It is not required that you have a physical device; all of the code in this article will run fine on the Android emulator that comes with the SDK.
物理设备不是必须的；本文中的所有代码在SDK附带的Android模拟器上可以很好的运行。
Google provides an Android emulator with their SDK, which is designed to let developers test their apps on Android before running them on handsets.
Google在他们的SDK里面提供了一个Android模拟器，这个模拟器是用来让开发者们在发布应用前进行测试的。
Google provides an Android emulator with their SDK, which is designed to let developers test their apps on Android before running them on handsets.
Google在他们的SDK里面提供了一个Android模拟器，这个模拟器是用来让开发者们在发布应用前进行测试的。
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