https://qooah.com/2014/06/06/nexus-8-%e7%9c%9f%e6%a9%9f%e5%9c%96%e6%9b%9d%e5%85%89%e9%ab%98%e9%80%9a-64-bit-%e8%99%95%e7%90%86%e5%99%a8-android-4-5/