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https://chromium.googlesource.com/android_tools/+/18728e9dd5dd66d4f5edf1b792e77e2b544a1cb0/sdk/sources/android-19/android/widget/RadioGroupPreCheckedTest.java
https://cells-source.cs.columbia.edu/plugins/gitiles/platform/frameworks/base/+/a6a0f6936379db483cbd21e821ed689460f57679%5E1..a6a0f6936379db483cbd21e821ed689460f57679/
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原文地址：http://my.oschina.net/u/855532/blog/359731
