1、项目创建
2、在mainfests添加权限
3、在APP的级别下添加依赖包
implementation 'org.eclipse.paho:org.eclipse.paho.client.mqttv3:1.1.0'
implementation 'org.eclipse.paho:org.eclipse.paho.android.service:1.1.1'
4、我这里使用的是服务状态下接收MQTT，然后创建MQTTService
继承Service并实现Service的实现类
4、实现MTQQ的方法，我这里都放到了一个service里（不想手敲就直接复制使用就得了）
public class MQTTService extends Service {
@SuppressLint("StaticFieldLeak")
public static MqttAndroidClient mqttAndroidClient;
public static MqttConnectOptions mMqttConnectOptions;
//我的服务器搭建在自己电脑，只能在局域网实现
public static String HOST = "tcp://192.168.73.128:1883";
//用户名
public static String USERNAME = "root";
//密码
public static String PASSWORD = "123123";
public static final String TAG = MQTTService.class.getSimpleName();
//PUBLISH_TOPIC为Android端发布的主题，用于让硬件端接受的主题，硬件订阅这主题后可以接收Android端向下发送的命令和数据
public static String PUBLISH_TOPIC = "/sys/Android/0001/thing/sservice/property/xifa";
public static String ONCLICK_PUBLISH_TOPIC = "/sys/a1l5AvjQHJc/0001/thing/event/property/post";
//响应主题，接收硬件端的数据后给硬件返回一个响应主题，用来确保Android端已接收成功
public static String RESPONSE_TOPIC = "message_arrived";
//客户端ID，一般以客户端唯一标识符表示，这里用设备序列号表示,建议使用自己写的
public String CLIENTID = "dasdad";
@RequiresApi(api = Build.VERSION_CODES.O)
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
init_sensor();
return super.onStartCommand(intent, flags, startId);
}
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
public static void startService(Context mContext) {
mContext.startService(new Intent(mContext, MQTTService.class));
}
public static void publish(String message) {
Integer qos = 2;
Boolean retained = false;
try {
mqttAndroidClient.publish(PUBLISH_TOPIC, message.getBytes(), qos.intValue(), retained.booleanValue());
} catch (MqttException e) {
e.printStackTrace();
}
}
@RequiresApi(api = Build.VERSION_CODES.O)
private void init_sensor() {
String serverURI = HOST; //服务器地址（协议+地址+端口号）
mqttAndroidClient = new MqttAndroidClient(this, serverURI, CLIENTID);
mqttAndroidClient.setCallback(mqttCallback1); //设置监听订阅消息的回调
mMqttConnectOptions = new MqttConnectOptions();
mMqttConnectOptions.setCleanSession(true); //设置是否清除缓存
mMqttConnectOptions.setConnectionTimeout(10); //设置超时时间，单位：秒
mMqttConnectOptions.setKeepAliveInterval(20); //设置心跳包发送间隔，单位：秒
mMqttConnectOptions.setUserName(USERNAME); //设置用户名
mMqttConnectOptions.setPassword(PASSWORD.toCharArray()); //设置密码
// last will message
boolean doConnect = true;
String message = "{"terminal_uid":"" + CLIENTID + ""}";
String topic = PUBLISH_TOPIC;
Integer qos = 2;
Boolean retained = false;
if ((!message.equals("")) || (!topic.equals(""))) {
// 最后的遗嘱
try {
mMqttConnectOptions.setWill(topic, message.getBytes(), qos.intValue(), retained.booleanValue());
} catch (Exception e) {
Log.i(TAG, "Exception Occured", e);
doConnect = false;
iMqttActionListener.onFailure(null, e);
}
}
if (doConnect) {
doClientConnection();
}
}
private void doClientConnection() {
if (!mqttAndroidClient.isConnected() && isConnectIsNormal()) {
try {
mqttAndroidClient.connect(mMqttConnectOptions, null, iMqttActionListener);
} catch (MqttException e) {
e.printStackTrace();
}
}
}
private boolean isConnectIsNormal() {
ConnectivityManager connectivityManager = (ConnectivityManager) this.getApplicationContext().getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo info = connectivityManager.getActiveNetworkInfo();
if (info != null && info.isAvailable()) {
String name = info.getTypeName();
Log.e(TAG, "当前网络名称：" + name);
return true;
} else {
Log.i(TAG, "没有可用网络");
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
doClientConnection();
}
}, 3000);
return false;
}
}
//MQTT是否连接成功的监听
private IMqttActionListener iMqttActionListener = new IMqttActionListener() {
@Override
public void onSuccess(IMqttToken arg0) {
Log.i(TAG, "连接成功 ");
try {
mqttAndroidClient.subscribe(ONCLICK_PUBLISH_TOPIC, 2);//订阅主题，参数：主题、服务质量
} catch (MqttException e) {
e.printStackTrace();
}
}
@Override
public void onFailure(IMqttToken arg0, Throwable arg1) {
arg1.printStackTrace();
Log.i(TAG, "连接失败 ");
doClientConnection();//连接失败，重连（可关闭服务器进行模拟）
}
};
//订阅主题的回调
private MqttCallback mqttCallback1 = new MqttCallback() {
@Override
public void messageArrived(String topic, MqttMessage message) throws Exception {
String s = new String(message.getPayload());
Log.e("access",""+s);
}
@Override
public void deliveryComplete(IMqttDeliveryToken arg0) {}
@Override
public void connectionLost(Throwable arg0) {
Log.i(TAG, "连接断开 ");
doClientConnection();//连接断开，重连
}
};
public static void response(String message) {
String topic = RESPONSE_TOPIC;
Integer qos = 0;
Boolean retained = false;
try {
//参数分别为：主题、消息的字节数组、服务质量、是否在服务器保留断开连接后的最后一条消息
mqttAndroidClient.publish(topic, message.getBytes(), qos.intValue(), retained.booleanValue());
} catch (MqttException e) {
e.printStackTrace();
}
}
@Override
public void onDestroy() {
try {
mqttAndroidClient.disconnect(); //断开连接
} catch (MqttException e) {
e.printStackTrace();
}
super.onDestroy();
}
}
5、记得在mainfest里添加下面的服务，这包的MqttService，不是自己创建的，添加自己创建的MQTTServie服务
