我将服务编码为来自mqtt服务器的订阅消息。打开/关闭互联网连接时服务自动重新连接。
此代码：
public class NotificationService extends Service{
private Handler connectBrokerHandler;
private ConnectBrokerTimerTask connectBrokerTimerTask;
private Timer connectBrokerTimer;
private MqttAndroidClient androidClient;
private MqttConnectOptions connectOptions;
private MemoryPersistence memPer;
private IMqttToken connectToken;
private CustomActionListener customActionListener;
private Context context;
private String CLIENT_STATUS = CLIENT_INIT;
private static final String TAG = "NotificationService";
private static final String USER_NAME = "chuxuanhy";
private static final String PASS_WORD = "0936160721";
private static final String URL_BROKER = "tcp://ntm.diyoracle.com:1883";
private static final String TOPIC_STAFF = "PROSHIP_STAFF";
private static final String DEVICE_ID = "FUCKYOU_002";
private static final int CONNECTION_TIMEOUT = 60;
private static final int KEEP_ALIVE_INTERVAL = 60*60;
private static final int TRY_CONNECTION_DELAY = 30; //seconds
private static final String CLIENT_INIT = "CLIENT_INIT";
private static final String CLIENT_CONNECTION_BROKER_START = "CLIENT_CONNECTION_BROKER_START";
private static final String CLIENT_CONNECTION_BROKER_FAIL = "CLIENT_CONNECTION_BROKER_FAIL";
private static final String CLIENT_CONNECTION_BROKER_SUCCESS = "CLIENT_CONNECTION_BROKER_SUCCESS";
private static final String CLIENT_LOST_CONNECTION = "CLIENT_LOST_CONNECTION";
private static final String CLIENT_SUBSCRIBE_TOPIC_START = "CLIENT_SUBSCRIBE_TOPIC_START";
private static final String CLIENT_SUBSCRIBE_TOPIC_FAIL = "CLIENT_SUBSCRIBE_TOPIC_FAIL";
private static final String CLIENT_SUBSCRIBE_TOPIC_SUCCESS = "CLIENT_SUBSCRIBE_TOPIC_SUCCESS";
private IntentFilter FilterNetwork;
private BroadcastReceiver ReceiverCheckInternet = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
if(isOnline()){
if(CLIENT_STATUS == CLIENT_LOST_CONNECTION || CLIENT_STATUS == CLIENT_CONNECTION_BROKER_FAIL || CLIENT_STATUS == CLIENT_SUBSCRIBE_TOPIC_FAIL) {
ConnectBroker();
}
}
}
};
private class ConnectBrokerTimerTask extends TimerTask{
@Override
public void run() {
connectBrokerHandler.post(ConnectBrokerRunable);
}
}
private Runnable ConnectBrokerRunable = new Runnable() {
@Override
public void run() {
ConnectBroker();
}
};
public boolean isOnline() {
ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netInfo = cm.getActiveNetworkInfo();
return netInfo != null && netInfo.isConnectedOrConnecting();
}
public void RestartNotificationService(){
Intent restartServiceIntent = new Intent(getApplicationContext(), this.getClass());
restartServiceIntent.setPackage(getPackageName());
PendingIntent restartServicePendingIntent = PendingIntent.getService(getApplicationContext(), 1, restartServiceIntent, PendingIntent.FLAG_ONE_SHOT);
AlarmManager alarmService = (AlarmManager) getApplicationContext().getSystemService(Context.ALARM_SERVICE);
alarmService.set(AlarmManager.ELAPSED_REALTIME, SystemClock.elapsedRealtime() + 1000, restartServicePendingIntent);
}
public void createNotification(String title, String body) {
Intent intent = new Intent(this, NotificationReceiver.class);
PendingIntent pIntent = PendingIntent.getActivity(this, (int) System.currentTimeMillis(), intent, 0);
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(getApplicationContext());
Notification notification = mBuilder.setSmallIcon(R.drawable.train).setTicker(title).setWhen(0)
.setAutoCancel(true)
.setContentTitle(title)
.setStyle(new NotificationCompat.BigTextStyle().bigText(body))
.setContentIntent(pIntent)
.setSound(RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION))
.setVibrate(new long[]{1000, 1000})
.setLargeIcon(BitmapFactory.decodeResource(getApplicationContext().getResources(), R.mipmap.ic_launcher))
.setContentText(body).build();
Random random = new Random();
int m = random.nextInt(9999 - 1000) + 1000;
NotificationManager notificationManager = (NotificationManager) getApplicationContext().getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(m, notification);
}
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onTaskRemoved(Intent rootIntent) {
try{
RestartNotificationService();
}catch (Exception e){
e.printStackTrace();
}
super.onTaskRemoved(rootIntent);
}
@Override
public void onDestroy() {
super.onDestroy();
unregisterReceiver(ReceiverCheckInternet);
Log.e(TAG, "onDestroy");
try{
if(androidClient.isConnected()){
this.androidClient.unsubscribe(TOPIC_STAFF);
this.androidClient.disconnect();
this.androidClient = null;
}
}catch (Exception e){
e.printStackTrace();
}
}
private void ConnectBroker(){
try {
CLIENT_STATUS = CLIENT_CONNECTION_BROKER_START;
connectToken = this.androidClient.connect(connectOptions,null,customActionListener);
}catch (Exception e){
//e.printStackTrace();
Log.e(TAG, "ConnectBroker Fail Exception");
}
}
private void SubscribeBrokerTopic(String topic){
try {
CLIENT_STATUS = CLIENT_SUBSCRIBE_TOPIC_START;
androidClient.subscribe(topic, 0, null, customActionListener);
} catch (Exception e) {
//e.printStackTrace();
Log.e(TAG, "SubscribeBrokerTopic Fail Exception");
}
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.e("NOTIFI","CALL ME onStartCommand");
this.connectBrokerHandler = new Handler();
this.connectBrokerTimer = new Timer();
this.connectBrokerTimerTask = new ConnectBrokerTimerTask();
this.customActionListener = new CustomActionListener();
this.memPer = new MemoryPersistence();
this.connectOptions = new MqttConnectOptions();
this.connectOptions.setCleanSession(true);
this.connectOptions.setUserName(USER_NAME);
this.connectOptions.setPassword(PASS_WORD.toCharArray());
this.connectOptions.setConnectionTimeout(CONNECTION_TIMEOUT);
this.connectOptions.setKeepAliveInterval(KEEP_ALIVE_INTERVAL);
this.androidClient = new MqttAndroidClient(getApplicationContext(),URL_BROKER,DEVICE_ID,memPer);
this.androidClient.setCallback(new CustomCallBack());
this.androidClient.setTraceCallback(new CustomTraceHandler());
//this.androidClient.
this.FilterNetwork = new IntentFilter();
this.FilterNetwork.addAction("android.net.conn.CONNECTIVITY_CHANGE");
registerReceiver(ReceiverCheckInternet, FilterNetwork);
//this.androidClient.registerResources(getApplicationContext());
ConnectBroker();
return START_NOT_STICKY;
}
private class CustomTraceHandler implements MqttTraceHandler{
@Override
public void traceDebug(String source, String message) {
Log.e(TAG,"CustomConnectHandler - traceDebug\n"+source+" - "+message);
}
@Override
public void traceError(String source, String message) {
Log.e(TAG, "CustomConnectHandler - traceError\n" + source + " - " + message);
}
@Override
public void traceException(String source, String message, Exception e) {
Log.e(TAG, "CustomConnectHandler - traceException\n" + source + " - " + message);
e.printStackTrace();
}
}
private class CustomCallBack implements MqttCallback{
@Override
public void connectionLost(Throwable throwable) {
CLIENT_STATUS = CLIENT_LOST_CONNECTION;
if(!isOnline()){
Log.e(TAG, "ConnectCallBack connectionLost - No Internet Connection ");
}else {
//throwable.printStackTrace();
}
}
@Override
public void messageArrived(String s, MqttMessage mqttMessage) throws Exception {
Log.e(TAG,"ConnectCallBack messageArrived\n"+s+" - "+mqttMessage.toString());
createNotification(s, mqttMessage.toString());
}
@Override
public void deliveryComplete(IMqttDeliveryToken iMqttDeliveryToken) {
Log.e(TAG, "ConnectCallBack deliveryComplete");
}
}
private class CustomActionListener implements IMqttActionListener {
@Override
public void onSuccess(IMqttToken iMqttToken) {
if (CLIENT_STATUS == CLIENT_CONNECTION_BROKER_START) {
CLIENT_STATUS = CLIENT_CONNECTION_BROKER_SUCCESS;
if (iMqttToken.getTopics() == null) {
SubscribeBrokerTopic(TOPIC_STAFF);
}
Log.e(TAG, "CustomActionListener - CONNECT BROKER onSuccess");
} else if (CLIENT_STATUS == CLIENT_SUBSCRIBE_TOPIC_START) {
CLIENT_STATUS = CLIENT_SUBSCRIBE_TOPIC_SUCCESS;
Log.e(TAG, "CustomActionListener - SUBSCRIBE TOPIC onSuccess");
}
}
@Override
public void onFailure(IMqttToken iMqttToken, Throwable throwable) {
if (CLIENT_STATUS == CLIENT_CONNECTION_BROKER_START) {
CLIENT_STATUS = CLIENT_CONNECTION_BROKER_FAIL;
Log.e(TAG, "CustomActionListener - CONNECT BROKER onFailure ");
} else if (CLIENT_STATUS == CLIENT_SUBSCRIBE_TOPIC_START) {
CLIENT_STATUS = CLIENT_SUBSCRIBE_TOPIC_FAIL;
Log.e(TAG, "CustomActionListener - SUBSCRIBE TOPIC onFailure ");
}
if (isOnline()) {
throwable.printStackTrace();
//connectBrokerTimer.scheduleAtFixedRate(connectBrokerTimerTask, 5000, TRY_CONNECTION_DELAY * 1000);
}else {
Log.e(TAG, "CustomActionListener onFailure - No Internet Connection ");
}
}
}
}
但我有一个问题，每次互联网连接丢失，我重新连接服务器，再次回拨电话。 例如：
Log.e(TAG, "ConnectCallBack connectionLost - No Internet Connection ");
每次断开互联网两次，3次，4次通话 对不起，我的英语不好，谢谢你的帮助。
答案 0 :(得分：0)
不要手动处理重新连接，较新版本的paho可以选择在MqttConnectOptions类中自动重新连接。
compile 'org.eclipse.paho:org.eclipse.paho.client.mqttv3:1.1.1'
compile 'org.eclipse.paho:org.eclipse.paho.android.service:1.1.1'