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Tech Life of Recht » archive for 'android'

 More on Andronos

  • January 29th, 2010
  • 12:29 am

14 releases later, and Andronos (my Sonos controller for Android) is actually looking pretty good. My 1337 gui skills have been at work, and in my own opinion, the application has been styled somewhat nicely. Basic functionality is present:

  • Detect and list available zones
  • Group zones together
  • Stop/play/next/previous
  • Playlist management
  • Browse music
  • Browse radio stations
  • Volume control, both individual and group volume

I’ve also managed to add some more special features:

  • Quickplay list – I use it for starting my favorite radio without having to navigate the browsing structure
  • Indexing and freetext search
  • integration – covers are fetched automatically if none existed locally, and extra info (tags and play count) can be retrieved. Also, it’s possible to love a song using

All the features of the regular controller which I normally use are done, so I’m more or less ready to drop my iPhone. Now begins the hard part of adding new valuable features – most of them are not particularly easy to implement:

  • Faster – the Android platform is pretty nice to work with, but Andronos is not exactly as fast as the native controller. Caching can add some performance, but in the end, I’ll probably have to do some pretty low-level optimizations all over the place
  • Cover browsing – it should be possible to browse the music archive based on a list of covers
  • Rhapsody and Pandora – probably not hard to do, but neither of the two are available in Denmark. Help is appreciated here – I don’t quite know how yet, but if you’re interested, please contact me.
  • Dynamic playlists – Andronos should be able to dynamically create playlists based for example on loved songs, previously played songs, and so on. Also, it should be able to select music based on a general category (party, relaxing, cooking, whatever)

I’ll probably think of more features to add, but it should be enough for now – there should also be something left for Sonos to do when they get around to making a supported controller for Android.

And then to something a little different, but related. Someone asked me today if I had an opinion of mobile development with Android. Having worked with Android for a couple of my pet projects, there are some things I’ve noticed, and here are some of them, in no particular order. Hopefully, I’ll get time to elaborate on them later on.

  • As a Java programmer, nothing really beats having your normal environment, in my case Eclipse, and all the standard libraries. Need UPnP? Download a library. Need integration? Download a library. Need raw network access? Download a library using JNI. (in the last case, be prepared to fiddle around with Make-ish files, but it can be done). No need to learn a new language or new basic tools, you just have to learn a new API.
  • It can be a little hard to drop all the fancy patterns and design principles, but it’s often necessary to get acceptable performance. Object allocation and garbage collection is pretty expensive, which is the complete opposite of the regular Java VM, so you have to be careful, and that can hurt in a number of ways (think maintainability, API design, testability)
  • The declarative UI approach works pretty well, but the Eclipse plugin does a pretty bad job of rendering the UI, so in most cases, you have to fire up the app on either an emulator or a phone to get a real look at the UI. A simple thing: Why are styles not rendered in the plugin?
  • The UI does have a number of bugs and undocumented features. Drawables are probably the worst I’ve met. They can be defined in XML, and can be used for eg background gradients, button borders, and much more, but they are truly trial-and-error
  • Android Market works pretty nicely, in principle, at least. I wouldn’t have been able to create Andronos if I’d had a turnaround time of a month for each release. Of course, Andronos is a little special, because Sonos systems can be configured in so many different ways, and I do not have one of each player model, but still. Being able to get a bug report, fix the bug, and release a new version in a matter of 10 minutes is pretty cool.
  • A couple of things about Android Market, though: Why can’t I see the comments in a regular browser, and why can’t I reply to the comments?
  • Fortunately, Andronos is pretty flexible in the layout, so it runs without any serious problems on both small and large screens. However, this can easily become a problem if you haven’t defined the UI in device-independent units, and even then, you might be forced to having different layouts for different devices. I’m guessing Apple will have to cope with this too, now that the iTablet (I forgot its name) is out
  • I can see why root access is something you don’t want to give out to everybody, but couldn’t there be some way of getting partial root access? For example, if I want to send an ICMP packet, I need write access to the network device, but I can’t get that. Why?
  • Error handling could be better when an application crashes. I’ve installed a custom exception handler which emails me stack traces, but couldn’t this just be built-in?
  • The Android API itself is at points somewhat strange. Why do I sometimes need to bitwise add flags to a component? Why must I always remember to call super? Most of the time, it’s just like doing Swing, and I can live with that. The API could be more “modern”, however, and not use inheritance quite as much as it does.
  • Testing isn’t as easy as it could have been (and with Andronos, it’s even harder, because most functionality only makes sense when connected to a Sonos device), but that’s at least in part because GUI testing has never been easy. Just learn to separate UI logic from “business” logic, and then the business logic can be tested as you would normally do it.
  • Most importantly, and this outweighs any disadvantages Android might have: The platform is open, there’s an active community, there’s lot of open source, and you’re not forced into anything

That’s it for now. And no new releases tonight (but that’s probably just because I’ve been musically cultural tonight).

 Andronos, Sonos remote control for Android

  • January 10th, 2010
  • 11:16 pm

Lately, I’ve been working on my first real project for Android, a remote control for my Sonos system, so that I can finally get rid of my iPhone (which I am only using for that purpose).

This has been quite a learning experience, both in regard to Android and Sonos – Sonos is controlled using UPNP, so now I probably know much more about that than I’d ever want to. However, it seems to have paid off, because I finally have something that works, at least somewhat. Performance isn’t great, and some features are still missing, but that should all be fixable.

My plans are to build some extra support into the remote control, so that it can, for example, generate queues based on track popularity, display album/artist/track info, and much more. Already, album covers are retrieved from (I’ll probably change this so it checks the Sonos system first, at some point).

The features implemented now are: basic playback control (previous, next, play, pause), mute/unmute, volume control, adding/removing from queue, and browse available music. Most important missing feature is probably zone management, but hopefully, I’ll get time to fix that soon. Also, internet radio isn’t working, and it seems that you cannot change from radio to regular playlist.

The application is available on Android Market under the name Andronos, so if you own an Android phone and a Sonos system, please try it out. Any bugs or suggestions can be reported on the Google Code site. If you’re really ambitious, I’m also accepting patches (the project is open source, after all). The code is hosted at Gitorious, so just go ahead and check it out.

 The Google Experience

  • June 2nd, 2009
  • 10:33 pm

One week in San Francisco is over, and I’m slightly jetlagged. However, it was a nice little trip, and the Google I/O conference was actually pretty good. I’d feared that it would turn out to be a complete fanboy conference, but luckily it wasn’t that bad, and most of the talks I went to were of pretty high quality. I mostly went to the GWT talks about the upcoming features in 2.0, and how to structure large GWT applications.
As most people know by now, the conference wasn’t entirely without hype. First, there was the Google Android phone giveaway, which I must admit was pretty sweet. I’d thought about buying an Andriod-based phone, so getting a free one couldn’t be any better – especially because it came with a 1 month subscription and in unlocked condition. I’m still getting used to the phone, but I like it more than my iPhone – probably mostly because I’m not tied in to the 2nd evil empire.

The second hype-event was the Google Wave presentation. Also some pretty sweet stuff, especially considering that it was all a web application based on GWT. Time will tell if Google Wave will live up to the quite large amount of applause given at the presentation, but it seems like it has the potential to have quite an impact. I’m certainly looking forward to getting access to the sandbox environment, and even more to getting a look at the source code when it becomes available.

The conference was only two days, so there was time for some sightseeing and shopping. Just in case anybody else doesn’t know it: Playstation 3 games for region 1 (USA) can be played on a region 2 device (EU). Oh, and if you rent a convertible, you should probably consider putting on some sunlotion before driving around the entire day with the roof off.