MQTT EMQ-Cloud 的Android客户端连接测试

三大块: 配置, 服务, 主程序

  • MqttConfig
  • MqttService
  • MainActivity
  1. MQTT库 / AndroidManifest.xml
implementation 'org.eclipse.paho:org.eclipse.paho.client.mqttv3:1.2.5'//版本号很多,随便选一个
implementation 'org.eclipse.paho:org.eclipse.paho.android.service:1.1.1' 
implementation 'androidx.localbroadcastmanager:localbroadcastmanager:1.0.0'//如果Broadcastmanager报错加这个
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
  1. 配置类: MqttConfig
public class MqttConfig {

    private String serverURL;
    private String userName;
    private String passWord;
    private String topic;
    private String clientID;

    public String getServerURL() {
        return serverURL;
    }

    public void setServerURL(String serverURL) {
        this.serverURL = serverURL;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getPassWord() {
        return passWord;
    }

    public void setPassWord(String passWord) {
        this.passWord = passWord;
    }

    public String getTopic() {
        return topic;
    }

    public void setTopic(String topic) {
        this.topic = topic;
    }

    public String getClientID() {
        return clientID;
    }

    public void setClientID(String clientID) {
        this.clientID = clientID;
    }

    public MqttConfig(String serverURL, String userName, String passWord, String topic, String clientID) {
        this.serverURL = serverURL;
        this.userName = userName;
        this.passWord = passWord;
        this.topic = topic;
        this.clientID = clientID;
    }

    @Override
    public String toString() {
        return "MqttConfig{" +
                "serverURL='" + serverURL + '\'' +
                ", userName='" + userName + '\'' +
                ", passWord='" + passWord + '\'' +
                ", topic='" + topic + '\'' +
                ", clientID='" + clientID + '\'' +
                '}';
    }
}

  1. MqttService
import ...

public class MyMqttService extends Service {
    private static final String TAG = "testOfMqttService";

    private MqttConfig mqttConfig;
    private MqttAndroidClient client;
    private MqttConnectOptions options;

     /*
     * Start Service
     */

    public static void startService(Context mContext) {
        mContext.startService(new Intent(mContext, MyMqttService.class));
        Log.d(TAG, "startService: Service startService");
    }


    @Override
    public void onCreate() {
        super.onCreate();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        /*
        * Initialize Mqtt Config
        */
        Log.d(TAG, "onCreate: Service initMqtt");
        initMqtt();
        return super.onStartCommand(intent, flags, startId);
    }

    private void initMqtt() {

         /*
         * Main Mqtt Config
         */

        mqttConfig = new MqttConfig(
                "tcp://broker.emqx.io:1883", //换自己的地址, 记得加tcp://
                "emq", 
                "public",
                "AndroidTest",
                "Android"
        );

         /*
         * Set connection options
         */

        options = new MqttConnectOptions();
        options.setCleanSession(true);
        options.setUserName(mqttConfig.getUserName());
        options.setPassword(mqttConfig.getPassWord().toCharArray());
        options.setConnectionTimeout(10);
        options.setKeepAliveInterval(60);

         /*
         * Create and configure the client
         */

        client = new MqttAndroidClient(this, mqttConfig.getServerURL(), mqttConfig.getClientID());
        client.setCallback(new MqttCallback() {
            @Override
            public void connectionLost(Throwable cause) {
                // will do after lost(reconnect)
                Log.d(TAG, "connectionLost: Service");
                Log.d(TAG, "connectionLost " + cause.getMessage());
            }

            @Override
            public void messageArrived(String topic, MqttMessage message) throws Exception {
                // will do after messageArrived
                Log.d(TAG, "messageArrived: Service");
                Log.d(TAG, "Topic: " + topic + "messageArrived: " + new String(message.getPayload()));
            }

            @Override
            public void deliveryComplete(IMqttDeliveryToken token) {
                // will do after publish
                Log.d(TAG, "deliveryComplete: Service");
                Log.d(TAG, "deliveryComplete: " + token.toString());
            }
        });

        boolean doConnect = true;
        
        if (doConnect) {
            mqttConnect();
        }
    }

    // MQTT connection listener
    private IMqttActionListener iMqttActionListener = new IMqttActionListener() {
        @Override
        public void onSuccess(IMqttToken asyncActionToken) {
            try {
                // subscribe topic
                client.subscribe(mqttConfig.getTopic(),2);
                Log.d(TAG, "onSuccess: Service MQTT connection succeed");
            } catch (MqttException e) {
                e.printStackTrace();
            }
        }

        @Override
        public void onFailure(IMqttToken asyncActionToken, Throwable exception) {
            Log.d(TAG, "onFailure: Service MQTT connection failed");
            //reconnect
        }
    };

    private void mqttConnect() {

        try {
            Log.d(TAG, "mqttConnect: Service try to connect");
            client.connect(options, null, iMqttActionListener);
        } catch (MqttException e) {
            Log.d(TAG, "mqttConnect: Service try to connect failed");
            e.printStackTrace();
        }
    }

    @Override
    public void onDestroy() {
        Log.d(TAG, "onDestroy: Service");
        super.onDestroy();
    }

    @Override
    public IBinder onBind(Intent intent) {
//        // TODO: Return the communication channel to the service.
//        throw new UnsupportedOperationException("Not yet implemented");
        return null;
    }
}


  1. MainActivity
import ...

public class MainActivity extends AppCompatActivity {

    private static final String TAG = "testOfMain" ;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Log.d(TAG, "onCreate: Main");
    }

    @Override
    protected void onStart() {
        super.onStart();
        setContentView(R.layout.activity_main);

        /*Start Service*/
        Log.d(TAG, "onCreate: Main starts Service");
        MyMqttService.startService(this);
    }
}

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