Using the Hardware Scaler for Performance and Efficiency
Posted by Hak Matsuda and Dirk Dougherty, Android Developer Relations team If you develop a performance-intensive 3D game, you’re always looking for ways to give users richer graphics, higher frame rates, and better responsiveness. You also want to conserve the user’s battery and keep the device from getting too warm during play. To help you optimize in all of these areas, consider taking advantag
Some SecureRandom Thoughts
Posted by Alex Klyubin, Android Security Engineer The Android security team has been investigating the root cause of the compromise of a bitcoin transaction that led to the update of multiple Bitcoin applications on August 11. We have now determined that applications which use the Java Cryptography Architecture (JCA) for key generation, signing, or random number generation may not receive cryptogr
ActionBarCompat and I/O 2013 App Source
Posted by Chris Banes, Android Developer Relations Following on the Android 4.3 and Nexus 7 announcements, we recently released two important tools to help you build beautiful apps that follow Android Design best practices: We released a new backward-compatible Action Bar implementation called ActionBarCompat that's part of the Support Library r18. The ActionBarCompat APIs let you build the essent
Google Play Developer 8-Step Checkup
Posted by Ellie Powers, Google Play team Google Play gives you tons of options on publishing your apps and connecting with users. But as you get started with new features like beta testing and staged rollouts, it’s a good idea to do a checkup and make sure you’ve covered the basics. 1. Boost your developer account security If you take just one step today to protect your Google Play apps, enable tw
Using Cryptography to Store Credentials Safely
Following our talk "Security and Privacy in Android Apps" at Google I/O last year, many people had specific questions about how to use cryptography in Android. Many of those revolved around which APIs to use for a specific purpose. Let's look at how to use cryptography to safely store user credentials, such as passwords and auth tokens, on local storage. An anti-pattern A common (but incorrect) pa
Getting Your App Ready for Jelly Bean and Nexus 7
[This post is by Nick Butcher, an Android engineer who notices small imperfections, and they annoy him.] We are pleased to announce that the full SDK for Android 4.1 is now available to developers and can be downloaded through your SDK Manager. You can now develop and publish applications against API level 16 using new Jelly Bean APIs. We are also releasing SDK Tools revision 20.0.1 and NDK revisi
Using DialogFragments
[This post is by David Chandler, Android Developer Advocate — Tim Bray] Honeycomb introduced Fragments to support reusing portions of UI and logic across multiple activities in an app. In parallel, the showDialog / dismissDialog methods in Activity are being deprecated in favor of DialogFragments. In this post, I’ll show how to use DialogFragments with the v4 support library (for backward compatib
How to have your (Cup)cake and eat it too
[This post is by Adam Powell, his second touchy-feely outing in just a few weeks. I asked him to send me a better picture than we ran last time, and got this in response. Photo by our own Romain Guy. — Tim Bray] Android developers concerned with targeting every last device with their apps are no doubt familiar with this chart: On July 1, 2010 this was the breakdown of active devices running differ
More Android Games that Play Nice
[This post is by Dan Galpin, who lives the Android Games lifestyle every day. — Tim Bray] Making a game on Android is easy. Making a great game for a mobile, multitasking, often multi-core, multi-purpose system like Android is trickier. Even the best developers frequently make mistakes in the way they interact with the Android system and with other applications — mistakes that don’t affect the qua
Making Android Games that Play Nice
[This post is by Ian Ni-Lewis, a Developer Advocate who devotes most of his time to making Android games more awesome. — Tim Bray] Making a game on Android is easy. Making a great game for a mobile, multitasking, often multi-core, multi-purpose system like Android is trickier. Even the best developers frequently make mistakes in the way they interact with the Android system and with other applicat
JNI Local Reference Changes in ICS
[This post is by Elliott Hughes, a Software Engineer on the Dalvik team. — Tim Bray] If you don’t write native code that uses JNI, you can stop reading now. If you do write native code that uses JNI, you really need to read this. What’s changing, and why?Every developer wants a good garbage collector. The best garbage collectors move objects around. This lets them offer very cheap allocation and b
Changes to Library Projects in Android SDK Tools, r14
Changes to Library Projects in Android SDK Tools, r14 Last week, we released the SDK for Android 4.0 and a new set of developer tools, now in revision 14. The updated tools include a lot of build changes, many that improve build performance. Also included is an under-the-hood change in how libraries are used by main projects — a first step in improving library support and code reusability. While t
Android’s HTTP Clients
[This post is by Jesse Wilson from the Dalvik team. —Tim Bray] Most network-connected Android apps will use HTTP to send and receive data. Android includes two HTTP clients: HttpURLConnection and Apache HTTP Client. Both support HTTPS, streaming uploads and downloads, configurable timeouts, IPv6 and connection pooling. Apache HTTP ClientDefaultHttpClient and its sibling AndroidHttpClient are exten
Multiple APK Support in Android Market
[This post is by Eric Chu, Android Developer Ecosystem. —Dirk Dougherty] At Google I/O we announced our plans to add several new capabilities to help developers manage their products more effectively in Android Market. We’re pleased to let you know that the latest of those, multiple APK support, is now available. Multiple APK support is a new publishing option in Android Market for those developer
Debugging Android JNI with CheckJNI
[This post is by Elliott Hughes, a Software Engineer on the Dalvik team — Tim Bray] Although most Android apps run entirely on top of Dalvik, some use the Android NDK to include native code using JNI. Native code is harder to get right than Dalvik code, and when you have a bug, it’s often a lot harder to find and fix it. Using JNI is inherently tricky (there’s precious little help from the type sy
Memory Analysis for Android Applications
[This post is by Patrick Dubroy, an Android engineer who writes about programming, usability, and interaction on his personal blog. — Tim Bray] The Dalvik runtime may be garbage-collected, but that doesn't mean you can ignore memory management. You should be especially mindful of memory usage on mobile devices, where memory is more constrained. In this article, we're going to take a look at some o
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