Android WebDriver
http://code.google.com/p/selenium/wiki/AndroidDriver
Selenium官方支持的Android Driver
支持模拟器和真机
支持的平台：
The current apk will only work with Gingerbread (2.3.x), Honeycomb (3.x), Ice Cream Sandwich (4.0.x) and later.
Note that there is an emulator bug on Gingerbread that might cause WebDriver to crash.
The last version to support Froyo (2.2) is 2.16.
仅支持Web App
Selendroid
http://selendroid.io/
支持模拟器和真机
支持Native和Hybrid App
Multiple Android target API support (10 to 18)
Appium
http://appium.io
Android SDK API >= 17 (Additional features require 18)
支持模拟器和真机
支持native and hybrid mobile apps
Android support uses the UiAutomator framework for newer platforms and Selendroid for older Android platforms.
NativeDriver
http://code.google.com/p/nativedriver/wiki/GettingStartedAndroid
Android SDK 2.2 or later
nativedriver现在已经没人维护了，测试android的话nativedriver需要源代码中引入jar重新打包。
autoandroid
http://code.google.com/p/autoandroid/
This project is no longer being actively developed or maintained.