https://qooah.com/2011/09/15/android-%e6%87%89%e7%94%a8%e7%a8%8b%e5%bc%8f-%e5%a4%a9%e6%b0%a3%e9%a1%9e-app-%e6%9c%80%e8%b3%ba%e9%8c%a2/