package com.example.ksswj; import androidx.appcompat.app.AppCompatActivity; import android.annotation.SuppressLint; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.net.Socket; import java.net.UnknownHostException; public class MainActivity extends AppCompatActivity { private EditText ipEditText; private EditText portEditText; private TextView messageTextView; private BufferedReader in; private Socket socket; @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); messageTextView = findViewById(R.id.messageTextView); 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()); try { socket = new Socket(ip, port); in = new BufferedReader(new InputStreamReader(socket.getInputStream())); // 在主页面中的窗口中实时显示消息 new Thread(new Runnable() { @Override public void run() { try { while (true) { String message = in.readLine(); if (message == null) { break; } runOnUiThread(new Runnable() { @Override public void run() { messageTextView.append(message + "\n"); } }); } } catch (IOException e) { e.printStackTrace(); } } }).start(); } catch (UnknownHostException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } }); } @Override protected void onDestroy() { super.onDestroy(); try { if (in != null) { in.close(); } if (socket != null) { socket.close(); } } catch (IOException e) { e.printStackTrace(); } } }帮我将代码改成线程执行网络操作

好的，这是修改后的代码：

package com.example.ksswj;

import androidx.appcompat.app.AppCompatActivity;

import android.annotation.SuppressLint;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Socket;
import java.net.UnknownHostException;

public class MainActivity extends AppCompatActivity {

    private EditText ipEditText;
    private EditText portEditText;
    private TextView messageTextView;
    private BufferedReader in;
    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);
        messageTextView = findViewById(R.id.messageTextView);
        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 Thread(new Runnable() {
                    @Override
                    public void run() {
                        try {
                            socket = new Socket(ip, port);
                            in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
                            // 在主页面中的窗口中实时显示消息
                            while (true) {
                                String message = in.readLine();
                                if (message == null) {
                                    break;
                                }
                                handler.post(new Runnable() {
                                    @Override
                                    public void run() {
                                        messageTextView.append(message + "\n");
                                    }
                                });
                            }
                        } catch (UnknownHostException e) {
                            e.printStackTrace();
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                    }
                }).start();
            }
        });
    }

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

我将原来的代码包装在一个线程中，以避免在主线程上执行网络操作。我还添加了一个 `Handler` 对象来确保在主线程上更新 UI。