Google offers a package of the Android support Library packages to ensure backward compatibility for high-version SDK development , That is, when we use 4.x development, in 1.6 and other versions, you can use a high version of some features, such as Fragement,viewpager, below, a brief description of the differences between these several versions:
Android SUPPORTV4: This package is designed to take care of 1.6 and later versions , this package is the most widely used, Eclipse new project, when the default comes with.
Androidsupport V7: This package is designed to consider the care of 2.1 and above, but does not include the lower , so if you do not consider 1.6, we can add this package, also note thatV7 is to rely on V4 This package, that is, Two must be included at the same time .
Androidsupport V13: This package is designed to android3.2 and later, generally we are not used, flat-panel development can be used.
Android support; The difference between V4, V7, V13