在您将此标记为重复之前，请听我说完。我已经从 StackOverflow 的成员那里得到了以前的建议，但我仍然无法让它工作，但我已经改进了我的代码并限制了可能是什么问题，但我不明白我做错了什么。仅供参考：这是我正在制作的客户端-服务器聊天程序的客户端。我已经制作了完全正常运行的服务器和客户端的 PC 版本。
关于我认为可能是问题的根源。如果您查看 ServerTask 类（按下连接按钮时执行），它看起来好像没有启动套接字？有人可以广泛帮助我吗？如果有人可以帮助这个绝望的初学者，将不胜感激。
这可能无济于事，但这里也是 AndroidManifest.xml 因为我在某个地方看到我需要设置权限。
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.JurkoAndroidChat"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="16"/>
<application android:label="@string/app_name" android:icon="@drawable/ic_launcher">
<activity android:name="MyActivity"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
</application>
<uses-permission android:name="android.permission.INTERNET" />
</manifest>
package com.example.JurkoAndroidChat;
import android.app.Activity;
import android.content.DialogInterface;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.view.View;
import java.net.*;
import java.io.*;
import java.util.*;
public class MyActivity extends Activity {
/**
* Called when the activity is first created.
*/
// Right here, we connecting the components of the main.xml form to code
Button connectButton, disconnectButton, sendButton;
TextView chatArea, clientArea;
EditText messageField, usernameField, ipField;
//Extra variables and sockets
String username, serverIP;
int Port = 5000;
Socket sock;
PrintWriter out;
BufferedReader in;
ArrayList<String> userList;
Boolean isConnected = false;
ServerTask serverTask;
@Override
public void onCreate(Bundle savedInstanceState) {
System.out.println("Working?");
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
userList = new ArrayList();
connectButton = (Button)findViewById(R.id.button);
sendButton = (Button)findViewById(R.id.button1);
disconnectButton = (Button)findViewById(R.id.button2);
chatArea = (TextView)findViewById(R.id.textView2);
clientArea = (TextView)findViewById(R.id.textView3);
messageField = (EditText)findViewById(R.id.editText2);
usernameField = (EditText)findViewById(R.id.editText);
ipField = (EditText)findViewById(R.id.editText1);
connectButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//To change body of implemented methods use File | Settings | File Templates.
if (isConnected == false) {
username = usernameField.getText().toString();
usernameField.setFocusable(false);
usernameField.setClickable(false);
serverIP = ipField.getText().toString();
ipField.setFocusable(false);
ipField.setClickable(false);
serverTask = new ServerTask();
serverTask.execute();
} else if (isConnected == true) {
chatArea.append("You are already connected to the server.\n");
}
}
});
disconnectButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//To change body of implemented methods use File | Settings | File Templates.
String bye = (username + ": :Disconnect");
try {
out.print(bye);
out.flush();
chatArea.append("Disconnected.\n");
sock.close();
} catch (Exception e) {e.printStackTrace();}
isConnected = false;
usernameField.setFocusable(true);
usernameField.setClickable(true);
ipField.setFocusable(true);
ipField.setClickable(true);
clientArea.setText("");
}
});
sendButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//To change body of implemented methods use File | Settings | File Templates.
String nothing = "";
if ((messageField.getText().toString().equals(nothing))) {
messageField.setText("");
messageField.requestFocus();
} else {
try {
out.println(username + ":" + messageField.getText().toString() + ":" + "Chat");
out.flush();
serverTask.printToStream("hey");
} catch (Exception e) {
chatArea.append("Message was not sent.\n" + e);
}
messageField.setText("");
messageField.requestFocus();
}
}
});
}
public class ServerTask extends AsyncTask<Void, Void, Void> {
@Override
protected Void doInBackground(Void... voids) {
try {
Log.i("Asynctask", "doInBackground");
sock = new Socket(serverIP, Port);
out = new PrintWriter(sock.getOutputStream());
in = new BufferedReader(new InputStreamReader(sock.getInputStream()));
out.println(username + ":" + "has connected." + ":" + "Connect");
out.flush();
isConnected = true;
} catch (Exception ex) {
// chatArea.append("Unable to connect to " + serverIP + " at port " + Port + "." + ex);
// ex.printStackTrace();
// usernameField.setFocusable(true);
// usernameField.setClickable(true);
// ipField.setFocusable(true);
// ipField.setClickable(true);
}
new streamTask().execute();
return null; //To change body of implemented methods use File | Settings | File Templates.
}
public void printToStream(String message) {
try {
out.println(message);
out.flush();
} catch (Exception e) {chatArea.append(e + "\n"); }
}
@Override
protected void onPreExecute() {
super.onPreExecute();
//To change body of overridden methods use File | Settings | File Templates.
}
}
public class streamTask extends AsyncTask<Void, Void, Void> {
@Override
protected Void doInBackground(Void... voids) {
String[] data;
String stream, done = "Done", connect = "Connect", disconnect = "Disconnect", chat = "Chat";
try {
while ((stream = in.readLine()) != null) {
data = stream.split(":");
if (data[2].equals(chat)) {
chatArea.append(data[0] + ": " + data[1] + '\n');
} else if (data[2].equals(connect)) {
chatArea.setText("");
userAdd(data[0]);
} else if (data[2].equals(disconnect)) {
userRemove(data[0]);
} else if (data[2].equals(done)) {
clientArea.setText("");
writeUsers();
userList.clear();
}
}
} catch (Exception e) {e.printStackTrace();}
return null; //To change body of implemented methods use File | Settings | File Templates.
}
}
public void executeTask() {
new ServerTask().execute();
}
public class IncomingReader implements Runnable {
@Override
public void run() {
//To change body of implemented methods use File | Settings | File Templates.
}
}
public void ListenThread() {
Thread IncomingReader = new Thread(new IncomingReader());
IncomingReader.start();
}
public void userAdd(String data) {
userList.add(data);
}
public void userRemove(String data) {
chatArea.append(data + " has disconnected from the server.\n");
for (String token:userList)
if (token.equals(data))
userList.remove(token);
}
public void writeUsers() {
String[] tempList = new String[(userList.size())];
userList.toArray(tempList);
for (String token:tempList) {
clientArea.append(token + '\n');
}
}
}