Android mqtt入门 Android studio
2018年04月09日 14:02:30 hbw020 阅读数：1564
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 MQTTServiceextends Service {private static final StringTAG="MQTTService"; public final StringSERVICE_CLASSNAME ="de.eclipsemagazin.mqtt.push.MQTTService"; private Handlerhandler; // private String host = "tcp://192.168.2.151:1883";// private String userName = "admin";// private String passWord = "password"; private int i =1; private static MqttClientclient; // private String myTopic = "qaiot/user/f5c71e03-c324-4b32-823c-563471e86da9";// private String myTopic = "qaiot/user/f5c71e03-c324-4b32"; private StringmyTopic ="qaiot/server/user/1.0/cn"; StringclientId ="qaiot/user/f5c71e03-c324-4b32"; private MqttConnectOptionsoptions; private static ScheduledExecutorServicescheduler; public JooanMQTTService() { }@Override public IBinderonBind(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*@authorlonggangbai*/public class MQTTPushCallbackimplements MqttCallback {private static final StringTAG="PushCallback"; private ContextWrappercontext; 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。*@paramtoken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);
}
)
详解)
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