https://qooah.com/2013/07/05/%e5%85%a7%e5%9c%b0%e5%93%81%e7%89%8c-oppo-%e4%b9%9f%e8%a8%88%e5%8a%83%e6%8e%a8%e5%87%ba-android-%e6%99%ba%e8%83%bd%e7%9b%b8%e6%a9%9f/