Due to an Android P bug, we basically need to stop calling
startService() in onResume()/onPause(). That means I had to turn
MessageRetrieval service into a singlton instead of a service. I also
moved the offending KeyCachingService calls into static methods that
didn't have to start the service.
If we already have two active processing GCM messages, there's no
benefit to a third. In fact, enqueuing additional ones will likely only
end up showing the foreground notification unnecessariliy.
Previously we were starting a background service, which isn't allowed
for targetSdk 26. This will do the same thing but at a time decided by
the system.
This gives us more control over when it happens, as well as lets us set
things like the debug level. Also let's us get rid of the synchronized
block we had in Application#onCreate().
This sound isn't supposed to play when you have notification sound off,
but apparently some Huawei phones will play it anyway. Until we can
figure out a better way to handle it, we're just removing it.
We don't store non-user-selected colors in the database. That means that
when we update the palette, we still have to hash based off of the legacy
palette when generating a color if we want to migrate to a
similar-looking color.
Unfortunately, because the new palette is smaller, some colors are
"overloaded", meaning that when we hash based off of the legacy palette,
some colors will be more/less common than others. To fix this, we simply
persist all current colors in the database, then switch our hashing list
to what we really want.
Occasionally a job may be run when the app is in a network-restricted
mode, like a form of doze. When this happens, jobs can timeout due to
lack of network access, causing a cascade of job delays. This is
particularly bad in the case of message retrieval.
To prevent this, if a job that normally requires network detects that no
network is available when running, then we start a foreground
notification.
Some devices will randomly throw RuntimeExceptions here due to hardware
issues. We were already doing broader catch statement in CameraView, so
I moved it here as well.
