1. 服务器端 - ChatServer.java
import java.io.*;
import java.net.*;
import java.util.*;
public class ChatServer {
private static final int PORT = 8080;
private static Set<PrintWriter> clientWriters = new HashSet<>();
public static void main(String[] args) {
System.out.println("聊天服务器启动中...");
try (ServerSocket serverSocket = new ServerSocket(PORT)) {
System.out.println("服务器已启动，监听端口
: " + PORT);
while (true) {
new ClientHandler(serverSocket.accept()).start();
}
} catch (IOException e) {
System.out.println("服务器异常
: " + e.getMessage());
}
}
private static class ClientHandler extends Thread {
private Socket socket;
private PrintWriter out;
private BufferedReader in;
private String nickname; // 存储实际昵称
public ClientHandler(Socket socket) {
this.socket = socket;
}
public void run() {
try {
in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
out = new PrintWriter(socket.getOutputStream(), true);
// 读取客户端发送的第一条消息作为昵称
nickname = in.readLine();
if (nickname == null || nickname.trim().isEmpty()) {
nickname = "匿名用户";
}
synchronized (clientWriters) {
clientWriters.add(out);
}
// 使用实际昵称广播加入消息
System.out.println(nickname + " 加入了聊天室");
broadcastSystemMessage(nickname + " 加入了聊天室");
String message;
while ((message = in.readLine()) != null) {
System.out.println("收到消息
: " + message);
broadcastMessage(message, out);
}
} catch (IOException e) {
System.out.println("客户端断开
: " + e.getMessage());
} finally {
try {
socket.close();
} catch (IOException e) {
// 忽略
}
synchronized (clientWriters) {
clientWriters.remove(out);
}
// 使用实际昵称广播退出消息
if (nickname != null) {
System.out.println(nickname + " 离开了聊天室");
broadcastSystemMessage(nickname + " 离开了聊天室");
}
}
}
private void broadcastMessage(String message, PrintWriter senderWriter) {
synchronized (clientWriters) {
for (PrintWriter writer
: clientWriters) {
if (writer != senderWriter) {
writer.println(message);
}
}
}
}
private void broadcastSystemMessage(String message) {
long timestamp = System.currentTimeMillis();
String systemMessage = "系统|" + message + "|" + timestamp;
synchronized (clientWriters) {
for (PrintWriter writer
: clientWriters) {
writer.println(systemMessage);
}
}
}
}
}
2.
Android客户端
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns
:android="http
://schemas.
android.com/apk/res/
android"
package="com.example.myapplication">
<uses-permission
android:name="
android.permission.INTERNET" />
<uses-permission
android:name="
android.permission.ACCESS_NETWORK_STATE" />
<uses-permission
android:name="
android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission
android:name="
android.permission.READ_EXTERNAL_STORAGE" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="骆树涛群聊"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/Theme.AppCompat.Light.NoActionBar">
<activity
android:name=".MainActivity"
android:exported="true">
<intent-filter>
<action
android:name="
android.intent.action.MAIN" />
<category
android:name="
android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".ChatActivity" />
<activity
android:name=".SettingsActivity" />
</application>
</manifest>
arrays.xml代码
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string-array name="color_entries">
<item>黑色</item>
<item>红色</item>
<item>黄色</item>
<item>蓝色</item>
<item>绿色</item>
</string-array>
<string-array name="color_values">
<item>#FF000000</item>
<item>#FFFF0000</item>
<item>#FFFFFF00</item>
<item>#FF0000FF</item>
<item>#FF00FF00</item>
</string-array>
<string-array name="bg_entries">
<item>科技</item>
<item>书籍</item>
<item>简约</item>
</string-array>
<string-array name="bg_values">
<item>bg_books</item>
<item>bg_nature</item>
<item>bg_simple</item>
</string-array>
</resources>
Srimg.xml代码
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns
:android="http
://schemas.
android.com/apk/res/
android">
<EditTextPreference
android:key="font_size"
android:title="字号设置"
android:summary="输入文字大小(单位
:sp)"
android:dialogTitle="设置字号"
android:defaultValue="15"
android:inputType="number"/>
<ListPreference
android:key="text_color"
android:title="文字颜色"
android:summary="选择文字显示颜色"
android:dialogTitle="选择颜色"
android:defaultValue="#FF000000"
android:entries="@array/color_entries"
android:entryValues="@array/color_values"/>
<ListPreference
android:key="bg"
android:title="聊天背景"
android:summary="选择聊天背景图片"
android:dialogTitle="选择背景"
android:entries="@array/bg_entries"
android:entryValues="@array/bg_values"
android:defaultValue="bg_tech"/>
</PreferenceScreen>
ChatMessage.java
package com.example.myapplication;
public class ChatMessage {
private String nickname;
private String message;
private long timestamp;
private boolean isSelf;
public ChatMessage(String nickname, String message, long timestamp, boolean isSelf) {
this.nickname = nickname;
this.message = message;
this.timestamp = timestamp;
this.isSelf = isSelf;
}
public String getNickname() { return nickname; }
public String getMessage() { return message; }
public long getTimestamp() { return timestamp; }
public boolean isSelf() { return isSelf; }
}
ChatAdapter.java
package com.example.myapplication;
import
android.content.Context;
import
android.content.SharedPreferences;
import
android.graphics.Color;
import
android.util.TypedValue;
import
android.view.
LayoutInflater;
import
android.view.View;
import
android.view.ViewGroup;
import
android.widget.TextView;
import
androidx.annotation.NonNull;
import
androidx.preference.PreferenceManager;
import
androidx.recyclerview.widget.RecyclerView;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.Locale;
public class ChatAdapter extends RecyclerView.Adapter<ChatAdapter.MessageViewHolder> {
private List<ChatMessage> messages;
private Context context;
public ChatAdapter(List<ChatMessage> messages, Context context) {
this.messages = messages;
this.context = context;
}
@Override
public int getItemViewType(int position) {
return messages.get(position).isSelf() ? 1
: 0;
}
@NonNull
@Override
public MessageViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
LayoutInflater inflater =
LayoutInflater.from(parent.getContext());
View view;
if (viewType == 1) {
view = inflater.inflate(R.
layout.message_item_self, parent, false);
} else {
view = inflater.inflate(R.
layout.message_item, parent, false);
}
return new MessageViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull MessageViewHolder holder, int position) {
ChatMessage message = messages.get(position);
holder.messageText.setText(message.getMessage());
holder.nicknameText.setText(message.getNickname());
// 格式化时间
SimpleDateFormat sdf = new SimpleDateFormat("HH
:mm", Locale.getDefault());
holder.timeText.setText(sdf.format(new Date(message.getTimestamp())));
// 应用设置 - 特别处理自己消息的颜色
applySettings(holder, message.isSelf());
}
private void applySettings(MessageViewHolder holder, boolean isSelf) {
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
// 设置字号
float fontSize = Float.parseFloat(prefs.getString("font_size", "15"));
holder.messageText.setTextSize(TypedValue.COMPLEX_UNIT_SP, fontSize);
holder.nicknameText.setTextSize(TypedValue.COMPLEX_UNIT_SP, fontSize - 2);
holder.timeText.setTextSize(TypedValue.COMPLEX_UNIT_SP, fontSize - 4);
// 设置文字颜色 - 自己消息使用特殊颜色
String colorValue;
if (isSelf) {
// 自己消息使用固定颜色，确保可读性
colorValue = "#FF000000"; // 黑色
} else {
colorValue = prefs.getString("text_color", "#FF000000");
}
holder.messageText.setTextColor(Color.parseColor(colorValue));
holder.nicknameText.setTextColor(Color.parseColor(colorValue));
holder.timeText.setTextColor(Color.parseColor(colorValue));
}
@Override
public int getItemCount() {
return messages.size();
}
static class MessageViewHolder extends RecyclerView.ViewHolder {
TextView nicknameText, messageText, timeText;
public MessageViewHolder(@NonNull View itemView) {
super(itemView);
nicknameText = itemView.findViewById(R.id.nickname);
messageText = itemView.findViewById(R.id.message);
timeText = itemView.findViewById(R.id.time);
}
}
}
MainActivity.java
package com.example.myapplication;
import
android.content.Intent;
import
android.content.SharedPreferences;
import
android.os.Bundle;
import
android.preference.PreferenceManager;
import
android.widget.Button;
import
android.widget.EditText;
import
androidx.appcompat.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity {
private static final int SETTINGS_REQUEST = 1;
private EditText nicknameEditText;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.
layout.activity_main);
nicknameEditText = findViewById(R.id.nickname_edit_text);
Button enterChatButton = findViewById(R.id.enter_chat_button);
Button settingsButton = findViewById(R.id.settings_button);
// 从SharedPreferences加载保存的昵称
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
String savedNickname = prefs.getString("nickname", "");
nicknameEditText.setText(savedNickname);
enterChatButton.setOnClickListener(v -> {
// 保存昵称到SharedPreferences
String nickname = nicknameEditText.getText().toString().trim();
if (nickname.isEmpty()) {
nickname = "匿名用户";
}
SharedPreferences.Editor editor = prefs.edit();
editor.putString("nickname", nickname);
editor.apply();
// 启动聊天室
Intent intent = new Intent(MainActivity.this, ChatActivity.class);
startActivity(intent);
});
settingsButton.setOnClickListener(v ->
startActivityForResult(
new Intent(MainActivity.this, SettingsActivity.class),
SETTINGS_REQUEST));
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == SETTINGS_REQUEST &&
resultCode == SettingsActivity.RESULT_SETTINGS_CHANGED) {
// 设置已更改，更新主界面背景
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
String bgKey = prefs.getString("bg", "bg_tech");
int bgResId = getResources().getIdentifier(bgKey, "drawable", getPackageName());
if (bgResId != 0) {
findViewById(
android.R.id.content).setBackgroundResource(bgResId);
}
}
}
}
SettingsActivity.java
package com.example.myapplication;
import
android.os.Bundle;
import
androidx.appcompat.app.AppCompatActivity;
public class SettingsActivity extends AppCompatActivity {
public static final int RESULT_SETTINGS_CHANGED = 1001;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.
layout.activity_settings);
getSupportFragmentManager()
.beginTransaction()
.replace(R.id.settings_container, new SettingsFragment())
.commit();
}
}
SettingsFragment.java
package com.example.myapplication;
import
android.content.SharedPreferences;
import
android.os.Bundle;
import
androidx.preference.PreferenceFragmentCompat;
public class SettingsFragment extends PreferenceFragmentCompat
implements SharedPreferences.OnSharedPreferenceChangeListener {
@Override
public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
setPreferencesFromResource(R.xml.sring, rootKey);
}
@Override
public void onResume() {
super.onResume();
getPreferenceManager().getSharedPreferences()
.registerOnSharedPreferenceChangeListener(this);
}
@Override
public void onPause() {
super.onPause();
getPreferenceManager().getSharedPreferences()
.unregisterOnSharedPreferenceChangeListener(this);
}
@Override
public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
// 设置变更时通知ChatActivity刷新
if (getActivity() != null) {
getActivity().setResult(SettingsActivity.RESULT_SETTINGS_CHANGED);
}
}
}
ChatActivity.java
package com.example.myapplication;
import
android.content.SharedPreferences;
import
android.os.Bundle;
import
android.preference.PreferenceManager;
import
android.widget.Button;
import
android.widget.EditText;
import
android.widget.Toast;
import
androidx.appcompat.app.AppCompatActivity;
import
androidx.recyclerview.widget.Linear
LayoutManager;
import
androidx.recyclerview.widget.RecyclerView;
import java.io.*;
import java.net.Socket;
import java.util.ArrayList;
import java.util.List;
public class ChatActivity extends AppCompatActivity {
private static final String SERVER_IP = "192.168.199.1"; // 模拟器访问本机
private static final int SERVER_PORT = 8080;
private RecyclerView chatRecyclerView;
private EditText messageEditText;
private Button sendButton;
private ChatAdapter adapter;
private List<ChatMessage> messages = new ArrayList<>();
private PrintWriter out;
private BufferedReader in;
private Socket socket;
private String nickname;
private SharedPreferences prefs;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.
layout.activity_chat);
// 从SharedPreferences获取昵称
prefs = PreferenceManager.getDefaultSharedPreferences(this);
nickname = prefs.getString("nickname", "匿名用户");
setupUI();
loadChatHistory();
connectToServer();
}
@Override
protected void onResume() {
super.onResume();
// 重新应用设置（从设置页面返回时）
applyBackgroundSettings();
if (adapter != null) {
adapter.notifyDataSetChanged(); // 刷新消息显示
}
}
private void setupUI() {
chatRecyclerView = findViewById(R.id.chat_recycler_view);
messageEditText = findViewById(R.id.message_edit_text);
sendButton = findViewById(R.id.send_button);
adapter = new ChatAdapter(messages, this);
chatRecyclerView.setAdapter(adapter);
chatRecyclerView.set
LayoutManager(new Linear
LayoutManager(this));
applyBackgroundSettings(); // 初始应用背景设置
sendButton.setOnClickListener(v -> sendMessage());
}
private void applyBackgroundSettings() {
String bgKey = prefs.getString("bg", "bg_tech");
int bgResId = getResources().getIdentifier(bgKey, "drawable", getPackageName());
if (bgResId != 0) {
chatRecyclerView.setBackgroundResource(bgResId);
}
}
private void loadChatHistory() {
File file = new File(getExternalFilesDir(null), "luoshutao.txt");
if (file.exists()) {
try (BufferedReader reader = new BufferedReader(new FileReader(file))) {
String line;
while ((line = reader.readLine()) != null) {
String[] parts = line.split("\\|");
if (parts.length == 4) {
boolean isSelf = Boolean.parseBoolean(parts[3]);
messages.add(new ChatMessage(parts[0], parts[1], Long.parseLong(parts[2]), isSelf));
}
}
adapter.notifyDataSetChanged();
chatRecyclerView.scrollToPosition(messages.size() - 1);
} catch (IOException e) {
e.printStackTrace();
}
}
}
private void saveChatMessage(ChatMessage message) {
File file = new File(getExternalFilesDir(null), "luoshutao.txt");
try (FileWriter writer = new FileWriter(file, true)) {
writer.write(String.format("%s|%s|%d|%b\n",
message.getNickname(),
message.getMessage(),
message.getTimestamp(),
message.isSelf()));
} catch (IOException e) {
e.printStackTrace();
}
}
private void connectToServer() {
new Thread(() -> {
try {
socket = new Socket(SERVER_IP, SERVER_PORT);
out = new PrintWriter(socket.getOutputStream(), true);
in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
out.println(nickname);
// 监听服务器消息
String serverMessage;
while ((serverMessage = in.readLine()) != null) {
if (isSystemJoinLeaveMessage(serverMessage)) {
continue; // 跳过不显示
}
// 解析服务器消息：格式为 "昵称|消息|时间戳"
String[] parts = serverMessage.split("\\|", 3);
if (parts.length == 3) {
final ChatMessage message = new ChatMessage(
parts[0],
parts[1],
Long.parseLong(parts[2]),
false
);
runOnUiThread(() -> {
messages.add(message);
adapter.notifyItemInserted(messages.size() - 1);
chatRecyclerView.scrollToPosition(messages.size() - 1);
saveChatMessage(message);
});
}
}
} catch (IOException e) {
runOnUiThread(() -> Toast.makeText(ChatActivity.this,
"服务器连接失败
: " + e.getMessage(), Toast.LENGTH_LONG).show());
}
}).start();
}
private boolean isSystemJoinLeaveMessage(String message) {
return message.contains("加入了聊天室") || message.contains("离开了聊天室");
}
private void sendMessage() {
String messageText = messageEditText.getText().toString().trim();
if (!messageText.isEmpty()) {
long timestamp = System.currentTimeMillis();
final ChatMessage message = new ChatMessage(nickname, messageText, timestamp, true);
// 添加到UI
runOnUiThread(() -> {
messages.add(message);
adapter.notifyItemInserted(messages.size() - 1);
chatRecyclerView.scrollToPosition(messages.size() - 1);
saveChatMessage(message);
});
// 发送到服务器
new Thread(() -> {
if (out != null) {
out.println(nickname + "|" + messageText + "|" + timestamp);
}
}).start();
messageEditText.setText("");
}
}
@Override
protected void onDestroy() {
super.onDestroy();
try {
if (socket != null) socket.close();
if (out != null) out.close();
if (in != null) in.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<Linear
Layout xmlns
:android="http
://schemas.
android.com/apk/res/
android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:gravity="center"
android:padding="16dp"
android:background="@drawable/bg_tech">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="骆树涛聊天室"
android:textSize="40sp"
android:layout_gravity="center"
android:layout_marginBottom="16dp"
android:textStyle="bold"
android:textColor="#2196F3"/>
<!-- 昵称设置区域 -->
<Linear
Layout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:gravity="center_vertical"
android:layout_marginBottom="16dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="昵称
:"
android:textSize="25sp"
android:layout_
marginEnd="8dp"/>
<EditText
android:id="@+id/nickname_edit_text"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:hint="请输入昵称"
android:textSize="25sp"
android:maxLines="1"/>
</Linear
Layout>
<Button
android:id="@+id/enter_chat_button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="进入聊天室"
android:layout_marginBottom="16dp"/>
<Button
android:id="@+id/settings_button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="设置"/>
</Linear
Layout>
activity_chat.xml
<?xml version="1.0" encoding="utf-8"?>
<Linear
Layout xmlns
:android="http
://schemas.
android.com/apk/res/
android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<
androidx.recyclerview.widget.RecyclerView
android:id="@+id/chat_recycler_view"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:scrollbars="vertical"/>
<Linear
Layout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:padding="8dp">
<EditText
android:id="@+id/message_edit_text"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:hint="输入消息"
android:inputType="textMultiLine"
android:maxLines="3"/>
<Button
android:id="@+id/send_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="发送"/>
</Linear
Layout>
</Linear
Layout>
activity_settings.xml
<?xml version="1.0" encoding="utf-8"?>
<Frame
Layout xmlns
:android="http
://schemas.
android.com/apk/res/
android"
android:id="@+id/settings_container"
android:layout_width="match_parent"
android:layout_height="match_parent" />
message_item.xml
<?xml version="1.0" encoding="utf-8"?>
<Linear
Layout xmlns
:android="http
://schemas.
android.com/apk/res/
android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:padding="8dp"
android:layout_marginTop="4dp"
android:layout_
marginEnd="60dp">
<Linear
Layout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:gravity="center_vertical">
<TextView
android:id="@+id/nickname"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="12sp"/>
<TextView
android:id="@+id/time"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="10sp"
android:layout_marginStart="8dp"/>
</Linear
Layout>
<TextView
android:id="@+id/message"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/bubble_other"
android:padding="8dp"/>
</Linear
Layout>
message_item_self.xml
<?xml version="1.0" encoding="utf-8"?>
<Linear
Layout xmlns
:android="http
://schemas.
android.com/apk/res/
android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:padding="8dp"
android:layout_marginTop="4dp"
android:layout_marginStart="60dp"
android:gravity="end">
<Linear
Layout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:gravity="center_vertical">
<TextView
android:id="@+id/time"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="10sp"
android:layout_
marginEnd="8dp"/>
<TextView
android:id="@+id/nickname"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="12sp"/>
</Linear
Layout>
<TextView
android:id="@+id/message"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/bg_books"
android:padding="8dp"/>
</Linear
Layout>
本文深入解析了Android 4.2 SDK版本17中新增的RTL布局支持特性，旨在帮助开发者更好地适配阿拉伯语和波斯语等从右至左阅读习惯的语言。详细介绍了如何在AndroidManifest.xml中启用supportsRtl属性，并强调了为避免布局混乱，在XML布局中应使用layout_marginEnd而非layout_marginRight。同时，文章指出了当系统语言设置为阿拉伯语时，actionbar布局未能自动转换为RTL的问题及解决方案。
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