我正在尝试创建一个Service类，它将Beacon ID发送到服务器，并在手机靠近信标时通过MQTT接收来自服务器的响应，然后触发通知。但是，我希望每个响应主题都应该与通过MQTT将Beacon数据发送到服务器的每个用户不同。该主题与向服务器发送请求相同，但在后面添加用户名。
示例：
请求主题= send_beacon
回复主题= send_beacon/username
我想要的结果是，来自服务器的响应消息应该触发通知出来。但不知何故，通知本身并未出现，因为方法messageArrived()没有收到任何消息。
这是我的代码
public class BackgroundService extends Service implements IMqttActionListener, MqttCallback, MqttTraceHandler {
private void sleep(int ms) {
try {
Thread.sleep(ms);
} catch (Exception ignored) {
}
}
public void initMqttClient() {
try {
MqttConnectOptions conOpt = new MqttConnectOptions();
MqttSettings.getInstance(getApplicationContext()).setConnectedEnabled(true);
if(!getString(R.string.mqtt_user_id).isEmpty())
conOpt.setUserName(getString(R.string.mqtt_user_id));
if(!getString(R.string.mqtt_password).isEmpty())
conOpt.setPassword(getString(R.string.mqtt_password).toCharArray());
conOpt.setCleanSession(true);
conOpt.setConnectionTimeout(MqttConnectOptions.CONNECTION_TIMEOUT_DEFAULT);
conOpt.setKeepAliveInterval(MqttConnectOptions.KEEP_ALIVE_INTERVAL_DEFAULT);
mqttClient = new MqttAndroidClient(getApplicationContext(),
"tcp://"+getString(R.string.mqtt_server_uri)+":"+getString(R.string.mqtt_server_port),
"beacon_"+ UUID.randomUUID().toString());
mqttClient.registerResources(getApplicationContext());
mqttClient.setCallback(this);
mqttClient.setTraceCallback(this);
mqttClient.connect(conOpt, null, this);
} catch (MqttException e) {
Log.e("MQTTERROR", e.getMessage());
e.printStackTrace();
}
}
private void showCustomerPromoNotification(int promo_id, String name) {
Intent notificationIntent = new Intent(getApplicationContext(), PromotionActivity.class);
notificationIntent.putExtra(PromotionActivity.PROMOTION_ID_EXTRA, promo_id);
notificationIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP
| Intent.FLAG_ACTIVITY_SINGLE_TOP);
PendingIntent intent = PendingIntent.getActivity(getApplicationContext(), 0,
notificationIntent, 0);
Notification notification = new Notification.Builder(getApplicationContext())
.setContentTitle("CAUTION !!!")
.setContentText(name)
.setSmallIcon(R.drawable.ic_logo)
.setLargeIcon(BitmapFactory.decodeResource(getResources(), R.drawable.ic_logo_big))
.setContentIntent(intent)
.build();
NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
notificationManager.notify(promo_id, notification);
}
private PowerManager.WakeLock wakeLock;
private SharedPreferences sharedpreferences;
private Beacon beacon;
private List<Beacon> beacons;
private MqttAndroidClient mqttClient;
private String broadcast_data = "";
@Override
public void onCreate() {
super.onCreate();
PowerManager pm = (PowerManager) getSystemService(this.POWER_SERVICE);
wakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "DoNotSleep");
sharedpreferences = getSharedPreferences(getString(R.string.preference_name), Context.MODE_PRIVATE);
initMqttClient(); // Start MQTT Client (connecting & set subscribe)
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
return START_STICKY;
}
@Override
public void onDestroy() {
super.onDestroy();
if (mqttClient != null) {
try {
Log.d("STOP", "Mqtt: disconnect");
mqttClient.disconnect();
mqttClient = null;
} catch (MqttException e) {
Log.e("STOP", "Mqtt:x disconnection error: ", e);
}
}
beacon.disconnect(this);
}
public void onBeaconReagion(List<Beacon> list, BRegion bRegion) {
this.beacons = list;
String broadcast_msg;
for (Beacon beacon : beacons) {
int major = beacon.getMajor();
int minor = beacon.getMinor();
if(Double.compare(beacon.getAccuracy(), 3.0) > 0) continue;
broadcast_msg = String.format(Locale.US, "%d,%s,%d,%d",
sharedpreferences.getInt(getString(R.string.pref_user_id), 0),
sharedpreferences.getString(getString(R.string.pref_token), ""),
major,
minor);
try {
if(sharedpreferences.getInt(getString(R.string.pref_user_group_id), 0) == 4) {
mqttClient.publish(getString(R.string.mqtt_publish_topic_customer), broadcast_msg.getBytes(), 1, false);
}
else {
mqttClient.publish(getString(R.string.mqtt_publish_topic_employee), broadcast_msg.getBytes(), 1, false);
}
} catch (MqttException e) {
e.printStackTrace();
}
}
sleep(1 * 30 * 1000); // Hold every 30 seconds
}
@Override
public void connectionLost(Throwable cause) {
}
@Override
public void messageArrived(String topic, MqttMessage mqttMessage) throws Exception {
Log.d("MQTTMSG", new String(mqttMessage.getPayload()));
String[] message = new String(mqttMessage.getPayload()).split(",");
int user_group_id = sharedpreferences.getInt(getString(R.string.pref_user_group_id), 0);
try {
Date last_notification_time = new Date(sharedpreferences.getLong(getString(R.string.pref_last_notification_time), 0));
if (user_group_id == 4) { //TODO compare hours by 3 hours
showCustomerPromoNotification(Integer.parseInt(message[0]), message[1]);
Date date = new Date();
sharedpreferences.edit().putLong(getString(R.string.pref_last_notification_time), date.getTime()).apply();
mqttMessage.clearPayload();
}
}
catch (NumberFormatException nfe) {
nfe.printStackTrace();
}
}
@Override
public void deliveryComplete(IMqttDeliveryToken token) {
}
@Override
public void traceDebug(String tag, String message) {
}
@Override
public void traceError(String tag, String message) {
}
@Override
public void traceException(String tag, String message, Exception e) {
}
@Override
public void onSuccess(IMqttToken asyncActionToken) {
int user_group_id = sharedpreferences.getInt(getString(R.string.pref_user_group_id), 0);
if(user_group_id == 4)
try {
mqttClient.subscribe(getString(R.string.mqtt_publish_topic_customer)+"/"+getString(R.string.pref_user_name), 1);
Log.d("MQTTSUBS", "Subscribe to = "+getString(R.string.mqtt_publish_topic_customer)+"/"+sharedpreferences.getString(getString(R.string.pref_user_name), ""));
} catch (MqttException e) {
e.printStackTrace();
}
}
@Override
public void onFailure(IMqttToken asyncActionToken, Throwable exception) {
}
}
感谢您的帮助