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"Fragmentation matters to the entire Android community: users, developers, OEMs, brands & networks. It's a blessing and a curse. The Blessing. Fragmentation allows users to take their pick from thousands of devices. You can choose from phones with 3D screens, projectors, CDMA, GSM, or even CDMA & GSM. You may not care that Tag Heuer has made an Android phone but at least one person does (and they use OpenSignalMaps). It's a triumph for Android that as a single OS it can target so many markets. The Curse. The proliferation of devices with their associated screen sizes, internal hardware and custom ROMs creates some difficulties. We spend a lot of time making the app presentable (or at less functional) on exotic devices - this is the most common request we get from app users"

Holo Everywhere is an android library /extension to be able to use Holo theme on older android devices as well 

Android, a rich platform for application development, has an attractive set of user interface elements and data-management capabilities. Android also offers a healthy array of interfacing options. In this article, learn how to interact with Android's varied sensor options to monitor your environment. Sample code shows you how to record audio on an Android phone. Want to build your own baby monitor? Unlock your phone or a door with your own voice activation? Learn how to leverage the hardware capabilities of an Android-equipped device.

The other big security enhancement introduced in Android 4.3 is a more robust way to store cryptographic credentials used to access sensitive information and resources. This means changes to the Android KeyChain, which stores digital certificates used to access Wi-Fi networks and virtual private networks used by large corporations and government agencies. With the keychain enhancements, the system-wide keys are bound to a hardware-based root of trust process devices that support this.The phone needs to have a secure element such as a Trusted Platform Module so that private keys can't be stolen even if the phone is rooted and the attacker has full access to the operating system. Phones that don't have this hardware capability will fall back to software protections for securing credentials.Enhancements to the Android Keystore, a similar resource that also stores credentials, allows users to create keys that can be accessed and used exclusively by a single application. Under version 4.3, "apps can create or store private keys that cannot be seen or used by other apps and can be added to the keystore without any user interaction A third enhancement is Android's ability to create secondary user profiles that implement fine-grained restrictions.

For a library to be compatible with Android, it can only reference classes available as part of Android and other classes implemented specifically in the library itself.Android Libraries can contain Java classes, resources, and other project information, but not assets. They can reference other libraries and leverage third party JAR files. They have Android manifest files just like regular Android projects. However, they differ from normal Android projects in an important way: they cannot be compiled into their own application packages or deployed onto devices. They can also not be exported as standalone JAR files. Once referenced from an Android project, the library components are incorporated into the Android application that references them at build time and added to the application package. There is no need to declare the component as the library classes are rolled into the APK directly. In terms of compatibility, the Android project must have an API Level higher than or equal to the API Level set in the Android library.

"This library provides a version of GridLayout that works across all versions of Android 1.5+. As a side effect, this library also includes the lightweight Space as well."

总是有这类比较Froyo和其他OS渲染JS性能的评测，难道是Google在鼓励更多web app运行在android浏览器下？