1、导入依赖库:
- implementation 'org.eclipse.paho:org.eclipse.paho.android.service:1.1.1'
- implementation 'org.eclipse.paho:org.eclipse.paho.client.mqttv3:1.2.5'
复制代码 2、功能封装:
- package com.example.mqttdemo;
- import static android.app.Service.START_NOT_STICKY;
- import android.app.Service;
- import android.content.Context;
- import android.content.Intent;
- import android.net.ConnectivityManager;
- import android.net.NetworkInfo;
- import android.os.Handler;
- import android.os.IBinder;
- import android.util.Log;
- import androidx.annotation.Nullable;
- import org.eclipse.paho.android.service.MqttAndroidClient;
- import org.eclipse.paho.client.mqttv3.*;
- public class MyMqttService extends Service {
- public final static String TAG = MyMqttService.class.getSimpleName();
- public static MqttAndroidClient mqttAndroidClient;
- private static MqttConnectOptions mMqttConnectOptions;
- public static String HOST = "tcp://broker.hivemq.com:1883";//服务器地址(协议+地址+端口号)
- public String USERNAME = "";//用户名
- public String PASSWORD = "";//密码
- public static String PUBLISH_TOPIC = "/d";//发布主题
- public static String RESPONSE_TOPIC = "v";//响应主题
- public String CLIENTID = "CLIENTID";//设备唯一标识
- @Override
- public int onStartCommand(Intent intent, int flags, int startId) {
- init();
- return START_NOT_STICKY;//非粘性的 service强制杀死后,不会尝试重新启动service
- }
- @Nullable
- @Override
- public IBinder onBind(Intent intent) {
- return null;
- }
- /**
- * 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 = 1;
- 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();
- }
- }
- /**
- * 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 static void response(String message) {
- String topic = RESPONSE_TOPIC;
- Integer qos = 1;
- 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
- */
- private void init() {
- String serverURI = HOST; //服务器地址(协议+地址+端口号)
- Log.i(TAG, "初始化MQ" + serverURI);
- if (mqttAndroidClient == null) {
- mqttAndroidClient = new MqttAndroidClient(this, serverURI, CLIENTID);
- mqttAndroidClient.setCallback(mqttCallback); //设置监听订阅消息的回调
- }
- if (mMqttConnectOptions == null) {
- mMqttConnectOptions = new MqttConnectOptions();
- mMqttConnectOptions.setCleanSession(true); //设置是否清除缓存
- mMqttConnectOptions.setConnectionTimeout(10); //设置超时时间,单位:秒
- mMqttConnectOptions.setKeepAliveInterval(20); //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 message = "{"terminal_uid":"" + CLIENTID + ""}";
- String topic = PUBLISH_TOPIC;
- Integer qos = 1;
- Boolean retained = true;
- if ((!message.equals("")) || (!topic.equals(""))) {
- // 最后的遗嘱
- try {
- mMqttConnectOptions.setWill(topic, message.getBytes(), qos.intValue(), retained.booleanValue());
- } catch (Exception e) {
- Log.i(TAG, "Exception Occured");
- doConnect = false;
- iMqttActionListener.onFailure(null, e);
- }
- }
- if (doConnect) {
- doClientConnection();
- }
- }
- /**
- * 连接MQTT服务器
- */
- private static void doClientConnection() {
- try {
- if (!mqttAndroidClient.isConnected() && isConnectIsNomarl()) {
- Log.i(TAG, "连接MQTT服务器" + HOST);
- mqttAndroidClient.connect(mMqttConnectOptions, null, iMqttActionListener);
- }
- } catch (Exception e) {
- e.printStackTrace();
- }
- }
- /**
- * 判断网络是否连接
- */
- private static boolean isConnectIsNomarl() {
- return true;
- // ConnectivityManager connectivityManager = (ConnectivityManager) BaseApplication.getInstance().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() {
- // Log.i(TAG, "没有可用网络doClientConnection");
- // doClientConnection();
- // }
- // }, 3000);
- // return false;
- // }
- }
- //MQTT是否连接成功的监听
- private static IMqttActionListener iMqttActionListener = new IMqttActionListener() {
- @Override
- public void onSuccess(IMqttToken arg0) {
- Log.i(TAG, "连接成功 " + HOST);
- try {
- if (mqttAndroidClient != null) {
- mqttAndroidClient.subscribe(PUBLISH_TOPIC, 1);//订阅主题,参数:主题、服务质量
- }
- } catch (Exception 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 msgStr) throws Exception {
- try {
- String enCodeMsg = new String(msgStr.getPayload());
- Log.i(TAG, "收到消息: " + enCodeMsg);
- //收到消息,这里弹出Toast表示。如果需要更新UI,可以使用广播或者EventBus进行发送
- //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
- response("message arrived");
- } catch (Exception e) {
- e.printStackTrace();
- }
- }
- @Override
- public void deliveryComplete(IMqttDeliveryToken arg0) {
- }
- @Override
- public void connectionLost(Throwable arg0) {
- Log.i(TAG, "连接断开 ");
- doClientConnection();//连接断开,重连
- }
- };
- public static void disconnect(Context context) {
- try {
- if (mqttAndroidClient != null && mqttAndroidClient.isConnected()) {
- mqttAndroidClient.unsubscribe(PUBLISH_TOPIC);
- mqttAndroidClient.unregisterResources();
- mqttAndroidClient.disconnect(0); //断开连接
- mqttAndroidClient = null;
- context.stopService(new Intent(context, MyMqttService.class));
- }
- } catch (Exception e) {
- e.printStackTrace();
- }
- }
- }
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