https://qooah.com/2012/11/07/%e6%a0%b9%e6%93%9a%e5%a4%96%e5%9c%8b%e7%b5%b1%e8%a8%88%ef%bc%8candroid-%e5%9c%a8%e5%8d%81%e9%80%b1%e5%b9%b4%e6%99%82%e8%a8%ad%e5%82%99%e6%95%b8%e9%87%8f%e5%b0%87%e8%b6%85%e8%b6%8a%e5%9c%b0%e7%90%83/