https://qooah.com/2012/04/01/%e5%a0%b1%e5%91%8a%e9%a1%af%e7%a4%ba-android-%e7%94%a8%e6%88%b6%e5%9c%a8%e8%b2%b7-app-%e4%b8%8a%e7%9a%84%e8%8a%b1%e8%b2%bb%e6%9c%80%e4%bd%8e-2/