https://developer.android.com/training/basics/network-ops/connecting
若要在您的应用中执行网络操作，您的清单必须包含以下权限

uses-permission android:name="android.permission.INTERNET"
uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"

Operation not permitted (os error 1)
Permission denied (os error 13)

如果不声明，udp bind就会报错