Android 设备间TCP通讯

TcpService

初始化ServerSocket

    class SocketAcceptThread extends Thread{
        @Override
        public void run() {
            try {
                mServerSocket = new ServerSocket(5566);
                mSocket = mServerSocket.accept();
                inputStream = mSocket.getInputStream();
                while (true){
                    byte[] buffer = new byte[1024];
                    try {
                        if (null != inputStream){
                            inputStream.read(buffer);
                            String s = new String(buffer);
                            Message messagehand = new Message();
                            messagehand.obj =s;
                            mHandler.sendMessage(messagehand);
                        }
                    } catch (Exception e) {
                        e.printStackTrace();
                    }

                }
            } catch (Exception e) {
                e.printStackTrace();
                return;
            }
        }
    }

Handler更新UI

    @SuppressLint("HandlerLeak")
    Handler mHandler = new Handler(){
        @Override
        public void handleMessage(@NonNull Message msg) {
            super.handleMessage(msg);
            if (null != msg && null != msg.obj){
                String s = msg.obj.toString();
                Toast.makeText(MainActivity.this,s,Toast.LENGTH_SHORT).show();
            }
        }
    };

启动线程

 new SocketAcceptThread().start();

TcpClient

初始化Socket 设置Service的ip和约定好的端口号

    class SocketConnectThread extends Thread{
        public void run(){
            try {
                mSocket = new Socket("192.168.3.186",5566);
                if(mSocket != null){
                    outputStream = mSocket.getOutputStream();
                }
            } catch (Exception e) {
                e.printStackTrace();
                mHandler.sendEmptyMessage(MSG_SOCKET_CONNECTFAIL);
                return;
            }
            mHandler.sendEmptyMessage(MSG_SOCKET_CONNECT);
        }
    }

Handler更新UI

    @SuppressLint("HandlerLeak")
    Handler mHandler = new Handler(){
        @Override
        public void handleMessage(@NonNull Message msg) {
            super.handleMessage(msg);
        }
    };

发送消息 所有网络操作需要在子线程中进行

    public void send(View view) {
        new Thread(() -> {
            try {
                outputStream.write(TextUtils.isEmpty(editText.getText().toString())?"默认消息".getBytes():editText.getText().toString().getBytes());
                outputStream.flush();
            }catch (Exception e) {
                e.printStackTrace();
            }
        }).start();
    }

最后启动线程

 new SocketConnectThread().start();

记得管理 Socker 和 ServerSocket 的生命周期。