* Cleaned up text alignment styles for API < 17.
API v17 has a textAlignment style, wherease previous verisons rely on
the "gravity" property. This change includes gravity="center" where there
was previously only textAlignment="center".
* Fragments get added properly on 2.3 device.
For some reason, when adding the fragment to android.R.id.content, it
wouldn't work on my 2.3 device. This change includes a (almost) empty
activity layout with a single FrameLayout. The fragments are added to
this rather than "content", and it works better. It is not perfect - it
still adds the fargments behind the action bar, and so the action bar
appears blue. But at least they are there :)
* Added translatable strings where constants were used before.
Not related to v2.3 support, but stil important for a stable release,
that is fully translated.
Previously, a few people have been confused by an empty list when they first
open F-Droid (e.g. if they are not connected to the internet, and repos didn't
update). This provides some feedback so that there is never a blank screen.
Fixes Issue #34.
When adding repositories using the Manage Repos activity, firstly look
for an /index.jar appended on the URL provided by the user. If that
doesn't work (HTTP status code other than 200) then it will try
/fdroid/repo/index.jar, then /repo/index.jar. If it can't establish a
connection to the server, or if none of the above attempts results
in a 200, then the path provided by the user is kept (even though we
have a hunch it might be wrong).
This is to cover for the case where people arn't connected to the net.
Another way to deal with no internet connectivity is provided by a
"Skip" button on the dialog while searching for the index.jar.
The searching for index.jar is done by doing a HTTP HEAD request, so
the entire jar needn't be downloaded.
Finally, to make this happen in a clean sort of way, I refactored the
ManageReposActivity a little bit to encapsulate all of the add repo
dialog handling into a subclass. This way, the outer class doesn't
need to know things like: Is the dialog showing, what state is it in,
is the background task to search for index.jar files running, how and
when to cancel that task, etc.
