做法1：activity里开个线程，子线程里创建个socket，通过network绑定到4G，然后把这个socket句柄传递给so进程
mSock = new DatagramSocket();
network.bindSocket(mSock);
ParcelFileDescriptor ps = ParcelFileDescriptor.fromDatagramSocket(mSock);
m_cellsock = ps.getFd();//再通过localsocket把m_cellsock 传递给so进程
结果失败，进程拿到这个fd后无法发数据，错误码为9，无效socket
做法2：so进程创建socket后，把socket句柄值写入文件，activity读文件，用这个fd值创建个socket，再network绑定4G
public static void bindSocketToNetwork(int socketfd) {
L.d("start bindSocketToNetwork");
if (network != null && Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
FileDescriptor fileDescriptor = new FileDescriptor();
try {
Field field = FileDescriptor.class.getDeclaredField("descriptor");
field.setAccessible(true);
field.setInt(fileDescriptor, socketfd);
// fileDescriptor.sync();
network.bindSocket(fileDescriptor);
// bindSocket(socketfd, netId);
L.d("bindSocketToNetwork success: network" + network + "+socketfd" + socketfd);
} catch (Exception e) {
e.printStackTrace();
}
}
}
结果失败，还是socket无效，log输出：java.net.SocketException: getpeername failed: ENOTSOCK (Socket operation on non-socket)
诚心请教so进程里的socket怎样绑定到4G，使得同时存在既走4G又走wifi的2个socket。
