跨进程之Socket

最新推荐文章于 2025-06-09 10:07:42 发布

PatrickYs

最新推荐文章于 2025-06-09 10:07:42 发布

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CC 4.0 BY-SA版权

本文链接：https://blog.youkuaiyun.com/qq_39801871/article/details/84890687

本文详细介绍了一种在Android中实现跨进程通信的方法——Socket通信。通过创建服务端与客户端，实现了不同进程间的实时数据传输。文章提供了完整的代码示例，包括清单文件配置、MainActivity、SocketUtil类、ServerService类及子进程Activity的实现。

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Socket通讯对于Android跨进程来说有些杀鸡用牛刀的感觉。这也是一种办法，主要用于两个进程间进行数据互通实时刷新

先上清单文件

        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <service
            android:name=".ServerService"
            android:process=":remote" />

        <activity
            android:name=".ArActivity"
            android:process=":remote" />

MainActivity代码实列

package com.example.mysocket;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;

import java.io.IOException;
import java.net.Socket;

public class MainActivity extends AppCompatActivity {

    private static final String TAG = "DEBUG-WCL: " + MainActivity.class.getSimpleName();

    private Socket socket = null;  //客戶端Socket


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        Intent intent = new Intent(this, ServerService.class);
        startService(intent);

        SocketUtils.getInstance().startSocket();


        findViewById(R.id.tiao).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                startActivity(new Intent(MainActivity.this,ArActivity.class));
            }
        });

    }

    @Override
    protected void onDestroy() {

        if (socket != null) {
            try {
                socket.shutdownInput();
                socket.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        super.onDestroy();

    }



}

SocketUtil类

package com.example.mysocket;

import android.os.SystemClock;
import android.util.Log;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.Socket;
import java.util.Timer;
import java.util.TimerTask;

public class SocketUtils {

    private Socket socket;
    private PrintWriter mPrintWriter;

    private int i=0;

    // 私有构造
    private SocketUtils() {

    }

    private static SocketUtils single = null;

    // 双重检查
    public static SocketUtils getInstance() {
        if (single == null) {
            synchronized (SocketUtils.class) {
                if (single == null) {
                    single = new SocketUtils();
                }
            }
        }
        return single;
    }

    public void  startSocket(){
        new Thread(new Runnable() {
            @Override
            public void run() {
                connectTCPServer();
            }
        }).start();

        setTimer();
    }



    /**
     * 连接TCP服务器
     */
    private void connectTCPServer() {

        // 不停重试直到连接成功为止
        while (socket == null) {
            try {
                socket = new Socket("localhost", ServerService.PORT);

                mPrintWriter = new PrintWriter(new BufferedWriter(
                        new OutputStreamWriter(socket.getOutputStream())), true);

                Log.e("TAG", "服务器连接成功");

            } catch (IOException e) {
                SystemClock.sleep(300);
                Log.e("TAG", "连接TCP服务失败, 重试...");
            }

        }

        try {
            BufferedReader br = new BufferedReader(
                    new InputStreamReader(socket.getInputStream()));
            while (true) {
                String msg = br.readLine();
                if (msg != null) {
                    Log.e("TAG","数据:"+msg);
                }
            }

        } catch (IOException e) {
            e.printStackTrace();
        }

        ServerService.close(mPrintWriter);
        try {
            socket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    private void setTimer(){
        Timer timer=new Timer();

        TimerTask task=new TimerTask() {
            @Override
            public void run() {

                i++;

                if(mPrintWriter!=null){
                    mPrintWriter.println("韩开"+i);
                }


            }
        };
        timer.schedule(task,1000,2000);
    }

}

Service类

package com.example.mysocket;

import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.IBinder;
import android.support.annotation.Nullable;
import android.util.Log;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.Closeable;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

/**
 * TCP的服务端
 * <p/>
 * Created by wangchenlong on 16/6/16.
 *
 * 提供单列  如果断开 自行做操作保活重新链接
 */
public class ServerService extends Service {

    private static final String TAG = "DEBUG-WCL: " + ServerService.class.getSimpleName();

    private boolean mIsServiceDestroyed = false;

    public static final int PORT = 1709;
    private Socket client;

    @Override
    public void onCreate() {
        new Thread(new TcpServer()).start();
        super.onCreate();
    }

    @Override
    public void onDestroy() {
        mIsServiceDestroyed = true;
        super.onDestroy();
    }

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return new MsgBinder();
    }

    private MessageInterface messageInterface;

    public void setMessageInterface(MessageInterface messageInterface) {
        this.messageInterface = messageInterface;
    }


    public void sendMessage(final int i) {
        new Thread() {
            @Override
            public void run() {
                try {
                    // 向客户端发送消息
                    PrintWriter out = new PrintWriter(new BufferedWriter(
                            new OutputStreamWriter(client.getOutputStream())), true);
                    out.println(i);
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }.start();
    }


    public class MsgBinder extends Binder {
        /**
         * 获取当前Service的实例
         * @return
         */
        public ServerService getService(){
            return ServerService.this;
        }

    }

    private class TcpServer implements Runnable {

        @Override
        public void run() {
             final ServerSocket serverSocket;
            try {
                serverSocket = new ServerSocket(PORT);
            } catch (IOException e) {
                Log.e(TAG, "建立链接失败, 端口:" + PORT);
                e.printStackTrace();
                return; // 链接建立失败直接返回
            }

            while (!mIsServiceDestroyed) {
                try {
                    client = serverSocket.accept();
                    Log.e(TAG, "接收数据");
                    new Thread() {
                        @Override
                        public void run() {
                            try {
                                responseClient(client);
                            } catch (IOException e) {
                                e.printStackTrace();
                            }
                        }
                    }.start();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    /**
     * 接收客户端的消息
     *
     * @param client 客户端
     * @throws IOException
     */
    private void responseClient(Socket client) throws IOException {


        // 接收客户端消息
        BufferedReader in = new BufferedReader(
                new InputStreamReader(client.getInputStream()));

//        // 向客户端发送消息
//        PrintWriter out = new PrintWriter(new BufferedWriter(
//                new OutputStreamWriter(client.getOutputStream())), true);
//
//        out.println(0);

        while (!mIsServiceDestroyed) {
            String str = in.readLine();
            Log.e("TAG","----"+str);

            if(messageInterface!=null){
                messageInterface.getString(str);
            }

            if (str == null) {
                break;
            }

        }

        Log.e(TAG, "客户端退出: ");


        // 关闭通信
//        close(out);
        close(in);
        client.close();

    }


    /**
     * 关闭
     * @param closeable 关闭
     */
    public static void close(Closeable closeable) {
        try {
            if (closeable != null) {
                closeable.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}

数据传输接口

package com.example.mysocket;

/**
 * 数据更新接口
 */
public interface MessageInterface {

    void getString(String msg);

}

子进程Activity类

package com.example.mysocket;

import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.IBinder;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;

/**
 * 接收端
 * 子进程
 */

public class ArActivity extends AppCompatActivity implements MessageInterface{

    private TextView ar_tv;
    private ServerService service1;
    private ServiceConnection serviceConnection;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_ar);

        ar_tv = findViewById(R.id.ar_tv);

        //下载的Service绑定
        Intent intent = new Intent(ArActivity.this, ServerService.class);
        serviceConnection = new ServiceConnection() {
            @Override
            public void onServiceConnected(ComponentName name, IBinder service) {
                service1 = ((ServerService.MsgBinder) service).getService();
                service1.setMessageInterface(ArActivity.this);
            }

            @Override
            public void onServiceDisconnected(ComponentName name) {

            }
        };
        bindService(intent, serviceConnection, Context.BIND_AUTO_CREATE);


    }

    /**
     * 接口回调数据
     * @param msg
     */
    @Override
    public void getString(final String msg) {
        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                ar_tv.setText(msg);
            }
        });
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        unbindService(serviceConnection);
    }

}

原文链接 https://www.jianshu.com/p/c9342eada3dd