我正在使用mqtt android客户端流式传输位置。直到失去互联网连接之前，它都可以正常工作。 mqtt客户端未按预期重新连接。我应该怎么做才能确保paho mqtt重新连接到代理。 我想强制mqtt客户端重新连接到代理，并在连接返回时继续发布位置。
下面是我的代码。
public class MqttClientHelperService2 extends Service {
private MqttAndroidClient mqttAndroidClient;
BroadcastReceiver broadcastReceiver;
private final String SERVER_URL = "tcp://000.102.110.**:1883";
private final String CLIENT_ID = "client_id";
private final String MQTT_TOPIC = "livelocations/local";
LiveLocation liveLocation;
@Override
public void onCreate() {
super.onCreate();
Thread newThread = new Thread(){
public void run(){
init();
}
};
newThread.start();
if (Build.VERSION.SDK_INT >= 26) {
String CHANNEL_ID = "my_channel_01";
NotificationChannel channel = new NotificationChannel(CHANNEL_ID,
"Channel human readable title",
NotificationManager.IMPORTANCE_LOW);
((NotificationManager) Objects.requireNonNull(getSystemService(Context.NOTIFICATION_SERVICE))).
createNotificationChannel(channel);
Notification notification = new NotificationCompat.Builder(this, CHANNEL_ID)
.setContentTitle("")
.setContentText("")
.setSmallIcon(R.mipmap.ic_launcher).build();
startForeground(1, notification);
}
}
private void init() {
mqttAndroidClient = new MqttAndroidClient(getApplicationContext(), SERVER_URL, CLIENT_ID);
mqttAndroidClient.setCallback(new MqttCallback() {
@Override
public void connectionLost(Throwable cause) {
}
@Override
public void messageArrived(String topic, MqttMessage message) throws Exception {
}
@Override
public void deliveryComplete(IMqttDeliveryToken token) {
}
});
}
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
liveLocation= new LiveLocation(
intent.getIntExtra("driver_id", 0),
intent.getDoubleExtra("latitude", 0),
intent.getDoubleExtra("longitude", 0),
"");
connectMqtt();
return START_STICKY;
}
private MqttConnectOptions getMqttOptions(){
MqttConnectOptions mqttConnectOptions = new MqttConnectOptions();
mqttConnectOptions.setMqttVersion(MqttConnectOptions.MQTT_VERSION_3_1_1);
mqttConnectOptions.setAutomaticReconnect(true);
mqttConnectOptions.setCleanSession(false);
return mqttConnectOptions;
}
private void connectMqtt() {
try {
IMqttToken iMqttToken = mqttAndroidClient.connect(getMqttOptions());
iMqttToken.setActionCallback(new IMqttActionListener() {
@Override
public void onSuccess(IMqttToken asyncActionToken) {
Log.e("phanuel-log", "connecting ......." + Calendar.getInstance().getTime());
publishToServer(liveLocation);
}
@Override
public void onFailure(IMqttToken asyncActionToken, Throwable exception) {
Log.e("phanuel-log-error", "connection error");
}
});
} catch (MqttException e) {
e.printStackTrace();
}
}
@Override
public void onDestroy() {
if(mqttAndroidClient != null){
try {
mqttAndroidClient.unregisterResources();
mqttAndroidClient.close();
mqttAndroidClient.disconnect();
} catch (Exception e){
e.printStackTrace();
}
}
unregisterReceiver(broadcastReceiver);
broadcastReceiver = null;
super.onDestroy();
}
private boolean isNetworkAvailable() {
ConnectivityManager connectivityManager
= (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
assert connectivityManager != null;
NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
return activeNetworkInfo != null && activeNetworkInfo.isConnectedOrConnecting();
}
void publishToServer(final LiveLocation location) {
try {
if (location.getDriverId() > 0){
mqttAndroidClient.connect(getMqttOptions(), null, new IMqttActionListener() {
@Override
public void onSuccess(IMqttToken asyncActionToken) {
JSONObject locationJsonObject = new JSONObject();
try {
locationJsonObject.put("driverId", location.getDriverId());
locationJsonObject.put("driverLatitude", location.getLatitude());
locationJsonObject.put("driverLongitude", location.getLongitude());
locationJsonObject.put("driverTimeStamp", Calendar.getInstance().getTime());
} catch (JSONException e) {
e.printStackTrace();
}
MqttMessage mqttMessage = new MqttMessage();
mqttMessage.setPayload(locationJsonObject.toString().getBytes());
mqttMessage.setQos(0);
mqttMessage.setRetained(false);
try {
mqttAndroidClient.publish(MQTT_TOPIC, mqttMessage);
}catch (MqttException e){
e.printStackTrace();
}
}
@Override
public void onFailure(IMqttToken asyncActionToken, Throwable exception) {
Log.e("mqtt-client", "Failed to connect");
Log.e("mqtt-cleint", exception.toString());
}
});
}
} catch (MqttException e){
e.printStackTrace();
}
}
}
答案 0 :(得分：0)
有多种方法可以处理您的情况。