https://qooah.com/2012/05/15/%e9%a6%96%e6%ac%be-tizen-%e5%b9%b3%e6%9d%bf%e9%9b%bb%e8%85%a6%e5%b7%b2%e5%ae%8c%e7%be%8e%e6%94%af%e6%8f%b4-android-%e6%87%89%e7%94%a8%e7%a8%8b%e5%bc%8f/