https://qooah.com/2011/11/13/%e6%9c%89%e5%82%b3-yahoo-%e6%98%8e%e5%b9%b4%e8%a8%88%e5%8a%83%e5%9c%a8%e6%97%a5%e6%9c%ac%e6%8e%a8%e5%87%ba-android-apps-market/