MQTT实现消息推送
- 后台:websocket (后台自己架构)
- (as导包:):https://github.com/eclipse/paho.mqtt.android
2.客户端
这我就不多做介绍了，直接贴代码了
在Android客户端中MainAcitvity的代码如下：
package com.hxht.testmqttclient;
import android.app.Notification;
import android.app.NotificationManager;
import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.view.KeyEvent;
import android.widget.RemoteViews;
import android.widget.TextView;
import android.widget.Toast;
import org.eclipse.paho.client.mqttv3.IMqttDeliveryToken;
import org.eclipse.paho.client.mqttv3.MqttCallback;
import org.eclipse.paho.client.mqttv3.MqttClient;
import org.eclipse.paho.client.mqttv3.MqttConnectOptions;
import org.eclipse.paho.client.mqttv3.MqttException;
import org.eclipse.paho.client.mqttv3.MqttMessage;
import org.eclipse.paho.client.mqttv3.persist.MemoryPersistence;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
@SuppressWarnings("all")
public class MainActivity extends AppCompatActivity {
private TextView resultTv;
private String host = "tcp://192.168.14.206:1883"; //地址 主号 需要改
private String userName = "admin"; //用户名 需要改
private String passWord = "password"; //密码 需要改
private int i = 1;
private Handler handler;
private MqttClient client;
private String myTopic = "test/topic"; //话题 需要改
private MqttConnectOptions options;
private ScheduledExecutorService scheduler;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
resultTv = (TextView) findViewById(R.id.result);
init();
handler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
if (msg.what == 1) {
Toast.makeText(MainActivity.this, (String) msg.obj,
Toast.LENGTH_SHORT).show();
NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
Notification notification = new Notification(R.drawable.icon, "Mqtt即时推送", System.currentTimeMillis());
notification.contentView = new RemoteViews("com.hxht.testmqttclient", R.layout.activity_notification);
notification.contentView.setTextViewText(R.id.tv_desc, (String) msg.obj);
notification.defaults = Notification.DEFAULT_SOUND;
notification.flags = Notification.FLAG_AUTO_CANCEL;
manager.notify(i++, notification);
} else if (msg.what == 2) {
System.out.println("连接成功");
Toast.makeText(MainActivity.this, "连接成功", Toast.LENGTH_SHORT).show();
try {
client.subscribe(myTopic, 1);
} catch (Exception e) {
e.printStackTrace();
}
} else if (msg.what == 3) {
Toast.makeText(MainActivity.this, "连接失败，系统正在重连", Toast.LENGTH_SHORT).show();
System.out.println("连接失败，系统正在重连");
}
}
};
startReconnect();
}
private void startReconnect() {
scheduler = Executors.newSingleThreadScheduledExecutor();
scheduler.scheduleAtFixedRate(new Runnable() {
@Override
public void run() {
if (!client.isConnected()) {
connect();
}
}
}, 0 * 1000, 10 * 1000, TimeUnit.MILLISECONDS);
}
private void init() {
try {
//host为主机名，test为clientid即连接MQTT的客户端ID，一般以客户端唯一标识符表示，MemoryPersistence设置clientid的保存形式，默认为以内存保存
client = new MqttClient(host, "test",
new MemoryPersistence());
//MQTT的连接设置
options = new MqttConnectOptions();
//设置是否清空session,这里如果设置为false表示服务器会保留客户端的连接记录，这里设置为true表示每次连接到服务器都以新的身份连接
options.setCleanSession(true);
//设置连接的用户名
options.setUserName(userName);
//设置连接的密码
options.setPassword(passWord.toCharArray());
// 设置超时时间 单位为秒
options.setConnectionTimeout(10);
// 设置会话心跳时间 单位为秒 服务器会每隔1.5*20秒的时间向客户端发送个消息判断客户端是否在线，但这个方法并没有重连的机制
options.setKeepAliveInterval(20);
//设置回调
client.setCallback(new MqttCallback() {
@Override
public void connectionLost(Throwable cause) {
//连接丢失后，一般在这里面进行重连
System.out.println("connectionLost----------");
}
@Override
public void deliveryComplete(IMqttDeliveryToken token) {
//publish后会执行到这里
System.out.println("deliveryComplete---------"
+ token.isComplete());
}
@Override
public void messageArrived(String topicName, MqttMessage message)
throws Exception {
//subscribe后得到的消息会执行到这里面
System.out.println("messageArrived----------");
Message msg = new Message();
msg.what = 1;
msg.obj = topicName + "---" + message.toString();
handler.sendMessage(msg);
}
});
} catch (Exception e) {
e.printStackTrace();
}
}
private void connect() {
new Thread(new Runnable() {
@Override
public void run() {
try {
client.connect(options);
Message msg = new Message();
msg.what = 2;
handler.sendMessage(msg);
} catch (Exception e) {
e.printStackTrace();
Message msg = new Message();
msg.what = 3;
handler.sendMessage(msg);
}
}
}).start();
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (client != null && keyCode == KeyEvent.KEYCODE_BACK) {
try {
client.disconnect();
} catch (Exception e) {
e.printStackTrace();
}
}
return super.onKeyDown(keyCode, event);
}
@Override
protected void onDestroy() {
super.onDestroy();
try {
scheduler.shutdown();
client.disconnect();
} catch (MqttException e) {
e.printStackTrace();
}
}
}