https://qooah.com/2012/09/28/android-%e7%89%88-youtube-%e8%bf%8e%e4%be%86%e6%9b%b4%e6%96%b0%ef%bc%8c%e6%94%af%e6%8f%b4%e5%b0%8d%e8%88%8a%e7%b3%bb%e7%b5%b1-gingerbread-%e6%88%96-froyo-%e7%9a%84%e6%94%af%e6%8c%81/