android - 如何使用 TCP 套接字传输位图

Question

我有一个服务器/客户端应用程序，我想在其中发送并在客户端显示服务器的屏幕截图。任何人都可以帮助我吗？谢谢

代码如下

服务器端

public class ServerActivity extends Activity {

private TextView serverStatus;
RelativeLayout mainLayout;


// default ip
public static String SERVERIP = "10.0.2.15";

// designate a port
public static final int SERVERPORT = 8080;

private Handler handler = new Handler();

private ServerSocket serverSocket;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.server);
    serverStatus = (TextView) findViewById(R.id.server_status);


    SERVERIP = getLocalIpAddress();

    Thread fst = new Thread(new ServerThread());
    fst.start();
}

public class ServerThread implements Runnable {

    public void run() {
        try {
            if (SERVERIP != null) {
                handler.post(new Runnable() {
                    @Override
                    public void run() {
                        serverStatus.setText("Listening on IP: " + SERVERIP);
                    }
                });
                serverSocket = new ServerSocket(SERVERPORT);

                while (true) {
                 // listen for incoming clients
                  Socket client = serverSocket.accept();
                    handler.post(new Runnable() {
                        @Override
                        public void run() {
                            serverStatus.setText("Connected");                  
                        mainLayout = (RelativeLayout)findViewById(R.id.screen);
                            ImageView iv =(ImageView)findViewById(R.id.iv);
                            File root = Environment.getExternalStorageDirectory();
                            File file = new File(root,"androidlife.jpg");
                  Bitmap b = Bitmap.createBitmap(mainLayout.getWidth(), mainLayout
                        .getHeight(), Bitmap.Config.ARGB_8888);
                  iv.setImageBitmap(b);
                  Canvas c = new Canvas(b);
                  mainLayout.draw(c); 

                             //serverStatus.setText("Screenshot is displaying");
                        }
                    });

                    try {


                        BufferedReader in = new BufferedReader(new InputStreamReader(client.getInputStream()));
                        BufferedWriter out = new BufferedWriter(new OutputStreamWriter(client.getOutputStream()));
                        //receive a message
                        String incomingMsg = in.readLine() + System.getProperty("line.separator");
                        Log.i("TcpServer", "received: " + incomingMsg);
                        serverStatus.setText("received: " + incomingMsg);
                        //send a message
                        String outgoingMsg = "goodbye from port " + SERVERPORT + System.getProperty("line.separator");
                        out.write(outgoingMsg);
                        //out.flush();
                        Log.i("TcpServer", "sent: " + outgoingMsg);
                        serverStatus.setText("sent: " + outgoingMsg);
                        //while ((line = in.readLine()) != null)      
                            handler.post(new Runnable() {
                                @Override
                                public void run() {


                                }
                            });
                       // }
                        break;
                    }  
                        catch (Exception e) {
                        handler.post(new Runnable() {
                            @Override
                            public void run() {
                                serverStatus.setText("Oops. Connection interrupted. Please reconnect your phones.");
                            }
                        });
                        e.printStackTrace();
                    }
                }
            } else {
                handler.post(new Runnable() {
                    @Override
                    public void run() {
                        serverStatus.setText("Couldn't detect internet connection.");
                    }
                });
            }
        } catch (Exception e) {
            handler.post(new Runnable() {
                @Override
                public void run() {
                    serverStatus.setText("Error");
                }
            });
            e.printStackTrace();
        }
    }
}

// gets the ip address of your phone's network
private String getLocalIpAddress() {
    try {
        for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) {
            NetworkInterface intf = en.nextElement();
            for (Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements();) {
                InetAddress inetAddress = enumIpAddr.nextElement();
                if (!inetAddress.isLoopbackAddress()) { return inetAddress.getHostAddress().toString(); }
            }
        }
    } catch (SocketException ex) {
        Log.e("ServerActivity", ex.toString());
    }
    return null;
}

@Override
protected void onStop() {
    super.onStop();
    try {
         // make sure you close the socket upon exiting
         serverSocket.close();

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

客户端代码是:

public class ClientActivity extends Activity {

public EditText serverIp;
public TextView tv;

private Button connectPhones;

private String serverIpAddress = "";
private static final int SERVERPORT = 8080;

private boolean connected = false;

//private Handler handler = new Handler();

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

    serverIp = (EditText) findViewById(R.id.server_ip);
    connectPhones = (Button) findViewById(R.id.connect_phones);
    connectPhones.setOnClickListener(connectListener);
}


private OnClickListener connectListener = new OnClickListener() {

    @Override
    public void onClick(View v) {
        // if(true)
        if (!connected) {
            serverIpAddress = serverIp.getText().toString();
            if (!serverIpAddress.equals("")) {
                Thread cThread = new Thread(new ClientThread());
                cThread.start();
            }
        }
    }
};

public class ClientThread implements Runnable {

    public void run() {
        try {
            InetAddress serverAddr = InetAddress.getByName(serverIpAddress);
            Log.d("ClientActivity", "C: Connecting...");
             Socket socket = new Socket(serverAddr, SERVERPORT);
            connected = true;
            while (connected) {
                try {
                    BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
                    BufferedWriter out = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
                    //send output msg
                    String outMsg = "TCP connecting to " + SERVERPORT + System.getProperty("line.separator"); 
                    out.write(outMsg);
                    out.flush();
                    Log.i("TcpClient", "sent: " + outMsg);
                    //accept server response
                    String inMsg = in.readLine() + System.getProperty("line.separator");
                    tv.setText("message from server"+ inMsg);
                    Log.i("TcpClient", "received: " + inMsg);
                //  ImageView iv = (ImageView)findViewById(R.id.iv);
                   // iv.setImageBitmap(bm); 
                        Log.d("ClientActivity", "C: Sent.");
                } catch (Exception e) {
                    Log.e("ClientActivity", "S: Error", e);
                }
            }
            socket.close();
            Log.d("ClientActivity", "C: Closed.");
        } catch (Exception e) {
            Log.e("ClientActivity", "C: Error", e);
            connected = false;
        }
    }
  }
}

Answer 1

我没有在您的代码中看到您尝试将图像或屏幕截图的位图发送到哪里!!并且您不能通过套接字发送位图，您应该在创建位图 b 以从位图中创建字节数组后将其添加到发送方:

                ByteArrayOutputStream stream = new ByteArrayOutputStream();
                b.compress(Bitmap.CompressFormat.PNG, 100, stream);
                byte[] byteArray = stream.toByteArray();

在服务器端接收字节数组，然后以这种方式重新创建位图:

                Bitmap breceived = BitmapFactory.decodeByteArray(byteArray, 0, byteArray.length);