemJobService, it can expect null, and able to tolerance null from WorkManagerImpl.getInstance, due to auto-backup reason.

@Override
public void onCreate() {
    super.onCreate();
    mWorkManagerImpl = WorkManagerImpl.getInstance(getApplicationContext());
    if (mWorkManagerImpl == null) {
        // This can occur if...
        // 1. The app is performing an auto-backup.  Prior to O, JobScheduler could erroneously
        //    try to send commands to JobService in this state (b/32180780).  Since neither
        //    Application#onCreate nor ContentProviders have run, WorkManager won't be
        //    initialized.  In this case, we should ignore all JobScheduler commands and tell it
        //    to retry.
But, current WorkManagerImpl.getInstance(Context context) implementation is that, it will never return null but throw IllegalStateException.

Isn't there's conflict among these 2 SystemJobService.onCreate logic, and WorkManagerImpl.getInstance logic?

Project: platform/frameworks/support
Branch: androidx-master-dev

commit e14104eb7008f82edd50b37e16bd119b307e0554
Author: Sumir Kataria <sumir@google.com>
Date:   Mon Jun 24 10:50:57 2019

    Fix for JobScheduler calls when backup is in progress.
   
    The original fix (ag/Ia1604b7c4b98f6b31869e1161a0c1efce7fe46f2) relied
    on a null-check, but the new version of WorkManager.getInstance(Context)
    with the Context param doesn't return null; it throws an Exception.  This
    CL updates the three places where we explicitly check for the return value
    internally:
   
    1. SystemJobService (the main place where this would manifest)
    2. RescheduleReceiver
    3. WorkManagerTestInitHelper (for consistency)
   
    Fixes: 135858602
    Test: Ran existing tests
    Change-Id: Ia232869712d0c78fd80e91d0a863b8c50a080400

M       work/workmanager-testing/src/main/java/androidx/work/testing/WorkManagerTestInitHelper.java
M       work/workmanager/src/main/java/androidx/work/impl/background/systemalarm/RescheduleReceiver.java
M       work/workmanager/src/main/java/androidx/work/impl/background/systemjob/SystemJobService.java

https://android-review.googlesource.com/988026
https://goto.google.com/android-sha1/e14104eb7008f82edd50b37e16bd119b307e0554