Whether you have a bug fix, enhancement or performance optimization that you want to deliver to your customers, one of your Android apps will inevitably require an upgrade. This can be either a seamless process or a painful one for your customers. To ensure that it is the former and not the latter, the Android SDK provides some simple guidelines to help you manage this process. Last week, we discussed some useful configuration settings offered through AndroidManifest.xml for designing apps to run on smartphones and tablets. This same configuration file also provides settings to version your apk.
There are two attributes you can specify to manage the versioning process of your app:
The versionName attribute is a user facing string that identifies the version of the application in use. For example, if you are upgrading for the first time, your previous versionName may be “1.0” while a minor upgrade version would be indicated by “1.1” and a major upgrade by “2.0”. The versionName attribute is primarily used for display purposes and helps users identify differences between app versions. The following is a snippet of the manifest from the Amazon MP3 App for Android:
The versionCode is the attribute that is used by the Amazon Appstore for Android to compare versions of your app. This is an integer, like 80029 in the sample manifest, not a string like the versionName. If the versionCode of an apk is greater than the versionCode of another apk, then it is considered to be newer. Of course, for this comparison to be valid, the apk package name and signature must also match. To avoid unexpected behavior, it is extremely important to keep track of your versionCode and to always increase the value whenever you are releasing a new version.
It’s well known that Amazon is all about customer experience. With a growing developer customer-base, we’re constantly striving to make it easier for developers to do just that – develop! Last month, we launched an Amazon Web Services (AWS) SDK for Android. “We’re really excited about the launch of the AWS SDK’s for mobile,” says Jeff Barr, Senior Web Services Evangelist, Amazon Web Services. “As a developer myself, I’m looking forward to seeing all sorts of cool and creative AWS-powered applications show up on mobile devices in the future.”
Some highlights of the AWS SDK for Android include:
The SDK includes a library, full documentation, and some sample code. You can get the library on GitHub. Also, in true open source fashion, AWS is open to and encourages external contributions.
Check out this blog post on the AWS blog for more details about the AWS SDK as well as an iOS SDK. You can download the AWS SDK, access documentation, and participate in the discussion forum online here.
Finally, right now Amazon has a free usage tier available to new AWS customers to help get started in the cloud. As of November 1, 2010, new customers can run a free Amazon EC2 Micro Instance for a year, while also leveraging a new free usage tier for Amazon S3, Amazon Elastic Block Store, Amazon Elastic Load Balancing, and AWS data transfer. AWS’s free usage tier can be used for anything you want to run in the cloud: launch new applications, test existing applications in the cloud, or simply gain hands-on experience with AWS. Learn more here.
At last week’s CES, it was hard to ignore the fact that many technology pundits are considering 2011 as the year of the tablet. And although Apple should be thanked for resurrecting interest in tablets in 2010, 2011 will see a record breaking surge in the number of vendors bringing new tablets to market. Sean Dubravac, Chief Economist and Director of Research, Consumer Electronics Association, predicted, “While many firms are touting product launches within the tablet sphere for the fourth quarter of 2010, the real action will occur a few weeks after the end of the quarter at CES.” The next few weeks will be telling for the future of the tablet and so far it’s looking quite bright.
The good news for you, the Android developer, is that many of these tablets will be sporting Android OS and, with the recent announcement of the Amazon Appstore Developer Portal, you have a convenient way of offering your apps to both tablet and smartphone users. We’re not mandating that you optimize your apps for tablets as well as smartphones, but it’s definitely something you should consider.
The expected surge in the number of tablets on the market and the number of Android devices a single user will own brings forth new opportunities and challenges. The opportunities are clear—more devices mean more users, more hardware features and more APIs to take advantage of. These new tablets will continue to feature larger screens and supported resolution levels, ample amounts of disk space and extremely fast processer speeds that are not far behind that of a typical laptop. An important thing to remember as a developer is that customers may be using your app across tablets and smartphones – no longer just one or the other.
A quick comparison of the best selling smartphones and tablets on Amazon.com shows that tablets boast 50-100% more screen real-estate and 50% more disk space. Furthermore, many of the tablets demonstrated at CES also feature dual-core CPUs. These differences make it more important than ever for developers to be aware of the device capabilities and limitations. With Amazon.com’s convenient 1-Click purchase and digital locker features, customers will be able to buy your apps and run it on any of their Android devices. Unfortunately, the growth in devices will present one of the biggest challenges for you—you want to continue to build and extend your killer apps and offer it to the tens of millions of Amazon.com customers, but you also want to keep your customers happy by setting expectations on how and where the apps can be run.
The Android SDK requires that each application contain a file called AndroidManifest.xml within the apk. This is where you can let the system know what your app needs at a minimum to run and what resources and services it will use. For instance, if you are building a word processor app that is designed to only run on a tablet, you will want to set the android:largeScreens attribute to “true” on the <supports-screens> property, while explicitly setting the small and normal screen flags to false. If you don’t declare this requirement for your app, then the Android system will assume it works on all screen sizes.
On the other hand, if you are building a game that looks great on any phone or tablet, then you can declare this in the xml file by including the following settings:
One thing to be aware of, however, is that once you declare support for all screen sizes, you will want to check the DisplayMetrics settings at runtime to make important display decisions in your code. This information can be used to make performance optimizations, such as displaying low to medium resolution images on small devices and high resolution images on large screens—a great way to avoid creating multiple versions of your app.
Apps that depend on hardware resources, such as GPS, Wi-Fi or Bluetooth capabilities, can define these requirements by appropriately setting the <uses-features> option.
Furthermore, with last month’s announcement of the Gingerbread release, there are now 6 flavors of Android OS in use. If the trend over the past two years continues, you can expect one more major release (3.0, Honeycomb) and another minor release to be announced before 2012. With major features being added in every new platform version, such as improved copy-and-paste and faster text input processing in Gingerbread, you will want to take advantage of these capabilities and also ensure your apps only run under their supported environment. The manifest provides a way to enforce dependencies on specific SDK features by using the <uses-sdk> flag.
Customer satisfaction is a key driver behind Amazon.com’s success. As you develop and offer your application to Amazon.com’s customers, following these Android development best practices guidelines is a great start towards achieving similar success.
You’ve taken the first step in submitting an app to the Amazon Appstore – you’ve created a compelling app or game for Android! Either that or you’re reading this post to learn more about what’s to come in the store itself – we understand, it’s exciting. Regardless – if you’re an app developer or you’re just plain old curious, we’ll bottom line the submission process for you. It’s straight forward – you did the hard work and we want to make submitting to the store easy.
There are three steps to getting your app into the Amazon Appstore for Android: create an account, submit your app, and make your app available.
The first step is creating an account. This is the easy part – you can create an account directly on the Amazon Appstore Developer Portal.
For a limited time, we’re waiving the $99 program fee to make getting started even easier (or at least cheaper … free)
. It’s free to register for a developer account. Go to the Amazon Appstore Developer Portal to create your account.
You’ll be asked for the following information:
After setting up your account, you’ll need to submit your apk file as well as marketing materials that complement your app. Marketing materials include details about your app, images, and video.
We will ask for the following details about your app:
You can find out more about what’s specifically required for images and video online here. It’s important that the images and video you submit are yours (you have the rights to use these images and video) and that they’re reflective of the app itself. An image with some upset birds for a finance app that helps with taxes wouldn’t do anyone any good.
That’s it – after you open up your account and submit your assets you’re app and details will be in review. You can track the approval status of your app at any time by logging into the Developer Portal and finding your app in the “Dashboard” on the portal home page.
You may have seen the buzz in Android blogs and forums about Amazon doing something… appy! Today Amazon.com launched the Amazon Appstore Developer Portal. You can find the Portal at developer.amazon.com. It is a new self-service tool that allows mobile application developers—Android developers in particular—to join our Appstore Developer Program and submit apps for the upcoming launch of the Amazon Appstore for Android.
At Amazon, we start with the customer and work backwards, and we’re always looking for ways to improve the customer experience. The sheer number of apps available today makes it hard for customers to find high-quality, relevant products – and developers similarly struggle to get their apps noticed. Amazon’s innovative marketing and merchandising features are designed to help customers find and discover relevant products from our vast selection, and we’re excited to apply those capabilities to the apps market segment.
Our customers also have a strong interest in mobile, and across the company we are working hard to make our great products and services available on mobile devices. We continue to innovate the mobile shopping experience with the Amazon Shopping app, Amazon Price Check and the recently launched Windowshop for the iPad. We have numerous Kindle apps, and customers can shop our MP3 store from their mobile devices. Our subsidiaries like IMDB and Audible also have robust mobile applications. An Appstore is a logical next step for Amazon in mobile.
Why should you submit your apps for inclusion in the Amazon Appstore for Android?
The Appstore Developer Portal is your one-stop location to manage account details, manage marketing materials, and track sales and projected earnings using self-service and customizable reports. We encourage you to check out the Portal at developer.amazon.com and join the Appstore Developer Program today!
- The Amazon Appstore Team