In Android 6.0 Marshmallow, application will not be granted any permission at installation time. Instead, application has to ask user for a permission one-by-one at runtime only if application target level is 23.
在Android 6的棉花糖，申请将不被授予任何许可，在安装时。相反，应用程序必须在运行时向用户请求一个权限，只有当应用程序目标级别为23时。
23降低为22后即可
原文：http://www.cnblogs.com/newcaoguo/p/5876494.html