关于Android应用与Framework的socket通信，相信关心这个问题的朋友们已经看过《android使用socket使底层和framework通信》这篇文章，美中不足的是作者只贴出一些关键的代码片段而并没有放出源码。我这里还是以一个能实际运行的例子为基础来讲，这样也方便大家学习。

首先看一下效果，如下图。我填写姓名"Potter"，选择性别"Mr"然后点击发送，底层socket收到消息后将消息直接返回给我，我将返回的结果（Mr.Potter）直接显示在Result。

编写socket服务端代码，生成可执行脚本htfsk。

#define SOCKET_NAME "htfsk"#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <sys/un.h>
#include <cutils/sockets.h>
#include <utils/Log.h>
#include <android/log.h>int main(){char log[200]; int connect_number = 6;int fdListen = -1, new_fd = -1;int ret;struct sockaddr_un peeraddr;socklen_t socklen = sizeof (peeraddr);int numbytes ;char buff[256];//这一步很关键，就是获取init.rc中配置的名为 "htfsk" 的socketfdListen = android_get_control_socket(SOCKET_NAME);if (fdListen < 0) {sprintf(log,"Failed to get socket '" SOCKET_NAME "' errno:%d", errno);__android_log_write(ANDROID_LOG_DEBUG,"FTM_JNI",log); exit(-1);}//开始监听ret = listen(fdListen, connect_number);    sprintf(log,"Listen result %d",ret);__android_log_write(ANDROID_LOG_DEBUG,"FTM_JNI",log); if (ret < 0) {perror("listen");exit(-1);}//等待Socket客户端发启连接请求new_fd = accept(fdListen, (struct sockaddr *) &peeraddr, &socklen);sprintf(log,"Accept_fd %d",new_fd);__android_log_write(ANDROID_LOG_DEBUG,"FTM_JNI",log); if (new_fd < 0 ) {sprintf(log,"%d",errno);__android_log_write(ANDROID_LOG_DEBUG,"FTM_JNI",log); perror("accept error");exit(-1);}while(1){//循环等待Socket客户端发来消息__android_log_write(ANDROID_LOG_DEBUG,"FTM_JNI","Waiting for receive");if((numbytes = recv(new_fd,buff,sizeof(buff),0))==-1){sprintf(log,"%d",errno);__android_log_write(ANDROID_LOG_DEBUG,"FTM_JNI",log); perror("recv");continue;}//发送消息回执给Socket客户端if(send(new_fd,buff,strlen(buff),0)==-1){perror("send");close(new_fd);exit(0);}      }close(new_fd);close(fdListen);return 0;
}

3、编写客户端java代码。核心代码如下：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;import android.net.LocalSocket;
import android.net.LocalSocketAddress;
import android.util.Log;/*** Socket客户端* * @author lai_zs* @date：2012-3-17 下午12:15:09*/
public class SocketClient {private final String SOCKET_NAME = "htfsk";private LocalSocket client;private LocalSocketAddress address;private boolean isConnected = false;private int connetTime = 1;public SocketClient() {client = new LocalSocket();address = new LocalSocketAddress(SOCKET_NAME, LocalSocketAddress.Namespace.RESERVED);new ConnectSocketThread().start();}/*** 发送消息* @param msg* @return 返回Socket服务端的消息回执*/public String sendMsg(String msg) {if (!isConnected) {return "Connect fail";}try {BufferedReader in = new BufferedReader(new InputStreamReader(client.getInputStream()));PrintWriter out = new PrintWriter(client.getOutputStream());out.println(msg);out.flush();return in.readLine();} catch (IOException e) {e.printStackTrace();}return "Nothing return";}/*** 异步连接Socket,如果连接不上会尝试重复连接十次* * @author Administrator* */private class ConnectSocketThread extends Thread {@Overridepublic void run() {while (!isConnected && connetTime <= 10) {try {sleep(1000);Log.i("SocketClient","Try to connect socket;ConnectTime:"+connetTime);client.connect(address);isConnected = true;} catch (Exception e) {connetTime++;isConnected = false;Log.i("SocketClient","Connect fail");}}}}/*** 关闭Socket*/public void closeSocket() {try {client.close();} catch (IOException e) {e.printStackTrace();}}}