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其实，我已经在android模拟器（ps：它们都运行成功，并与android genric交叉编译器编译）server.c和client.c做了testing。然后，我进一步，我重写客户端而通过jni.But，在这种情况下，客户端无法连接到服务器端，虽然新的客户端是非常类似于client.c。 但是，当我添加<uses-permission android:name="android.permission.INTERNET" /> （ps：这个标签在应用程序标签之外）时，问题仍然出现。 正如logcat所显示的那样，java代码实际上是调用c方法，但为什么不像client.c那样？ 任何想法都会使我受益匪浅。提前感谢！

server.c：

/* Make the necessary includes and set up the variables. */ #include <sys/types.h> #include <sys/socket.h> #include <stdio.h> #include <sys/un.h> #include <unistd.h> #include <stdlib.h> int main() { int server_sockfd,client_sockfd; int server_len,client_len; struct sockaddr_un server_address; struct sockaddr_un client_address; /* Remove any old socket and create an unnamed socket for the server. */ unlink("server_socket"); server_sockfd = socket(AF_UNIX,SOCK_STREAM,0); /* Name the socket. */ server_address.sun_family = AF_UNIX; strcpy(server_address.sun_path,"server_socket"); server_len = sizeof(server_address); bind(server_sockfd,(struct sockaddr *)&server_address,server_len); /* Create a connection queue and wait for clients. */ listen(server_sockfd,5); while(1) { char ch; printf("server waitingn"); /* Accept a connection. */ client_len = sizeof(client_address); client_sockfd = accept(server_sockfd,(struct sockaddr *)&client_address,&client_len); /* We can Now read/write to client on client_sockfd. */ read(client_sockfd,&ch,1); ch++; write(client_sockfd,1); close(client_sockfd); } }

client.c：

/* Make the necessary includes and set up the variables. */ #include <sys/types.h> #include <sys/socket.h> #include <stdio.h> #include <sys/un.h> #include <unistd.h> #include <stdlib.h> int main() { int sockfd; int len; struct sockaddr_un address; int result; char ch = 'A'; /* Create a socket for the client. */ sockfd = socket(AF_UNIX,0); /* Name the socket,as agreed with the server. */ address.sun_family = AF_UNIX; strcpy(address.sun_path,"server_socket"); len = sizeof(address); /* Now connect our socket to the server's socket. */ result = connect(sockfd,(struct sockaddr *)&address,len); if(result == -1) { perror("oops: client1"); exit(1); } /* We can Now read/write via sockfd. */ write(sockfd,1); read(sockfd,1); printf("char from server = %cn",ch); close(sockfd); exit(0); }

java代码：package gz.kaiwii;

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public class NSocket { static{ System.loadLibrary("NSocket"); } public native void start(); }

本地代码：

/* DO NOT EDIT THIS FILE - it is machine generated */ #include <jni.h> #include <android/log.h> #include <android/bitmap.h> #include <sys/types.h> #include <sys/socket.h> #include <stdio.h> #include <sys/un.h> #include <unistd.h> #include <stdlib.h> #define LOG_TAG "NSocket" #define LOGI(...) __android_log_print(ANDROID_LOG_INFO,LOG_TAG,__VA_ARGS__) #define LOGE(...) __android_log_print(ANDROID_LOG_ERROR,__VA_ARGS__) JNIEXPORT void JNICALL Java_gz_kaiwii_NSocket_start (jnienv * env,jobject object){ LOGI("JNICALL Java_gz_kaiwii_NSocket_start is called!"); int sockfd; int len; struct sockaddr_un address; int result; char ch = 'A'; /* Create a socket for the client. */ LOGI(" Create a socket for the client!"); sockfd = socket(AF_UNIX,0); if(sockfd==-1){ LOGE("create socket error!!!!!"); } /* Name the socket,len); LOGI(" Now connect our socket to the server's socket."); if(result == -1) { LOGE("connect error!"); exit(1); } /* We can Now read/write via sockfd. */ write(sockfd,1); /* printf("char from server = %cn",ch); */ LOGI("char from server = %cn",ch); close(sockfd); }

logcat：

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如果我使用抽象名称空间作为名称，一切都运行正常。但是，有一点要注意的是长度！