“Incorrect AVA format” when creating a signing key

incorrectAVAHave you ever run into the error “Incorrect AVA format” when trying to sign an Android APK with a new key? It turns out this useless error more than likely means that you have used some illegal character in the signing data. In my case, I had used a comma in the company name which isn’t allowed for some reason. Just remove any extra characters and you should be good to go!

Presenting tomorrow at BarCamp DC 3

Barcamp DC photo by jgarberI’m really excited about attending the third local BarCamp in DC tomorrow! Yep, we’re already on our third one here locally (not to mention all the others happening in the Baltimore-Washington D.C. area). I’m planning on co-presenting on Android development with Zvi Band. I’ll be showing a simple graphical app with animation and touch screen input.

I’m also using this opportunity to launch the first in a series of articles on Android development, gradually improving this simple app into something useable in a real app involving animations and graphics. Stay tuned, I’ll be posting the first article here sometime next week.

Android WVGA Support

I came across this interesting discussion yesterday regarding WVGA supporting coming in the Donut (1.6) version of Android OS. It looks like there will be a lot of work cut out for developers because we’ll need to support Cupcake (1.5) which is standardized on HVGA, and Donut which will now start supporting not only various resolutions, but also various screen densities. As developers, we’ll need to consider our layouts on various screens to make sure the look their best. Thankfully, there will be some built-in support for scaling layouts and images to ease the transition.

There is a blog post being written on the topic of different screen sizes, and we have gone through round after round of work on the underlying model of the platform and how to best explain the way this works, which is reflected in the doc.

As a side note, Al Sutton of AndAppStore.com has prepared a build of the 1.6 SDK and eclipse plugin to help test out the features coming in the next revision. We’ll need all the head start we can get to implement these new features. I’ve played around with this a bit, and like some of the new features coming to the eclipse plugin. I’ll write more about these later.