https://qooah.com/2011/02/01/%e6%b2%92%e6%9c%89%e8%be%a6%e4%b8%8d%e5%88%b0%e7%9a%84%e4%ba%8b%ef%bc%8c%e7%ac%ac%e4%b8%80%e5%b0%b1%e6%98%af%e4%bd%a0%ef%b9%97android-%e6%89%8b%e6%a9%9f%e9%8a%b7%e5%94%ae%e9%87%8f%e6%ad%a3%e5%bc%8f/