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socket
fdListen = 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 {
@Override
public 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();
}
}
}
