android的NDK和java進行本地socket通訊

關於Android應用與Framework的socket通訊，相信關心這個問題的朋友們已經看過《android使用socket使底層和framework通訊》這篇文章，美中不足的是作者只貼出一些關鍵的程式碼片段而並沒有放出源碼。我這裡還是以一個能實際啟動並執行例子為基礎來講，這樣也方便大家學習。

    首先看一下效果，如。我填寫姓名"Potter"，選擇性別"Mr"然後點擊發送，底層socket收到訊息後將訊息直接返回給我，我將返回的結果（Mr.Potter）直接顯示在Result。

編寫socket服務端代碼，產生可執行指令碼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];    //這一步很關鍵，就是擷取init.rc中配置的名為 "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);    }    //開始監聽    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用戶端發啟串連請求    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){//迴圈等待Socket用戶端發來訊息__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;}//發送訊息回執給Socket用戶端if(send(new_fd,buff,strlen(buff),0)==-1){perror("send");close(new_fd);exit(0);}    }        close(new_fd);    close(fdListen);    return 0;}

3、編寫用戶端java代碼。核心代碼如下：

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用戶端 *  * @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();}/** * 發送訊息 * @param msg * @return 返回Socket服務端的訊息回執 */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";}/** * 非同步串連Socket,如果串連不上會嘗試重複串連十次 *  * @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");}}}}/** * 關閉Socket */public void closeSocket() {try {client.close();} catch (IOException e) {e.printStackTrace();}}}