DownloaderService is structured to be as simple as possible, and as tightly
matched to the downloading lifecycle as possible, with a single queue for
all requests to avoid downloads competing for bandwidth. This does not
represent the possibilities of the whole install process. For example,
downloading can happen in parallel with checking the cache, and if an APK
is fully cached, there is no need for it to go through the DownloaderService
queue.
This also lays the groundwork towards simplifying DownloaderService even
more, by moving the Notification handling to InstallManagerService. That
will provide a single place to manage all aspects of the Notifications that
has a lifecycle that is longer than the Notifications, unlike an Activity
or DownloaderService.
Having the notification as its own Service is overkill and really only
serves to increase complexity. The notification stuff should not take much
time or resources at all.
This moves the cache file deletion to a dedicated IntentService that runs
at the lowest possible priority. The cache cleanup does not need to happen
with any kind of priority, so it shouldn't delay the app start or take any
resources away from foreground processes.
This also changes the logic around the "Cache packages" preference. The
downloader always saves APKs, then if "Cache packages" is disabled, those
APKs are deleted when they are older than an hour.
This also simplifies Utils.deleteFiles() since the endswith arg is no
longer needed.
Fixes for priv extension install
For now, disable install of privileged extension on Android >=5.1 until we found better methods.
Also, fix crash of dialogs on Android 6 using a workaround for transparent activities and some code simplifications.
See merge request !259
DownloaderService is based on IntentService to provide queued requests that
run in a background thread via the Handler and the HandlerThread. It began
as the IntentService code, but it could not be a subclass because the
downloading needs to be cancelable. IntentServices cannot be canceled and
they provide no visibility into their queue.
DownloaderService then announces relevant events via LocalBroadcastManager
and Intents with custom "action" Strings.
https://gitlab.com/fdroid/fdroidclient/issues/601#601
Unfortunately, this approach did not really work out. It would have been
really nice to rely on the provided DownloadManager stuff, but it has too
many issues, like not working with Tor or other proxies, and being
difficult to tightly integrate.
This makes it a lot easier to setup all the testing stuff. Mostly,
I'm tired of fighting Android Studio's fragility, so I want to remove
as much non-standardness as possible in the hopes of improving that
situation.
closes#534https://gitlab.com/fdroid/fdroidclient/issues/534
