https://qooah.com/2012/10/08/motorola-nexus-%e6%89%8b%e6%a9%9f%e8%a8%8a%e6%81%af%e6%9b%9d%e5%85%89%e4%b8%a6%e5%b0%87%e9%81%8b%e8%a1%8c-android-4-2/