Don't forget to submit your ADC2 apps by midnight PST on Monday, August 31! Remember that this is Pacific time in the US (GMT - 7) so be sure to convert the deadline into your local timezone.
Also, even if you've already submitted your apps, please double check and make sure that your app is in the "Submitted" state in the UI! If it says "Unsubmitted", it will NOT be considered as an entry.
The time has come! The submission site for Android Developer Challenge 2 is now open. You can now submit applications for the Challenge at http://market.android.com/adc. Full instructions are also available on the site.
The key thing to remember is that all submissions must be entered by 11:59:59pm Pacific Time in the United States on August 31, 2009. If your applications are not submitted by that time, they won't be eligible for participation. Please carefully note what time that is in your local time zone.
It's very important that your apps only use published APIs. Some users might be judging your submissions on new phones you haven't seen or tested. If your apps depend on unpublished APIs, they might not work on some of these phones. Please note that you won't be able to submit new versions of your apps after the deadline!
Since you'll be competing against developers around the world for users' attention, it is important to focus on the fit and finish of your app. Your apps will be judged by users as a final product and not just a cool demo.
As a final note, if you've uploaded a version of your app to Android Market, you'll need to use a different Android package name for the version you submit to the Challenge.
I look forward to see all the great apps and innovations from you all.
Since the announcement of Android Developer Challenge 2 in May, Android phones continue to be deployed in countries worldwide. Android phones are currently available in over 20 countries, with more on the way. As I've mentioned earlier, we'll be including real-world users of these phones to help review and score your submissions. It is important to remember that your apps will be reviewed by judges around the world on actual devices; thus, be sure to make it extremely easy for users/judges to access your apps with minimum setup.
Some of you have been asking for clarifications on what we mean by "open only to applications that have not been published". To be specific, applications that are available on Android Market before August 1, 2009 will not be eligible to participate in the contest. Users have already been providing comments for apps that are currently available on Android Market, so it wouldn't make sense for them to "judge" the same apps again in this contest. In addition, apps that include or that are based on open source projects are fully welcomed, as long as the application itself is not on Android Market until August 1, 2009.
If you want to find out more details about ADC 2, you can find everything at the ADC 2 page along with the Terms and Conditions. For the moment, the most important thing to know is that ADC 2 submissions will be due August 31. I can't wait to see what you all come up with this time.
Happy coding -- and good luck!
Many of you have been asking for the ability to call into native code from your Android applications. I'm glad to announce that developers can now download the Android Native Development Kit from the Android developer site.
As you know, Android applications run in the Dalvik virtual machine. The NDK allows developers to implement parts of these applications using native-code languages such as C and C++. This can provide benefits to certain kinds of applications.
The NDK provides:
This release of the NDK supports the ARMv5TE machine instruction set and provides stable headers for:
Keep in mind that using the NDK will not be relevant for all Android applications. As a developer, you will need to balance its benefits against its drawbacks, which are numerous! Your application will be more complicated, have reduced compatibility, have no access to framework APIs, and be harder to debug. That said, some applications that have self-contained, CPU-intensive operations that don't allocate much memory may still benefit from increased performance and the ability to reuse existing code. Some examples are signal processing, intensive physics simulations, and some kinds of data processing.
For any questions on the NDK, please join the Android NDK forum.
Have fun.
For our third post in the series of Android UI, we're releasing Activity and Task Design Guidelines. This section of our guidelines aims to help you understand basic concepts of activities and tasks, how they work, and how to enrich the user experience you are creating.
We've packed a lot into this section, which is targeted at designers and developers. You'll see examples that will illustrate how to use our core principles and mechanisms, such as multitasking, activity reuse, intents, and the back stack.
Additionally, we are providing some best practices around our UI patterns such as notifications. For example, we'll show you how to design a notification so that it will take the user to the screen they expect. This behavior needs to be thought out, and doesn't necessarily just happen by default.
With helpful pointers to the API's and this documentation, we look forward to building your understanding of what it means to design and develop an Android UI.
I'm excited to announce the second Android Developer Challenge (ADC)! The first challenge was a huge success with over 1,700 entries that resulted in 50 excellent winners. With the recent release of Android 1.5, as well as the availability of devices in multiple markets around the world, I'm pleased to announce the second ADC.
We've expanded ADC 2 to involve a very important part of the Android community—the users who will be running these applications. Users of Android-powered devices with Android Market will be able to download a special Android judging application and use it to download and rank applications submitted to the Challenge. The results from this round will determine the top ranking applications in each of the 10 categories. These top applications will then be ranked by a combination of users and a panel of Google selected judges through a similar process as the first round to determine the final winners.
I've already seen a lot of great apps on Android and I look forward to seeing even more innovative and unexpected cool apps that will come out of this Challenge! For more details on ADC 2, please see the official site. Start your engines and good luck!
The Icon Design Guidelines document describes how to design and export icons that fit within the Android framework. It includes a wealth of detail about icons in the Home screen, menus, the status bar, tabs, dialogs, and lists.
The Android Icon Templates Pack is a collection of template designs, filters, and settings that make it easier for you to create icons that conform to the general specifications given in this Guidelines document. We recommend downloading the template pack archive before you get started with your icon design.
The Templates Pack provides templates in Adobe Photoshop and Adobe Illustrator file formats, which preserves the layers and design treatments we used when creating the standard icons for the Android platform. You can load the template files into any compatible image-editing program, although your ability to work directly with the layers and treatments may vary based on the program you are using.