分享 mqtt简单使用介绍：
1、as创建工程
2、官网下载mqtt支持包放入lib文件，点击打开链接，https://repo.eclipse.org/content/repositories/paho-releases/org/eclipse/paho/org.eclipse.paho.client.mqttv3/1.2.0/。当前使用的是：
org.eclipse.paho.client.mqttv3-1.2.0.jar
3、然后开始工作：
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.MqttException; import org.eclipse.paho.client.mqttv3.MqttMessage; import org.eclipse.paho.client.mqttv3.persist.MemoryPersistence; import java.util.concurrent.Executors; import java.util.concurrent.ScheduledExecutorService; import java.util.concurrent.TimeUnit; /** * 全局主服务分发和接收mqtt消息 */ public class MQTTService extends Service { private static final String TAG = "MQTTService"; public final String SERVICE_CLASSNAME = "de.eclipsemagazin.mqtt.push.MQTTService"; private Handler handler; // private String host = "tcp://192.168.2.151:1883"; // private String userName = "admin"; // private String passWord = "password"; private int i = 1; private static MqttClient client; // private String myTopic = "qaiot/user/f5c71e03-c324-4b32-823c-563471e86da9"; // private String myTopic = "qaiot/user/f5c71e03-c324-4b32"; private String myTopic = "qaiot/server/user/1.0/cn"; String clientId = "qaiot/user/f5c71e03-c324-4b32"; private MqttConnectOptions options; private static ScheduledExecutorService scheduler; public JooanMQTTService() { } @Override public IBinder onBind(Intent intent) { // TODO: Return the communication channel to the service. throw new UnsupportedOperationException("Not yet implemented"); } @Override public void onCreate() { super.onCreate(); initMqttClient(); handler = new Handler() { @Override public void handleMessage(Message msg) { super.handleMessage(msg); if (msg.what == 1) { Toast.makeText(JooanApplication.get(), (String) msg.obj, Toast.LENGTH_SHORT).show(); NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); Notification notification = new Notification(R.drawable.menu_item_small_bg, "Mqtt即时推送", System.currentTimeMillis()); // notification.contentView = new RemoteViews("com.hxht.testmqttclient", R.layout.activity_notification); notification.contentView = new RemoteViews("com.jooan.qiaoanzhilian", R.layout.service_jooan_mqtt_notification); notification.contentView.setTextViewText(R.id.tv_desc, (String) msg.obj); notification.defaults = Notification.DEFAULT_SOUND; notification.flags = Notification.FLAG_AUTO_CANCEL; manager.notify(i++, notification); Log.e(TAG, "Mqtt收到推送结果: " + (String) msg.obj); } else if (msg.what == 2) { Log.i(TAG, "连接成功"); Toast.makeText(JooanApplication.get(), "连接成功", Toast.LENGTH_SHORT).show(); try { client.subscribe(clientId, 1); } catch (Exception e) { e.printStackTrace(); } } else if (msg.what == 3) { Toast.makeText(JooanApplication.get(), "连接失败，系统正在重连", Toast.LENGTH_SHORT).show(); Log.i(TAG, "连接失败，系统正在重连"); } } }; startReconnect(); } private void initMqttClient() { try { //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(JooanApplication.get().BROKER_URL, myTopic, new MemoryPersistence()); //MQTT的连接设置 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(JooanApplication.get().userName); //设置连接的密码 options.setPassword(JooanApplication.get().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); // options.setWill();//如果项目中需要知道客户端是否掉线可以调用该方法 //设置回调 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.w(TAG, "connectionLost----------: " + cause.getMessage()); } @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.w(TAG, "messageArrived---------- "); Message msg = new Message(); msg.what = 1; msg.obj = topic + "---" + message.toString(); handler.sendMessage(msg); } @Override public void deliveryComplete(IMqttDeliveryToken token) { //publish后会执行到这里 Log.w(TAG, "deliveryComplete---------: " + token.isComplete()); } }); } catch (Exception e) { e.printStackTrace(); } } private void startReconnect() { scheduler = Executors.newSingleThreadScheduledExecutor(); scheduler.scheduleAtFixedRate(new Runnable() { @Override public void run() { if (!client.isConnected()) { connect(); } } }, 0 * 1000, 10 * 1000, TimeUnit.MILLISECONDS); } private void connect() { new Thread(new Runnable() { @Override public void run() { try { client.connect(options); Message msg = new Message(); msg.what = 2; handler.sendMessage(msg); } catch (Exception e) { e.printStackTrace(); Message msg = new Message(); msg.what = 3; handler.sendMessage(msg); } } }).start(); } // 判断服务是否运行中 private boolean serviceIsRunning() { ActivityManager manager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE); for (ActivityManager.RunningServiceInfo service : manager.getRunningServices(Integer.MAX_VALUE)) { if (SERVICE_CLASSNAME.equals(service.service.getClassName())) { return true; } } return false; } public static void stopJooanMQTTService() { if (client != null) { try { client.disconnect(); } catch (Exception e) { e.printStackTrace(); } } if (scheduler != null) { try { scheduler.shutdown(); } catch (Exception e) { e.printStackTrace(); } } } }
import org.eclipse.paho.client.mqttv3.IMqttDeliveryToken; import org.eclipse.paho.client.mqttv3.MqttCallback; import org.eclipse.paho.client.mqttv3.MqttException; import org.eclipse.paho.client.mqttv3.MqttMessage; /** * 发布消息的回调类 * * 必须实现MqttCallback的接口并实现对应的相关接口方法 * ◦CallBack 类将实现 MqttCallBack。每个客户机标识都需要一个回调实例。在此示例中，构造函数传递客户机标识以另存为实例数据。 * 在回调中，将它用来标识已经启动了该回调的哪个实例。 * ◦必须在回调类中实现三个方法： * *http://topmanopensource.iteye.com/blog/1700424 * @author longgangbai */ public class MQTTPushCallback implements MqttCallback { private static final String TAG = "PushCallback"; private ContextWrapper context; public JooanMQTTPushCallback(ContextWrapper context) { this.context = context; } /** * 接收到消息的回调的方法：接收已经预订的发布 */ @Override public void messageArrived(String topic, MqttMessage message) throws Exception { //subscribe（订阅主题）后得到的消息会执行到这里面 // final NotificationManager notificationManager = (NotificationManager) // context.getSystemService(Context.NOTIFICATION_SERVICE); // // final Notification notification = new Notification(R.drawable.snow, // "Black Ice Warning!", System.currentTimeMillis()); // // // Hide the notification after its selected // notification.flags |= Notification.FLAG_AUTO_CANCEL; // // final Intent intent = new Intent(context, BlackIceActivity.class); // final PendingIntent activity = PendingIntent.getActivity(context, 0, intent, 0); // notification.setLatestEventInfo(context, "Black Ice Warning", "Outdoor temperature is " + // new String(message.getPayload()) + "°", activity); // notification.number += 1; // notificationManager.notify(0, notification); Log.w(TAG, "messageArrived: " + "topicName:" + topic + ",messageArrived,订发送消息失败: " + new String(message.getPayload())); } /** * 接收到已经发布的 QoS 1 或 QoS 2 消息的传递令牌时调用。 * @param token 由 MqttClient.connect 激活此回调。 */ @Override public void deliveryComplete(IMqttDeliveryToken token) { //We do not need this because we do not publish//publish（发送消息）后会执行到这里 try { Log.i("PushCallback", "deliveryComplete: " + token.getMessage().toString()); } catch (MqttException e) { e.printStackTrace(); } try { Log.i(TAG,"Delivery token \"" + token.hashCode()); System.out.println("订阅主题: " + token.getMessageId()); System.out.println("消息数据: " + token.getTopics().toString()); System.out.println("消息级别(0,1,2): " + token.getGrantedQos().toString()); System.out.println("是否是实时发送的消息(false=实时，true=服务器上保留的最后消息): " + token.isComplete()); } catch (Exception e) { e.printStackTrace(); } } /** * 当客户机和broker意外断开时触发 * 可以再此处理重新订阅 */ @Override public void connectionLost(Throwable cause) { //We should reconnect here //连接丢失后，一般在这里面进行重连 Log.w(TAG, "connectionLost: " + cause.getMessage()); cause.printStackTrace(); } }
activity调用发送消息（主题和消息主题与服务器定义一致）：
public String BROKER_URL = "tcp://192.168.1.151:1883";//broker host服务器地址
private MqttClient mqttClient;
private String clientId = "qaiot/user/f5c71e03-c324-4b32";
private String TOPIC = "qaiot/server/user/1.0/cn";
@Override
protected void onCreate(Bundle savedInstanceState) {//启动服务
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_jooan_login);
startService(new Intent(this,MQTTService.class));
}
//发送消息代码：
new Thread(new Runnable() {
@Override
public void run() {
LogUtil.i("开始登录");
try {
//创建MqttClient对象
mqttClient = new MqttClient(JooanApplication.get().BROKER_URL, clientId, new MemoryPersistence());
//MqttClient绑定
mqttClient.setCallback(new JooanMQTTPushCallback(JooanLoginActivity.this));
// ---------------------------------------------------------------
// MqttConnectOptions connOpts = new MqttConnectOptions();
// connOpts.setCleanSession(true);
// System.out.println("Connecting to broker: "+BROKER_URL);
// mqttClient.connect(connOpts);
// System.out.println("Connected");
// System.out.println("Publishing message: "+"Message from MqttPublishSample");
// ---------------------------------------------------------------
//MqttClient绑定
mqttClient.connect();
//Subscribe to all subtopics of homeautomation
// mqttClient.subscribe(TOPIC);
//创建MQTT相关的主题
MqttTopic temperatureTopic = mqttClient.getTopic(TOPIC);
Gson gson = new Gson();
String toJson = gson.toJson(getData());
Log.e("MQTTService", "gson对象:" + toJson);
//创建MQTT的消息体
MqttMessage message = new MqttMessage(toJson.getBytes());
//设置消息传输的类型:消息级别(0,1,2)
message.setQos(1);
//设置是否在服务器中保存消息体
message.setRetained(false);
//设置消息的内容
// message.setPayload(WSMQTTServerCommon.publication.getBytes());
//发送消息并获取回执
MqttDeliveryToken token = temperatureTopic.publish(message);//发送消息
// token.waitForCompletion();设置超时
System.out.println("Publishing \"" + message.toString()
+ "\" on topic \"" + temperatureTopic.getName() + "\" with QoS = "
+ message.getQos());
System.out.println("For client instance \"" + mqttClient.getClientId()
+ "\" on address " + mqttClient.getServerURI() + "\"");
System.out.println("With delivery token \"" + token.hashCode()
+ " delivered: " + token.isComplete());
//关闭连接
// if (mqttClient.isConnected())
// mqttClient.disconnect(Integer.parseInt(System.getProperty("timeout", "10000")));
// Log.i(TAG, "发送消息的超时时间: "+Integer.parseInt(System.getProperty("timeout", "10000")));
} catch (MqttException e) {
Toast.makeText(getApplicationContext(), "Something went wrong!" + e.getMessage(), Toast.LENGTH_LONG).show();
e.printStackTrace();
LogUtil.i(e.getMessage());
}
}
}).start();
@Override
protected void onDestroy() {
super.onDestroy();
recycler_view.clearOnScrollListeners();
JooanMQTTService.stopMQTTService();//停止服务
Intent intent = new Intent(this, MQTTService.class);
stopService(intent);
}