https://qooah.com/2012/11/04/google-nexus-%e6%97%97%e4%b8%8b-android-%e8%a8%ad%e5%82%99%e7%9f%ad%e6%9c%9f%e5%85%a7%e7%8d%b2%e5%8d%87%e4%b8%8a-android-4-2-%e7%b3%bb%e7%b5%b1/