参考：
(61条消息) android接入简单的websocket步骤,建立一个长连接（带心跳检测）从服务器端接收消息_白马镇的少年的博客-CSDN博客_android websocket长连接
服务端：
springboot使用websocket创建长连接 - 简书 (jianshu.com)
代码
具体业务逻辑在接受消息的回调那里，需要修改代码中连接服务端的websocket地址。
package com.example.xy.service;
import android.app.Application;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.os.Handler;
import android.os.IBinder;
import android.util.Log;
import androidx.annotation.Nullable;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONException;
import com.alibaba.fastjson.JSONObject;
import com.example.xy.BaseApp;
import com.example.xy.domain.MsgEventBean;
import com.example.xy.utils.AppSharedPreferences;
import com.example.xy.utils.Constant;
import org.greenrobot.eventbus.EventBus;
import java.io.IOException;
import java.net.UnknownHostException;
import java.util.concurrent.TimeUnit;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
import okhttp3.WebSocket;
import okhttp3.WebSocketListener;
import okio.ByteString;
public class BackService extends Service {
public Application application;
public Context context;
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
private InitSocketThread thread;
@Override
public void onCreate() {
super.onCreate();
if (mWebSocket != null) {
mWebSocket.close(1000, null);
}
new InitSocketThread().start();
application= BaseApp.getApp();//这个是application，需要在功能清单里面的--android:name=".main.app.TzApplication"
context=BaseApp.getApp();
Log.e("TAG","onCreate------------*************-------------");
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
return super.onStartCommand(intent, flags, startId);
}
/**
* 心跳检测时间
*/
private static final long HEART_BEAT_RATE = 10 * 1000;//每隔10秒进行一次对长连接的心跳检测
private final String WEBSOCKET_HOST_AND_PORT = Constant.TEST_WEBSOCKET + "/webSocket/" + AppSharedPreferences.getInstance(context).getInt("userId");//可替换为自己的主机名和端口号
private WebSocket mWebSocket;
// 初始化socket
private void initSocket() throws UnknownHostException, IOException {
OkHttpClient client = new OkHttpClient.Builder().readTimeout(0, TimeUnit.MILLISECONDS).build();
Request request = new Request.Builder().url(WEBSOCKET_HOST_AND_PORT).build();
client.newWebSocket(request, new WebSocketListener() {
@Override
public void onOpen(WebSocket webSocket, Response response) {//开启长连接成功的回调
super.onOpen(webSocket, response);
mWebSocket = webSocket;
}
@Override
public void onMessage(WebSocket webSocket, String text) {//接收消息的回调
super.onMessage(webSocket, text);
//收到服务器端传过来的消息text
Log.e("TAG", "接收消息的回调--------------"+text);
try {
//这个是解析你的回调数据
JSONObject jsonObject = JSON.parseObject(text);
//通过事件总线修改
String type = jsonObject.getString("type");
String title = jsonObject.getString("title");
String createTime = jsonObject.getString("createTime");
MsgEventBean bean = new MsgEventBean(); //自定义对象
switch (type){
case "1": //系统消息
bean.type = 1;
bean.content = title;
bean.time = createTime;
EventBus.getDefault().post(bean);
break;
case "2": //互动消息
bean.type = 2;
bean.content = title;
bean.time = createTime;
EventBus.getDefault().post(bean);
break;
}
} catch (JSONException e) {
e.printStackTrace();
}
}
@Override
public void onMessage(WebSocket webSocket, ByteString bytes) {
super.onMessage(webSocket, bytes);
}
@Override
public void onClosing(WebSocket webSocket, int code, String reason) {
super.onClosing(webSocket, code, reason);
}
@Override
public void onClosed(WebSocket webSocket, int code, String reason) {
super.onClosed(webSocket, code, reason);
}
@Override
public void onFailure(WebSocket webSocket, Throwable t, @Nullable Response response) {//长连接连接失败的回调
super.onFailure(webSocket, t, response);
}
});
client.dispatcher().executorService().shutdown();
mHandler.postDelayed(heartBeatRunnable, HEART_BEAT_RATE);//开启心跳检测
}
class InitSocketThread extends Thread {
@Override
public void run() {
super.run();
try {
initSocket();
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
private long sendTime = 0L;
// 发送心跳包
private Handler mHandler = new Handler();
private Runnable heartBeatRunnable = new Runnable() {
@Override
public void run() {
if (System.currentTimeMillis() - sendTime >= HEART_BEAT_RATE) {
if(mWebSocket!=null) {
boolean isSuccess = mWebSocket.send("android-心跳");//发送一个消息给服务器，通过发送消息的成功失败来判断长连接的连接状态
if (!isSuccess) {//长连接已断开，
Log.e("TAG", "发送心跳包-------------长连接已断开");
mHandler.removeCallbacks(heartBeatRunnable);
mWebSocket.cancel();//取消掉以前的长连接
new InitSocketThread().start();//创建一个新的连接
} else {//长连接处于连接状态---
Log.e("TAG", "发送心跳包-------------长连接处于连接状态");
}
}
sendTime = System.currentTimeMillis();
}
mHandler.postDelayed(this, HEART_BEAT_RATE);//每隔一定的时间，对长连接进行一次心跳检测
}
};
//关闭长连接
@Override
public void onDestroy() {
super.onDestroy();
if (mWebSocket != null) {
mWebSocket.close(1000, null);
}
}
}
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