Android library is functionally complete as of last time I worked on it, though I haven't been able to work on it since and so is missing unit tests still and you have to build from source. There was one person doing something with it but only a couple of aspects and I don't remember what they were, nor do I know if he ever finished. Karl could probably look at logs to see perhaps based on user-agent. It's been a while since I worked on it, so there may be new functionality in the c# driver that is not there in the android driver, which perhaps include breaking changes that perhaps break the android implementation.
The library only does the interaction with mogade, it knows nothing of the UI. I had plans to wrap each of the individual actions like getting ranks and such into AsyncTask's that would make your general UI usage easier, but I don't know if I ever got back to them and finished them. These tasks merely wrap the around interaction with the driver, so there isn't anything stopping you from doing that on your own.
I'll add some sample usage to the github wiki for android tonight, and then reply here with the info, but the pseudo code to do it is this:
1. Use MogadeConfiguration to override url / version (if necessary)
2. Create a DriverImpl (default implementation of Driver interface) with the gameKey and optionally secret (for operations that require secret)
3. Use the method for the info you want, it will return a Response<T> object
4. Check the response to see if it has an error, or use the data that was returned if it was successful.
Step 4 is synchronous, which is why I was going to make an AsyncTask implementation for each operation just so the developer using the library wouldn't need to, but it's pretty simple to put that into your own async task. Once you have the response, you would then interact with your UI to display the information.
If you are new to android, then what I said probably needs a bit more explanation. AsyncTask is a utility class in android that basically executes the code you provide on a thread and it does all the marshaling of the calls between background thread and UI thread for you (mostly). So for steps 1-4 you would put into the doInBackground method of the AsyncTask, and then store the result, then override the onPostExecute and use the result to update the UI.
Here are some links to help you get started: