Will also appear as indeterminate if:
* The repo being downloaded from doesn't send a Content-Length header.
* While connecting to the HTTP server to begin downloading.
Right now it says "50%" always, will need to think whether to ditch the
percentage completely, or to have the temp app/apk providers emit progress
events some how too.
Although not used by the temp provider, it seemed strange having some of
the code always using the `DBHelper.TABLE_APP` and other code using
`getTableName()` where all of it could have used `getTableName()`.
Also moved commiting of the temp tables to the real tables into the
`RepoPersiter` instead of in `RepoUpdater`.
The repo xml handler now has a different mechanism for returning
data about the parsed xml file. This is done via a callback, rather
than storing the data in member variables. The tests now deal with
this correctly.
The update/delete operations of the TempAp[pk]Provider's didn't
work, so that has now been fixed.
At the start of a repo update, it will create a copy of the apk table.
Throughout the update, it will query the original apk table for info.
All inserts and updates happen to the temp table. After the repo has been
verified as trusted, the original apk table is emptied, and all apks are
copied from the temp table to the real one.
I realise that the work done to query the apk table for info during the update
could happen against the temp table, but it was not neccesary to move all of
the queries that are required for this task to the temp apk provider.
Refactored repo update to stream apks from network -> jar file reader ->
xml parser -> database. No longer build up large lists of app metadata
to save. Saves memory, but is MUCH slower.
Does sig verification properly, but does it at the END of the process
and DOESN'T ROLL BACK on failure.
Quick and dirty benchmarks show an increase in time from ~25 seconds
to ~30 seconds on my Nexus 4 with Android 5.0. This doesn't seem so
bad to me, for the tradeoff that people on low end devices can actually
update now.
Also, as @eighthave pointed out, if we are able to stream the download
directly from the internet, then that time will drop to essentially
the time it takes to download the index.
Improved support for HTTP Basic Authentication
Extended DownloaderFactory to support optional username & password parameters.
Extended HttpDownloader to check for HTTP 401 Authorization Required status code
and send a simple HTTP Basic Authentication header with all requests.
Extended ManageReposActivity to support repositories that use HTTP Basic
Authentication, added a dialog to prompt for username and password.
Extended RepoDetailsActivity to be able to display and modify the authentication
credentials.
See merge request !171
