https://qooah.com/2011/06/29/%e5%a4%8f%e5%ad%a3%e7%89%b9%e5%88%a5%e7%89%88-android-%e5%85%ac%e4%bb%94%e8%81%96%e5%9c%b0%e7%89%99%e5%93%a5%e5%b1%95%e5%87%ba/