https://qooah.com/2012/10/01/%e6%83%b3%e6%89%93%e9%80%a0%e4%b8%80%e5%80%8b%e7%8d%a8%e4%b8%80%e7%84%a1%e4%ba%8c%e7%9a%84-android-%e5%85%ac%e4%bb%94%e6%a8%a1%e5%9e%8b/