https://qooah.com/2012/07/05/%e8%aa%bf%e6%9f%a5%e9%a1%af%e7%a4%ba-2012-%e4%b8%8a%e5%8d%8a%e5%b9%b4-android-%e6%83%a1%e6%84%8f%e8%bb%9f%e4%bb%b6%e6%95%b8%e9%87%8f%e6%bf%80%e5%a2%9e-4-%e5%80%8d/