https://qooah.com/2013/11/27/android-4-4-%e6%94%af%e6%8f%b4%e4%bd%8e%e9%9a%8e%e6%89%8b%e6%a9%9f%e5%88%b0%e5%ba%95%e6%9c%89%e5%a4%9a%e4%bd%8e%e5%91%a2%ef%bc%9f/