Android6.0之后新增加了网络能力的标识类：NetworkCapabilities.java

路径:frameworks/base/core/java/android/net/NetworkCapabilities.java

public boolean hasCapability(int capability) {         if (capability < MIN_NET_CAPABILITY || capability > MAX_NET_CAPABILITY) {             return false;         }         return ((mNetworkCapabilities & (1 MAX_NET_CAPABILITY) {                    throw new IllegalArgumentException("NetworkCapability out of range");          }           mNetworkCapabilities |= 1