Android默认应用是没有任何权限去操作其他应用或系统相关特性的，应用在进行某些操作时都需要显式地去申请相应的权限。一般以下动作时都需要申请相应的权限：A particular permission may be enforced at a number of places during your program's operation: ?At the time of a call into the system, to prevent an application from executing certain functions.?When starting an activity, to prevent a...
