https://qooah.com/2012/12/05/%e6%88%96%e5%b0%87%e6%8a%95%e8%b3%872000%e8%90%ac%e7%be%8e%e5%85%83-%e6%8b%af%e6%95%91%e9%a3%bd%e5%8f%97%e9%bb%91%e5%ae%a2%e8%a5%b2%e6%93%8a%e7%9a%84-android-%e8%a8%ad%e5%82%99%ef%bc%81/