https://qooah.com/2012/09/21/nec-%e6%8e%a8%e5%87%ba%e5%85%a8%e7%90%83%e6%9c%80%e8%bc%95-7-%e5%90%8b-android-%e5%b9%b3%e6%9d%bf%e9%9b%bb%e8%85%a6/