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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.

官方关于android sdk各个版本的兼容性建议，正如官方建议的："Testing is key"

ICS-centric design 的开源Library

想到就悶 官方擴充套件既然要主推Action Bar pre3.0還要去找第3方套件。 雖然後來他們也有出Action Bar compatibility， 但真的是不好用。

Google Android在Design方面一直是一个赶超者，直到ICS才多少得到些尊重。这才名正言顺的出了一系列"范式"。 在此之前，都是依赖开源社区的"试探性"的尝试，这些尝试"是否能用"尚且还是个未知数，就更别说"是否好用"了。 终于Android开始要'统一江湖'了，积极的第三方开发者也开始认可'统一'的方向，这是件好事. ICS的设计很优雅，更重要的是官方多次突出强调与iOS的区别，这让我很有归属感 :)