安卓下调用MQtt实现消息推送

【实例截图】

【核心代码】

package cn.tyys.mqttbroker.client;

import android.os.Handler;
import android.os.Message;
import android.util.Log;

import org.eclipse.paho.client.mqttv3.IMqttDeliveryToken;
import org.eclipse.paho.client.mqttv3.MqttCallback;
import org.eclipse.paho.client.mqttv3.MqttClient;
import org.eclipse.paho.client.mqttv3.MqttConnectOptions;
import org.eclipse.paho.client.mqttv3.MqttDeliveryToken;
import org.eclipse.paho.client.mqttv3.MqttException;
import org.eclipse.paho.client.mqttv3.MqttMessage;
import org.eclipse.paho.client.mqttv3.MqttTopic;
import org.eclipse.paho.client.mqttv3.persist.MemoryPersistence;

/**
 * Created by lhq on 2018/5/21.
 */

public class ApolloClient {

    private static String host;
    private static String userName = "admin";
    private static String passWord = "password";
    private static MqttClient client;
    private Handler handler;
    private static String send_topic ;
    private static String receive_topic ;


    public ApolloClient(Handler handler,String host,String send_topic,String receive_topic) {
        this.handler=handler;
        this.host=host;
        this.send_topic=send_topic;
        this.receive_topic=receive_topic;
    }

    public void createContent() throws MqttException {
        //host为主机名，test为clientid即连接MQTT的客户端ID，一般以客户端唯一标识符表示，
        //MemoryPersistence设置clientid的保存形式，默认为以内存保存
        client = new MqttClient(host, "client", new MemoryPersistence());
        MqttConnectOptions options = new MqttConnectOptions();
        //设置是否清空session,这里如果设置为false表示服务器会保留客户端的连接记录，
        //这里设置为true表示每次连接到服务器都以新的身份连接
        options.setCleanSession(true);
        //设置连接的用户名
        options.setUserName(userName);
        //设置连接的密码
        options.setPassword(passWord.toCharArray());
        // 设置超时时间 单位为秒
        options.setConnectionTimeout(10);
        // 设置会话心跳时间 单位为秒 服务器会每隔1.5*20秒的时间向客户端发送个消息判断客户端是否在线，但这个方法并没有重连的机制
        options.setKeepAliveInterval(20);
        //回调
        client.setCallback(new MqttCallback() {
            @Override
            public void connectionLost(Throwable cause) {
                // //连接丢失后，一般在这里面进行重连
                Log.d("lhq","connectionLost----------");

                Message obtainMessage = handler.obtainMessage();
                obtainMessage.what=0;
                obtainMessage.obj=cause.getMessage();
                handler.sendMessage(obtainMessage);
            }

            @Override
            public void messageArrived(String topic, MqttMessage message) throws Exception {
                //subscribe后得到的消息会执行到这里面
                Log.d("lhq","messageArrived----------");
                Log.d("lhq",topic "---" message.toString());

                Message obtainMessage = handler.obtainMessage();
                obtainMessage.what=1;
                obtainMessage.obj=message.toString();
                handler.sendMessage(obtainMessage);
            }

            @Override
            public void deliveryComplete(IMqttDeliveryToken token) {
                //publish后会执行到这里
                Log.d("lhq","deliveryComplete---------"  token.isComplete());

            }
        });
        //链接
        client.connect(options);
        //订阅
        client.subscribe(receive_topic, 1);
    }



    public void publish(String meg) throws MqttException {
        MqttTopic topic = client.getTopic(send_topic);
        MqttMessage message = new MqttMessage();
        message.setQos(1);
        message.setRetained(true);
        Log.d("lhq",message.isRetained() "------ratained状态");
        message.setPayload(meg.getBytes());
        MqttDeliveryToken token = topic.publish(message);
        token.waitForCompletion();
    }
}