mqtt apk 使用org.eclipse.paho.client.mqttv3

1.build.gradle

allprojects {
    repositories {
        google()
        jcenter()
        maven {
            url "https://repo.eclipse.org/content/repositories/paho-snapshots/"
        }
        
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test:runner:1.2.0'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
    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.pubsub client

public class Mqtt1Activity extends AppCompatActivity implements View.OnClickListener, CompoundButton.OnCheckedChangeListener {
    private EditText mTopicPub;
    private EditText mTopicSub;
    private EditText mMessageSub;
    private EditText mMessagePub;
    private EditText mQoSPub;
    private EditText mQoSub;
    private Button mPublish;
    private Button mSubscribe;
    private Switch mRetain;
    private String TAG = "hanchd";



    public static final String HOST = "tcp://test.mosquitto.org:1883";
    private static final String clientid = "hancclientid";

    private MqttClient mMqttClient;
    private boolean isRetain;



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_mqtt1);
        mTopicPub=findViewById(R.id.et_topic_pub);
        mTopicSub=findViewById(R.id.et_topic_sub);
        mMessageSub=findViewById(R.id.et_message_sub);
        mMessagePub=findViewById(R.id.et_message_pub);
        mQoSPub=findViewById(R.id.et_QoS_pub);
        mQoSub=findViewById(R.id.et_QoS_sub);
        mPublish=findViewById(R.id.btn_pub);
        mSubscribe=findViewById(R.id.btn_sub);
        mRetain=findViewById(R.id.switch_retain);

        mPublish.setOnClickListener(this);
        mSubscribe.setOnClickListener(this);
        mRetain.setOnCheckedChangeListener(this);

        try {
            mMqttClient = new MqttClient(HOST, clientid, new MemoryPersistence());
        } catch (MqttException e) {
            e.printStackTrace();
        }
        connect();

    }
    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        if (isChecked) {
            isRetain =  isChecked;
        } else {
            isRetain =  isChecked;
        }

    }
    @Override
    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.btn_pub:
                publish();
                break;
            case R.id.btn_sub:
                subscribe();
                break;

            default:
                break;
        }

    }

    private void publish() {
        MqttMessage  mqttMessage= new MqttMessage();
        mqttMessage.setQos( Integer.parseInt(mQoSPub.getText().toString()));//
        //messagePub.setQos(1);//
        mqttMessage.setRetained(isRetain);//
        mqttMessage.setPayload(mMessagePub.getText().toString().getBytes());
        try {
            mMqttClient.publish(mTopicPub.getText().toString(),mqttMessage);
        } catch (MqttException e) {
            e.printStackTrace();
        }

    }


    private void subscribe() {
        try {
            mMqttClient.subscribe(mTopicSub.getText().toString(),Integer.parseInt(mQoSub.getText().toString()));
        } catch (MqttException e) {
            e.printStackTrace();
        }

    }



    private void connect() {
        MqttConnectOptions options = new MqttConnectOptions();
        options.setCleanSession(false);

        options.setConnectionTimeout(10);
        // 设置会话心跳时间
        options.setKeepAliveInterval(20);
        try {
            mMqttClient.setCallback(new ConnectCallback());
            mMqttClient.connect(options);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public class ConnectCallback implements MqttCallback {

        public void connectionLost(Throwable cause) {
            // 连接丢失后，一般在这里面进行重连
            Log.w(TAG, "连接断开，可以做重连");
        }

        public void deliveryComplete(IMqttDeliveryToken token) {
            Log.w(TAG, "deliveryComplete---------" + token.isComplete());
        }

        public void messageArrived(String topic, MqttMessage message) throws Exception {
            if(topic.equals(mTopicSub.getText().toString()))
            {
                mMessageSub.setText(topic+": "+new String(message.getPayload()));
            }

        }
    }
}

layout