private EditText ipEditText; private EditText portEditText; private TextView messageTextView; private BufferedReader in; private PrintWriter out; private Socket socket; private Handler handler = new Handler(); @SuppressLint("MissingInflatedId") @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ipEditText = findViewById(R.id.ipEditText); portEditText = findViewById(R.id.portEditText); Button connectButton = findViewById(R.id.connectButton); connectButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { String ip = ipEditText.getText().toString(); int port = Integer.parseInt(portEditText.getText().toString()); new ConnectTask().execute(ip, String.valueOf(port)); } }); Button sendMessageButton = findViewById(R.id.sendMessageButton); sendMessageButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { showSendMessageDialog(); } }); } private class ConnectTask extends AsyncTask<String, Void, Void> { @Override protected Void doInBackground(String... params) { String ip = params[0]; int port = Integer.parseInt(params[1]); try { socket = new Socket(ip, port); in = new BufferedReader(new InputStreamReader(socket.getInputStream())); out = new PrintWriter(socket.getOutputStream(), true); // 获取SeekBar对象 SeekBar progressBar = findViewById(R.id.progressBar); // 添加OnSeekBarChangeListener监听器 progressBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() { @Override public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { // 计算百分比对应的数字 int number = progress * 10; int tnum = 0; tnum = number; out.println(tnum); } @Override public void onStartTrackingTouch(SeekBar seekBar) {} @Override public void onStopTrackingTouch(SeekBar seekBar) {} }); } catch (UnknownHostException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return null; } } @Override protected void onDestroy() { super.onDestroy(); try { if (in != null) { in.close(); } if (out != null) { out.close(); } if (socket != null) { socket.close(); } } catch (IOException e) { e.printStackTrace(); } } private void showSendMessageDialog() { AlertDialog.Builder builder = new AlertDialog.Builder(this); LayoutInflater inflater = getLayoutInflater(); View view = inflater.inflate(R.layout.dialog_send_message, null); final EditText messageEditText = view.findViewById(R.id.messageEditText); builder.setView(view) .setTitle("发送消息") .setPositiveButton("发送", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { String message = messageEditText.getText().toString(); if (out != null) { new Thread(new Runnable() { @Override public void run() { out.println(message); } }).start(); } } }) .setNegativeButton("取消", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.cancel(); } }) .create() .show(); }代码有问题，修改一下

这段代码的问题在于：

1. `onPostExecute()` 方法没有被实现。
2. `ProgressBar` 的更新应该在 UI 线程中进行。
3. 在 `AsyncTask` 中创建 `SeekBar` 的操作应该在 UI 线程中进行。

下面是修改后的代码：

private EditText ipEditText;
private EditText portEditText;
private TextView messageTextView;
private BufferedReader in;
private PrintWriter out;
private Socket socket;

private Handler handler = new Handler();

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

    ipEditText = findViewById(R.id.ipEditText);
    portEditText = findViewById(R.id.portEditText);

    Button connectButton = findViewById(R.id.connectButton);
    connectButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            String ip = ipEditText.getText().toString();
            int port = Integer.parseInt(portEditText.getText().toString());
            new ConnectTask().execute(ip, String.valueOf(port));
        }
    });

    Button sendMessageButton = findViewById(R.id.sendMessageButton);
    sendMessageButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            showSendMessageDialog();
        }
    });
}

private class ConnectTask extends AsyncTask<String, Void, Void> {
    @Override
    protected Void doInBackground(String... params) {
        String ip = params[0];
        int port = Integer.parseInt(params[1]);
        try {
            socket = new Socket(ip, port);
            in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            out = new PrintWriter(socket.getOutputStream(), true);

            // 在 UI 线程中创建 SeekBar
            handler.post(new Runnable() {
                @Override
                public void run() {
                    SeekBar progressBar = findViewById(R.id.progressBar);
                    progressBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
                        @Override
                        public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
                            // 计算百分比对应的数字
                            int number = progress * 10;
                            int tnum = 0;
                            tnum = number;
                            // 在 UI 线程中更新 ProgressBar 的进度
                            handler.post(new Runnable() {
                                @Override
                                public void run() {
                                    seekBar.setProgress(progress);
                                }
                            });
                            out.println(tnum);
                        }

                        @Override
                        public void onStartTrackingTouch(SeekBar seekBar) {}

                        @Override
                        public void onStopTrackingTouch(SeekBar seekBar) {}
                    });
                }
            });

        } catch (UnknownHostException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }

    @Override
    protected void onPostExecute(Void aVoid) {
        // 在连接结束后做一些处理
        // 比如关闭连接或者显示连接成功的提示
    }
}

@Override
protected void onDestroy() {
    super.onDestroy();
    try {
        if (in != null) {
            in.close();
        }
        if (out != null) {
            out.close();
        }
        if (socket != null) {
            socket.close();
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
}

private void showSendMessageDialog() {
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    LayoutInflater inflater = getLayoutInflater();
    View view = inflater.inflate(R.layout.dialog_send_message, null);
    final EditText messageEditText = view.findViewById(R.id.messageEditText);
    builder.setView(view)
            .setTitle("发送消息")
            .setPositiveButton("发送", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    String message = messageEditText.getText().toString();
                    if (out != null) {
                        new Thread(new Runnable() {
                            @Override
                            public void run() {
                                out.println(message);
                            }
                        }).start();
                    }
                }
            })
            .setNegativeButton("取消", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    dialog.cancel();
                }
            })
            .create()
            .show();
}