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Android 3.2 includes new tools for supporting devices with a wide range of screen sizes. One important result is better support for a new size of screen; what is typically called a "7-inch" tablet. This release also offers several new APIs to simplify developers' work in adjusting to different screen sizes.

This a long post. We start by discussing the why and how of Android "dp" arithmetic, and the finer points of the screen-size buckets. If you know all that stuff, you can skip down to "Introducing Numeric Selectors" to read about what's new. We also provide our recommendations for how you can do layout selection in apps targeted at Android 3.2 and higher in a way that should allow you to support the maximum number of device geometries with the minimum amount of effort.



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