Android LocalServerSocket

Question

In android, there are two classes LocalServerSocket and LocalSocket. I think they are something like AF_LOCAL in unix socket (I am not sure it is correct or not).

My que

Answer 1

The following code might not be perfect but it works !!! Thanks for Mike.

Java part (Socket Server) :

package test.socket;

import java.io.IOException;
import java.io.InputStream;

import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.content.Intent;
import android.net.LocalServerSocket;
import android.net.LocalSocket;
import android.net.LocalSocketAddress;
import android.os.Bundle;
import android.util.Log;
import android.view.View;

public class TestSocketActivity extends Activity {

    public static String SOCKET_ADDRESS = "/test/socket/localServer";
    public String TAG = "Socket_Test";


    static{System.loadLibrary("testSocket");}
    private native void clientSocketThreadNative();
    private native void setStopThreadNative();
    localSocketServer mLocalSocketServer;
    localSocketClient mLocalSocketClient;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        mLocalSocketServer = new localSocketServer();

        mLocalSocketClient = new localSocketClient();
    }

    /* LocalSocketServer */
    public class localSocketServer extends Thread {

        int bufferSize = 32;
        byte[] buffer;
        int bytesRead;
        int totalBytesRead;
        int posOffset;
        LocalServerSocket server;
        LocalSocket receiver;
        InputStream input;
        private volatile boolean stopThread;

        public localSocketServer() {
            Log.d(TAG, " +++ Begin of localSocketServer() +++ ");
            buffer = new byte[bufferSize];
            bytesRead = 0;
            totalBytesRead = 0;
            posOffset = 0;

            try {
                server = new LocalServerSocket(SOCKET_ADDRESS);
            } catch (IOException e) {
                // TODO Auto-generated catch block
                Log.d(TAG, "The localSocketServer created failed !!!");
                e.printStackTrace();
            }

             LocalSocketAddress localSocketAddress; 
             localSocketAddress = server.getLocalSocketAddress();
             String str = localSocketAddress.getName();

             Log.d(TAG, "The LocalSocketAddress = " + str);

            stopThread = false;
        }

        public void run() {             
            Log.d(TAG, " +++ Begin of run() +++ ");
                while (!stopThread) {

                    if (null == server){
                        Log.d(TAG, "The localSocketServer is NULL !!!");
                        stopThread = true;
                        break;
                    }

                    try {
                        Log.d(TAG, "localSocketServer begins to accept()");
                        receiver = server.accept();
                    } catch (IOException e) {
                        // TODO Auto-generated catch block
                        Log.d(TAG, "localSocketServer accept() failed !!!");
                        e.printStackTrace();
                        continue;
                    }                   

                    try {
                        input = receiver.getInputStream();
                    } catch (IOException e) {
                        // TODO Auto-generated catch block
                        Log.d(TAG, "getInputStream() failed !!!");
                        e.printStackTrace();
                        continue;
                    }

                    Log.d(TAG, "The client connect to LocalServerSocket");

                    while (receiver != null) {

                        try {
                            bytesRead = input.read(buffer, posOffset,
                                    (bufferSize - totalBytesRead));
                        } catch (IOException e) {
                            // TODO Auto-generated catch block
                            Log.d(TAG, "There is an exception when reading socket");
                            e.printStackTrace();
                            break;
                        }

                        if (bytesRead >= 0) {
                            Log.d(TAG, "Receive data from socket, bytesRead = "
                                    + bytesRead);
                            posOffset += bytesRead;
                            totalBytesRead += bytesRead;
                        }

                        if (totalBytesRead == bufferSize) {
                            Log.d(TAG, "The buffer is full !!!");
                            String str = new String(buffer);
                            Log.d(TAG, "The context of buffer is : " + str);

                            bytesRead = 0;
                            totalBytesRead = 0;
                            posOffset = 0;
                        }

                    }
                    Log.d(TAG, "The client socket is NULL !!!");
                }
                Log.d(TAG, "The LocalSocketServer thread is going to stop !!!");
                if (receiver != null){
                    try {
                        receiver.close();
                    } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }
                if (server != null){
                    try {
                        server.close();
                    } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }
        }

        public void setStopThread(boolean value){
            stopThread = value;
            Thread.currentThread().interrupt(); // TODO : Check
        }

    }

    /* Client native socket */
    public class localSocketClient extends Thread {

        private volatile boolean stopThread;

        public localSocketClient(){
            Log.d(TAG, " +++ Begin of localSocketClient() +++ ");
            stopThread = false;
        }

        public void run(){
            Log.d(TAG, " +++ Begin of run() +++ ");
            while(!stopThread){
                clientSocketThreadNative();
            }
        }

        public void setStopThread(boolean value){
            stopThread = value;
            setStopThreadNative();
            Thread.currentThread().interrupt(); // TODO : Check
        }
    }


    public void bt_startServerOnClick(View v) {
        mLocalSocketServer.start();
    }

    public void bt_startClientOnClick(View v) {
        mLocalSocketClient.start();
    }

    public void bt_stopOnClick(View v) {
        mLocalSocketClient.setStopThread(true);
        mLocalSocketServer.setStopThread(true);
    }

}

Native C part (Client)

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 


#include "test_socket_TestSocketActivity.h"

#define LOCAL_SOCKET_SERVER_NAME "/test/socket/localServer"

volatile int stopThread;

#ifndef __JNILOGGER_H_
#define __JNILOGGER_H_ 
#include  
#ifdef __cplusplus
extern "C" {
#endif
#ifndef LOG_TAG
#define LOG_TAG "NativeSocket"
#endif
#define LOGD(...) __android_log_print(ANDROID_LOG_DEBUG,LOG_TAG,__VA_ARGS__)
#define LOGI(...) __android_log_print(ANDROID_LOG_INFO,LOG_TAG,__VA_ARGS__)
#define LOGW(...) __android_log_print(ANDROID_LOG_WARN,LOG_TAG,__VA_ARGS__)
#define LOGE(...) __android_log_print(ANDROID_LOG_ERROR,LOG_TAG,__VA_ARGS__)
#define LOGF(...) __android_log_print(ANDROID_LOG_FATAL,LOG_TAG,__VA_ARGS__)
#define LOGS(...) __android_log_print(ANDROID_LOG_SILENT,LOG_TAG,__VA_ARGS__)
#define LOGV(...) __android_log_print(ANDROID_LOG_VERBOSE,LOG_TAG,__VA_ARGS__)
#ifdef __cplusplus
}
#endif
#endif /* __JNILOGGER_H_ */ 


JNIEXPORT void JNICALL Java_test_socket_TestSocketActivity_clientSocketThreadNative
  (JNIEnv *env, jobject object){

    LOGD("In clientSocketThreadNative() : Begin");

    stopThread = 0;

    int sk, result;
    int count = 1;
    int err;

    char *buffer = malloc(8);

    int i;
    for(i = 0; i<8; i++){
        buffer[i] = (i+1);
    }

    struct sockaddr_un addr;
    socklen_t len;
    addr.sun_family = AF_LOCAL;
    /* use abstract namespace for socket path */
    addr.sun_path[0] = '\0';
    strcpy(&addr.sun_path[1], LOCAL_SOCKET_SERVER_NAME );
    len = offsetof(struct sockaddr_un, sun_path) + 1 + strlen(&addr.sun_path[1]);

    LOGD("In clientSocketThreadNative() : Before creating socket");
    sk = socket(PF_LOCAL, SOCK_STREAM, 0);
    if (sk < 0) {
        err = errno;
        LOGD("%s: Cannot open socket: %s (%d)\n",
            __FUNCTION__, strerror(err), err);
        errno = err;
        return;
    }

    LOGD("In clientSocketThreadNative() : Before connecting to Java LocalSocketServer");
    if (connect(sk, (struct sockaddr *) &addr, len) < 0) {
        err = errno;
        LOGD("%s: connect() failed: %s (%d)\n",
            __FUNCTION__, strerror(err), err);
        close(sk);
        errno = err;
        return;
    }

    LOGD("In clientSocketThreadNative() : Connecting to Java LocalSocketServer succeed");
    while(!stopThread){
        result = write(sk, buffer, 8);
        LOGD("In clientSocketThreadNative() : Total write = %d", result);
        count++;
        if(4 == count){
            sleep(1);
            count = 0;
        } 
    }


    LOGD("In clientSocketThreadNative() : End");
}


JNIEXPORT void JNICALL Java_test_socket_TestSocketActivity_setStopThreadNative
  (JNIEnv *env, jobject object){

    stopThread = 1;

}