Android问题收集

1. What is the difference between instanceof and Class.isAssignableFrom(Class c)? answer : When using instanceof, you need to know the class of B at compile time. When using isAssignableFrom() it can be dynamic and change during runtime.

2. Android存储器中mkdir或mkdirs一直返回false问题，找到一个非常好的解决方案

3. 小米手机调试。

   • 手机通过USB线连接电脑并打开了USB调试模式；
   • 在开发者选项中打开“Install via USB”选项，给予系统通过USB安装的权限。否则一直报错： “INSTALL_CANCELED_BY_USER”