https://3c.yipee.cc/1229/google-io-2013-%e7%99%bc%e8%a1%a8%e6%9c%83%ef%bc%8candroid-%e5%8f%8a-google-play-%e7%ad%89%e7%9b%b8%e9%97%9c%e6%9b%b4%e6%96%b0%e9%87%8d%e9%bb%9e%e5%9c%96%e6%96%87%e7%b2%be%e8%8f%af%e6%95%b4%e7%90%86/