Android实现推送PushService通知Notification

写在最前：Android实现推送是比较困难的，我这里虽然实现了推送，但是当服务器需要发送的对象一多，就会发生延迟或干脆Down机。很多软件看似实现了推送，其实不然，它们只不过是有一个Service一直在监听网络状态，当手机联网了就主动向服务器请求了数据，给人的感觉像“推送”了一样。这是障眼法，老板们哪管这些，还以为真的推送，非得实现它。殊不知，真正的推送跟服务器的数量有关！再细想一下，如果这么容易就能实现推送，那早就垃圾信息满天飞了，还要发垃圾短信干什么！至少，发垃圾短信还要收费，可是推送就不需要花钱。当别人都是傻子，用免费的不用还用收费的？所以，一味的追求“推送”不可取！
看了以上这些话，你是不是觉得不想再看下去了？这很正常！权当参考罢了.

请先参考： Android推送通知指南

这里使用了IBM提供的MQTT协议实现了推送。有一个wmqtt.jar包需要导入到工程，见附件。

然后编写PushService类实现一个服务，其中有个内部类：
MQTTConnection 实现了 MqttSimpleCallback接口，重写其中的publishArrived方法，我这里是当接受到推送的数据后显示一个Notification，点击该Notification后跳转到一个Activity上。
具体看PushService类，关键的地方我都用中文字说明了：

package com.ata.push;

import org.json.JSONException;
import org.json.JSONObject;

import android.R;
import android.app.AlarmManager;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.SharedPreferences;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.IBinder;
import android.util.Log;

import com.ata.view.NewMesageInfoActivity;
import com.ibm.mqtt.IMqttClient;
import com.ibm.mqtt.MqttClient;
import com.ibm.mqtt.MqttException;
import com.ibm.mqtt.MqttPersistence;
import com.ibm.mqtt.MqttPersistenceException;
import com.ibm.mqtt.MqttSimpleCallback;

/* 
 * PushService that does all of the work.
 * Most of the logic is borrowed from KeepAliveService.
 * http://code.google.com/p/android-random/source/browse/trunk/TestKeepAlive/src/org/devtcg/demo/keepalive/KeepAliveService.java?r=219
 */
public class PushService extends Service
{
	// this is the log tag
	public static final String		TAG = "PushService";

	// the IP address, where your MQTT broker is running.
	private static final String		MQTT_HOST = "172.16.26.41";//需要改成服务器IP
	// the port at which the broker is running. 
	private static int				MQTT_BROKER_PORT_NUM      = 1883;//需要改成服务器port
	// Let's not use the MQTT persistence.
	private static MqttPersistence	MQTT_PERSISTENCE          = null;
	// We don't need to remember any state between the connections, so we use a clean start. 
	private static boolean			MQTT_CLEAN_START          = true;
	// Let's set the internal keep alive for MQTT to 15 mins. I haven't tested this value much. It could probably be increased.
	private static short			MQTT_KEEP_ALIVE           = 60 * 15;
	// Set quality of services to 0 (at most once delivery), since we don't want push notifications 
	// arrive more than once. However, this means that some messages might get lost (delivery is not guaranteed)
	private static int[]			MQTT_QUALITIES_OF_SERVICE = { 0 } ;
	private static int				MQTT_QUALITY_OF_SERVICE   = 0;
	// The broker should not retain any messages.
	private static boolean			MQTT_RETAINED_PUBLISH     = false;
		
	// MQTT client ID, which is given the broker. In this example, I also use this for the topic header. 
	// You can use this to run push notifications for multiple apps with one MQTT broker. 
	public static String			MQTT_CLIENT_ID = "ata";//需要改成自己需要的名称

	// These are the actions for the service (name are descriptive enough)
	private static final String		ACTION_START = MQTT_CLIENT_ID + ".START";
	private static final String		ACTION_STOP = MQTT_CLIENT_ID + ".STOP";
	private static final String		ACTION_KEEPALIVE = MQTT_CLIENT_ID + ".KEEP_ALIVE";
	private static final String		ACTION_RECONNECT = MQTT_CLIENT_ID + ".RECONNECT";
	
	// Connection log for the push service. Good for debugging.
	//private ConnectionLog 			mLog;
	
	// Connectivity manager to determining, when the phone loses connection
	private ConnectivityManager		mConnMan;
	// Notification manager to displaying arrived push notifications 
	private NotificationManager		mNotifMan;

	// Whether or not the service has been started.	
	private boolean 				mStarted;

	// This the application level keep-alive interval, that is used by the AlarmManager
	// to keep the connection active, even when the device goes to sleep.
	private static final long		KEEP_ALIVE_INTERVAL = 1000 * 60 * 28;

	// Retry intervals, when the connection is lost.
	private static final long		INITIAL_RETRY_INTERVAL = 1000 * 10;
	private static final long		MAXIMUM_RETRY_INTERVAL = 1000 * 60 * 30;

	// Preferences instance 
	private SharedPreferences 		mPrefs;
	// We store in the preferences, whether or not the service has been started
	//判断Service是否已经启动，不要重复启动！
	public static final String		PREF_STARTED = "isStarted";
	// We also store the deviceID (target)
	//需要提供手机设备号，该设备号应该事先保存在SharedPreferences中
	public static final String		PREF_DEVICE_ID = "deviceID";
	// We store the last retry interval
	public static final String		PREF_RETRY = "retryInterval";

	// Notification title
	public static String			NOTIF_TITLE = "ata"; //需要改成自己需要的title  	
	// Notification id
	private static final int		NOTIF_CONNECTED = 0;	
		
	// This is the instance of an MQTT connection.
	private MQTTConnection			mConnection;
	private long					mStartTime;
	

	// Static method to start the service
	//在需要的地方直接调用该方法就启动监听了
	public static void actionStart(Context ctx) {
		Intent i = new Intent(ctx, PushService.class);
		i.setAction(ACTION_START);
		ctx.startService(i);
	}

	// Static method to stop the service
	public static void actionStop(Context ctx) {
		Intent i = new Intent(ctx, PushService.class);
		i.setAction(ACTION_STOP);
		ctx.startService(i);
	}
	
	// Static method to send a keep alive message
	public static void actionPing(Context ctx) {
		Intent i = new Intent(ctx, PushService.class);
		i.setAction(ACTION_KEEPALIVE);
		ctx.startService(i);
	}

	@Override
	public void onCreate() {
		super.onCreate();
		
		log("Creating service");
		mStartTime = System.currentTimeMillis();

		/*try {
			//mLog = new ConnectionLog();
			//Log.i(TAG, "Opened log at " + mLog.getPath());
		} catch (IOException e) {
			Log.e(TAG, "Failed to open log", e);
		}*/

		// Get instances of preferences, connectivity manager and notification manager
		mPrefs = getSharedPreferences(TAG, MODE_PRIVATE);
		mConnMan = (ConnectivityManager)getSystemService(CONNECTIVITY_SERVICE);
		mNotifMan = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
	
		/* If our process was reaped by the system for any reason we need
		 * to restore our state with merely a call to onCreate.  We record
		 * the last "started" value and restore it here if necessary. */
		handleCrashedService();
	}
	
	// This method does any necessary clean-up need in case the server has been destroyed by the system
	// and then restarted
	private void handleCrashedService() {
		if (wasStarted() == true) {
			log("Handling crashed service...");
			 // stop the keep alives
			stopKeepAlives(); 
				
			// Do a clean start
			start();
		}
	}
	
	@Override
	public void onDestroy() {
		log("Service destroyed (started=" + mStarted + ")");

		// Stop the services, if it has been started
		if (mStarted == true) {
			stop();
		}
		
	/*	try {
			if (mLog != null)
				mLog.close();
		} catch (IOException e) {}		*/
	}
	
	@Override
	public void onStart(Intent intent, int startId) {
		super.onStart(intent, startId);
		log("Service started with intent=" + intent);

		// Do an appropriate action based on the intent.
		if (intent.getAction().equals(ACTION_STOP) == true) {
			stop();
			stopSelf();
		} else if (intent.getAction().equals(ACTION_START) == true) {
			start();
		} else if (intent.getAction().equals(ACTION_KEEPALIVE) == true) {
			keepAlive();
		} else if (intent.getAction().equals(ACTION_RECONNECT) == true) {
			if (isNetworkAvailable()) {
				reconnectIfNecessary();
			}
		}
	}
	
	@Override
	public IBinder onBind(Intent intent) {
		return null;
	}

	// log helper function
	private void log(String message) {
		log(message, null);
	}
	private void log(String message, Throwable e) {
		if (e != null) {
			Log.e(TAG, message, e);
			
		} else {
			Log.i(TAG, message);			
		}
		
		/*if (mLog != null)
		{
			try {
				mLog.println(message);
			} catch (IOException ex) {}
		}		*/
	}
	
	// Reads whether or not the service has been started from the preferences
	private boolean wasStarted() {
		return mPrefs.getBoolean(PREF_STARTED, false);
	}

	// Sets whether or not the services has been started in the preferences.
	private void setStarted(boolean started) {
		mPrefs.edit().putBoolean(PREF_STARTED, started).commit();		
		mStarted = started;
	}

	private synchronized void start() {
		log("Starting service...");
		
		// Do nothing, if the service is already running.
		if (mStarted == true) {
			Log.w(TAG, "Attempt to start connection that is already active");
			return;
		}
		
		// Establish an MQTT connection
		connect();
		
		// Register a connectivity listener
		registerReceiver(mConnectivityChanged, new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));		
	}

	private synchronized void stop() {
		// Do nothing, if the service is not running.
		if (mStarted == false) {
			Log.w(TAG, "Attempt to stop connection not active.");
			return;
		}

		// Save stopped state in the preferences
		setStarted(false);

		// Remove the connectivity receiver
		unregisterReceiver(mConnectivityChanged);
		// Any existing reconnect timers should be removed, since we explicitly stopping the service.
		cancelReconnect();

		// Destroy the MQTT connection if there is one
		if (mConnection != null) {
			mConnection.disconnect();
			mConnection = null;
		}
	}
	
	// 
	private synchronized void connect() {		
		log("Connecting...");
		// fetch the device ID from the preferences.
		String deviceID = mPrefs.getString(PREF_DEVICE_ID, null);
		// Create a new connection only if the device id is not NULL
		if (deviceID == null) {
			log("Device ID not found.");
		} else {
			try {
				mConnection = new MQTTConnection(MQTT_HOST, deviceID);
			} catch (MqttException e) {
				// Schedule a reconnect, if we failed to connect
				log("MqttException: " + (e.getMessage() != null ? e.getMessage() : "NULL"));
	        	if (isNetworkAvailable()) {
	        		scheduleReconnect(mStartTime);
	        	}
			}
			setStarted(true);
		}
	}

	private synchronized void keepAlive() {
		try {
			// Send a keep alive, if there is a connection.
			if (mStarted == true && mConnection != null) {
				mConnection.sendKeepAlive();
			}
		} catch (MqttException e) {
			log("MqttException: " + (e.getMessage() != null? e.getMessage(): "NULL"), e);
			
			mConnection.disconnect();
			mConnection = null;
			cancelReconnect();
		}
	}

	// Schedule application level keep-alives using the AlarmManager
	private void startKeepAlives() {
		Intent i = new Intent();
		i.setClass(this, PushService.class);
		i.setAction(ACTION_KEEPALIVE);
		PendingIntent pi = PendingIntent.getService(this, 0, i, 0);
		AlarmManager alarmMgr = (AlarmManager)getSystemService(ALARM_SERVICE);
		alarmMgr.setRepeating(AlarmManager.RTC_WAKEUP,
		  System.currentTimeMillis() + KEEP_ALIVE_INTERVAL,
		  KEEP_ALIVE_INTERVAL, pi);
	}

	// Remove all scheduled keep alives
	private void stopKeepAlives() {
		Intent i = new Intent();
		i.setClass(this, PushService.class);
		i.setAction(ACTION_KEEPALIVE);
		PendingIntent pi = PendingIntent.getService(this, 0, i, 0);
		AlarmManager alarmMgr = (AlarmManager)getSystemService(ALARM_SERVICE);
		alarmMgr.cancel(pi);
	}

	// We schedule a reconnect based on the starttime of the service
	public void scheduleReconnect(long startTime) {
		// the last keep-alive interval
		long interval = mPrefs.getLong(PREF_RETRY, INITIAL_RETRY_INTERVAL);

		// Calculate the elapsed time since the start
		long now = System.currentTimeMillis();
		long elapsed = now - startTime;


		// Set an appropriate interval based on the elapsed time since start 
		if (elapsed < interval) {
			interval = Math.min(interval * 4, MAXIMUM_RETRY_INTERVAL);
		} else {
			interval = INITIAL_RETRY_INTERVAL;
		}
		
		log("Rescheduling connection in " + interval + "ms.");

		// Save the new internval
		mPrefs.edit().putLong(PREF_RETRY, interval).commit();

		// Schedule a reconnect using the alarm manager.
		Intent i = new Intent();
		i.setClass(this, PushService.class);
		i.setAction(ACTION_RECONNECT);
		PendingIntent pi = PendingIntent.getService(this, 0, i, 0);
		AlarmManager alarmMgr = (AlarmManager)getSystemService(ALARM_SERVICE);
		alarmMgr.set(AlarmManager.RTC_WAKEUP, now + interval, pi);
	}
	
	// Remove the scheduled reconnect
	public void cancelReconnect() {
		Intent i = new Intent();
		i.setClass(this, PushService.class);
		i.setAction(ACTION_RECONNECT);
		PendingIntent pi = PendingIntent.getService(this, 0, i, 0);
		AlarmManager alarmMgr = (AlarmManager)getSystemService(ALARM_SERVICE);
		alarmMgr.cancel(pi);
	}
	
	private synchronized void reconnectIfNecessary() {		
		if (mStarted == true && mConnection == null) {
			log("Reconnecting...");
			connect();
		}
	}

	// This receiver listeners for network changes and updates the MQTT connection
	// accordingly
	private BroadcastReceiver mConnectivityChanged = new BroadcastReceiver() {
		@Override
		public void onReceive(Context context, Intent intent) {
			// Get network info
			NetworkInfo info = (NetworkInfo)intent.getParcelableExtra (ConnectivityManager.EXTRA_NETWORK_INFO);
			
			// Is there connectivity?
			boolean hasConnectivity = (info != null && info.isConnected()) ? true : false;

			log("Connectivity changed: connected=" + hasConnectivity);

			if (hasConnectivity) {
				reconnectIfNecessary();
			} else if (mConnection != null) {
				// if there no connectivity, make sure MQTT connection is destroyed
				mConnection.disconnect();
				cancelReconnect();
				mConnection = null;
			}
		}
	};
	
	// Display the topbar notification
	private void showNotification(String content) {
		Notification n = new Notification();
				
		n.flags |= Notification.FLAG_SHOW_LIGHTS;
      	n.flags |= Notification.FLAG_AUTO_CANCEL;

        n.defaults = Notification.DEFAULT_ALL;
      	
		n.icon = R.drawable.ic_dialog_info;
		n.when = System.currentTimeMillis();

		Log.i("PushService", "json==="+content);
		String alert=null;
		String id=null;
		try {
			JSONObject json = new JSONObject(content);
			alert = json.optString("alert");
			id = json.optString("id");
		} catch (JSONException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		Intent intent = new Intent(this,NewMesageInfoActivity.class);		
		intent.putExtra("url", "http://testing.portal.ataudc.com/message/"+id);
		intent.putExtra("id", id);
		PendingIntent pi = PendingIntent.getActivity(this, 0,intent, PendingIntent.FLAG_ONE_SHOT);
		// Change the name of the notification here
		n.setLatestEventInfo(this, NOTIF_TITLE, alert, pi);

		mNotifMan.notify(NOTIF_CONNECTED, n);
	}
	
	// Check if we are online
	private boolean isNetworkAvailable() {
		NetworkInfo info = mConnMan.getActiveNetworkInfo();
		if (info == null) {
			return false;
		}
		return info.isConnected();
	}
	
	// This inner class is a wrapper on top of MQTT client.
	private class MQTTConnection implements MqttSimpleCallback {
		IMqttClient mqttClient = null;
		
		// Creates a new connection given the broker address and initial topic
		public MQTTConnection(String brokerHostName, String initTopic) throws MqttException {
			// Create connection spec
	    	String mqttConnSpec = "tcp://" + brokerHostName + "@" + MQTT_BROKER_PORT_NUM;
	        	// Create the client and connect
	        	mqttClient = MqttClient.createMqttClient(mqttConnSpec, MQTT_PERSISTENCE);
	        	String clientID = MQTT_CLIENT_ID + "/" + mPrefs.getString(PREF_DEVICE_ID, "");
	        	mqttClient.connect(clientID, MQTT_CLEAN_START, MQTT_KEEP_ALIVE);

		        // register this client app has being able to receive messages
				mqttClient.registerSimpleHandler(this);
				
				// Subscribe to an initial topic, which is combination of client ID and device ID.
				initTopic = MQTT_CLIENT_ID + "/" + initTopic;
				subscribeToTopic(initTopic);
		
				log("Connection established to " + brokerHostName + " on topic " + initTopic);
		
				// Save start time
				mStartTime = System.currentTimeMillis();
				// Star the keep-alives
				startKeepAlives();				        
		}
		
		// Disconnect
		public void disconnect() {
			try {			
				stopKeepAlives();
				mqttClient.disconnect();
			} catch (MqttPersistenceException e) {
				log("MqttException" + (e.getMessage() != null? e.getMessage():" NULL"), e);
			}
		}
		/*
		 * Send a request to the message broker to be sent messages published with 
		 *  the specified topic name. Wildcards are allowed.	
		 */
		private void subscribeToTopic(String topicName) throws MqttException {
			
			if ((mqttClient == null) || (mqttClient.isConnected() == false)) {
				// quick sanity check - don't try and subscribe if we don't have
				//  a connection
				log("Connection error" + "No connection");	
			} else {									
				String[] topics = { topicName };
				mqttClient.subscribe(topics, MQTT_QUALITIES_OF_SERVICE);
			}
		}	
		/*
		 * Sends a message to the message broker, requesting that it be published
		 *  to the specified topic.
		 */
		private void publishToTopic(String topicName, String message) throws MqttException {		
			if ((mqttClient == null) || (mqttClient.isConnected() == false)) {
				// quick sanity check - don't try and publish if we don't have
				//  a connection				
				log("No connection to public to");		
			} else {
				mqttClient.publish(topicName, 
								   message.getBytes(),
								   MQTT_QUALITY_OF_SERVICE, 
								   MQTT_RETAINED_PUBLISH);
			}
		}		
		
		/*
		 * Called if the application loses it's connection to the message broker.
		 */
		public void connectionLost() throws Exception {
			log("Loss of connection" + "connection downed");
			stopKeepAlives();
			// null itself
			mConnection = null;
			if (isNetworkAvailable() == true) {
				reconnectIfNecessary();	
			}
		}		
		
		/*
		 * Called when we receive a message from the message broker. 
		 * 在这里处理服务器推送过来的数据
		 */
		public void publishArrived(String topicName, byte[] payload, int qos, boolean retained) {
			// Show a notification
			String s = new String(payload);
			showNotification(s);	
		}   
		
		public void sendKeepAlive() throws MqttException {
			log("Sending keep alive");
			// publish to a keep-alive topic
			publishToTopic(MQTT_CLIENT_ID + "/keepalive", mPrefs.getString(PREF_DEVICE_ID, ""));
		}		
	}
}

PushService是根据你的设备号来准确定位你的手机的，它是从SharedPreferences取得该设备号的，所以你得事先将你的设备号保存在SharedPreferences中，如下：

class PushTask extends AsyncTask<Void, Integer, Boolean> {

		@Override
		protected Boolean doInBackground(Void... params) {
			// 启动PUSH服务
			Editor editor = getSharedPreferences(PushService.TAG, MODE_PRIVATE)
					.edit();
String deviceID = Secure.getString(getContentResolver(),Secure.ANDROID_ID);
			editor.putString(PushService.PREF_DEVICE_ID, deviceID);
			editor.commit();
			try {
				PushService.actionStart(getApplicationContext());
			} catch (Exception e) {
				// TODO: handle exception
//				Log.i(tag, "启动PUSH服务失败.");
				return false;
			}
			return true;
		}

		@Override
		protected void onCancelled() {
			super.onCancelled();
		}

		@Override
		protected void onPostExecute(Boolean result) {
			Log.i(tag, result?"启动PUSH服务成功.":"启动PUSH服务失败.");
		}

		@Override
		protected void onPreExecute() {
			// 预处理
		}

		@Override
		protected void onProgressUpdate(Integer... values) {
			// 更新进度
		}
	}

PushTask task=new PushTask();
task.execute();

如果要关闭服务，只需要将下面的代码添加到想要的地方：

PushService.actionStop(getApplicationContext());

至于服务器端代码，我们使用php写的，这里请参考

Android推送通知指南

另一篇关于推送：

Android Push Notification实现信息推送使

http://www.apkbus.com/android-48367-1-1.html

• wmqtt.jar (47.5 KB)
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