android集成MQTT（最新）
1 集成MQTT 
implementation 'org.eclipse.paho:org.eclipse.paho.client.mqttv3:1.1.0'
implementation 'org.eclipse.paho:org.eclipse.paho.android.service:1.1.1'
2 添加清单
<service android:name="org.eclipse.paho.android.service.MqttService" /> <!--MqttService-->
<service android:name=".ui.base.MyMqttService" /> <!--MyMqttService-->
3 MyMqttService类
package com.sbas.bigdata.ui.base;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Build;
import android.os.Handler;
import android.os.IBinder;
import android.util.Log;
import android.widget.Toast;
import androidx.annotation.Nullable;
import androidx.annotation.RequiresApi;
import org.eclipse.paho.android.service.MqttAndroidClient;
import org.eclipse.paho.client.mqttv3.IMqttActionListener;
import org.eclipse.paho.client.mqttv3.IMqttDeliveryToken;
import org.eclipse.paho.client.mqttv3.IMqttToken;
import org.eclipse.paho.client.mqttv3.MqttCallback;
import org.eclipse.paho.client.mqttv3.MqttConnectOptions;
import org.eclipse.paho.client.mqttv3.MqttException;
import org.eclipse.paho.client.mqttv3.MqttMessage;
/**
* Created by siboasi on 2021/7/17.
*/
public class MyMqttService extends Service {
@Nullable
@org.jetbrains.annotations.Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
public final String TAG = "tag";
private static MqttAndroidClient mqttAndroidClient;
private MqttConnectOptions mMqttConnectOptions;
public String HOST = "tcp://39.108.103.224:1885";//服务器地址（协议+地址+端口号）
public String USERNAME = "admin";//用户名
public String PASSWORD = "admin";//密码
public static String PUBLISH_TOPIC = "/SS/BSKT/K2100AI/0012346/RX";//发布主题
public static String RESPONSE_TOPIC = "/SS/BSKT/K2100AI/0012346/TX";//响应主题
public String userid = "QQ448656823"; //用户ID，唯一标识符
@RequiresApi(api = Build.VERSION_CODES.O)
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
init();
return super.onStartCommand(intent, flags, startId);
}
/**
* 开启服务
*/
public static void startService(Context mContext) {
mContext.startService(new Intent(mContext, MyMqttService.class));
}
/**
* 发布 （模拟其他客户端发布消息）
*
* @param message 消息
*/
public static void publish(String message) {
String topic = PUBLISH_TOPIC;
Integer qos = 2;
Boolean retained = false;
try {
//参数分别为：主题、消息的字节数组、服务质量、是否在服务器保留断开连接后的最后一条消息
mqttAndroidClient.publish(topic, message.trim().getBytes(), qos.intValue(), retained.booleanValue());
Log.i("tag",PUBLISH_TOPIC +":"+message);
} catch (MqttException e) {
e.printStackTrace();
}
}
/**
* 响应 （收到其他客户端的消息后，响应给对方告知消息已到达或者消息有问题等）
*
* @param message 消息
*/
public void response(String message) {
String topic = RESPONSE_TOPIC;
Integer qos = 2;
Boolean retained = false;
try {
//参数分别为：主题、消息的字节数组、服务质量、是否在服务器保留断开连接后的最后一条消息
mqttAndroidClient.publish(topic, message.getBytes(), qos.intValue(), retained.booleanValue());
} catch (MqttException e) {
e.printStackTrace();
}
}
/**
* 初始化
*/
@RequiresApi(api = Build.VERSION_CODES.O)
private void init() {
String serverURI = HOST; //服务器地址（协议+地址+端口号）
mqttAndroidClient = new MqttAndroidClient(this, serverURI, userid);
mqttAndroidClient.setCallback(mqttCallback); //设置监听订阅消息的回调
mMqttConnectOptions = new MqttConnectOptions();
mMqttConnectOptions.setCleanSession(true); //设置是否清除缓存
mMqttConnectOptions.setConnectionTimeout(60); //设置超时时间，单位：秒
mMqttConnectOptions.setKeepAliveInterval(60); //设置心跳包发送间隔，单位：秒
mMqttConnectOptions.setUserName(USERNAME); //设置用户名
mMqttConnectOptions.setPassword(PASSWORD.toCharArray()); //设置密码
// last will message
boolean doConnect = true;
String disconnect = "{\"disconnect\":\"" + userid + "\"}";
String topic = PUBLISH_TOPIC;
Integer qos = 2;//最好不要为0 可以是1 2
Boolean retained = false;
if ((!disconnect.equals(""))) {
// 断开上一次的连接。没有的话 可以去掉
try {
mMqttConnectOptions.setWill(topic, disconnect.getBytes(), qos.intValue(), retained.booleanValue());
} catch (Exception e) {
Log.i(TAG, "Exception Occured", e);
doConnect = false;
iMqttActionListener.onFailure(null, e);
}
}
if (doConnect) {
doClientConnection();
}
}
/**
* 连接MQTT服务器
*/
private void doClientConnection() {
if (!mqttAndroidClient.isConnected() && isConnectIsNomarl()) {
try {
mqttAndroidClient.connect(mMqttConnectOptions, null, iMqttActionListener);
} catch (MqttException e) {
e.printStackTrace();
}
}
}
/**
* 判断网络是否连接
*/
private boolean isConnectIsNomarl() {
ConnectivityManager connectivityManager = (ConnectivityManager) this.getApplicationContext().getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo info = connectivityManager.getActiveNetworkInfo();
if (info != null && info.isAvailable()) {
String name = info.getTypeName();
Log.i(TAG, "当前网络名称：" + name);
return true;
} else {
Log.i(TAG, "没有可用网络");
/*没有可用网络的时候，延迟3秒再尝试重连*/
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
doClientConnection();
}
}, 3000);
return false;
}
}
//MQTT是否连接成功的监听
private IMqttActionListener iMqttActionListener = new IMqttActionListener() {
@Override
public void onSuccess(IMqttToken arg0) {
Log.i(TAG, "-----------连接成功 ");
try {
mqttAndroidClient.subscribe(RESPONSE_TOPIC, 1);//订阅主题，参数：主题、服务质量 qos最好不要为0
Log.i(TAG, "--------------订阅成功 ");
} catch (MqttException e) {
e.printStackTrace();
}
}
@Override
public void onFailure(IMqttToken arg0, Throwable arg1) {
arg1.printStackTrace();
Log.i(TAG, "连接失败 ");
doClientConnection();//连接失败，重连（可关闭服务器进行模拟）
}
};
//订阅主题的回调
private MqttCallback mqttCallback = new MqttCallback() {
@Override
public void messageArrived(String topic, MqttMessage message) throws Exception {
Log.i(TAG, "收到消息： "+ new String(message.getPayload()) );
//收到其他客户端的消息后，响应给对方告知消息已到达或者消息有问题等 看你的需求，要不要回应。
// response("11111 arrived");
}
@Override
public void deliveryComplete(IMqttDeliveryToken token) {
}
@Override
public void connectionLost(Throwable arg0) {
Log.i(TAG, "连接断开 ");
doClientConnection();//连接断开，重连
}
};
@Override
public void onDestroy() {
try {
mqttAndroidClient.disconnect(); //断开连接
} catch (MqttException e) {
e.printStackTrace();
}
super.onDestroy();
}
}
4 在Activity 启动 MyMqttService
MyMqttService.startService(this); //开启服务
5 在你要发送消息的地方，发布消息给MQTT
MyMqttService.publish(“要发送的消息”);
6 在MyMqttService观察MQTT订阅的消息
