[Android实例] MQTT消息推送，即时通讯

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该篇文章从eoeAndroid搬迁过来的，原文地址：[Android实例] MQTT消息推送，即时通讯

前几天刚学习了MQTT服务器搭建和如何使用MQTT进行消息推送，不清楚的同学可以查看[Android实例] MQTT协议，Android消息推送

MQTT不仅可以做消息推送，还能够实现即时通讯，今天没事做了个DEMO贡献个大家

主要代码：

接收消息展示：

@Override    public void onStart(Intent intent, int startId) {        // TODO Auto-generated method stub        try {            mqttClient = new MqttClient(Constant.MQTT_SERVERURL, Constant.CLIENT_ID,                    new MemoryPersistence());            mqttClient.setCallback(new MqttCallback() {                @Override                public void messageArrived(String topicName, MqttMessage message)                        throws Exception {                    // TODO Auto-generated method stub                    String str = new String(message.getPayload());                    if (str != null && !str.equals("")) {                        if (MainActivity.handler != null) {                            Message msg = new Message();                            msg.obj = str;                            msg.what = 0;                            MainActivity.handler.sendMessage(msg);                        }                    }                }                @Override                public void deliveryComplete(IMqttDeliveryToken token) {                    // TODO Auto-generated method stub                }                @Override                public void connectionLost(Throwable cause) {                    // TODO Auto-generated method stub                }            });            mqttClient.connect();            mqttClient.subscribe(Constant.CLIENT_TOPIC);        } catch (MqttException e) {            // TODO Auto-generated catch block            Log.i("Log", e.getMessage());            e.printStackTrace();        }    }

handler = new Handler() {            @Override            public void handleMessage(Message msg) {                // TODO Auto-generated method stub                super.handleMessage(msg);                textView.setText(textView.getText().toString() + "\n"                        + Constant.SERVER_ID + "：" + msg.obj);            }        };

发送消息：

String msg = editText.getText().toString();                if (msg == null || msg.equals("")) {                    Toast.makeText(MainActivity.this, "输入内容不能为空",                            Toast.LENGTH_SHORT).show();                    return;                }                try {                    MqttClient client = new MqttClient(Constant.MQTT_SERVERURL,                            MqttClient.generateClientId(),                            new MemoryPersistence());                    client.connect();                    MqttTopic temperatureTopic = client                            .getTopic(Constant.SERVER_TOPIC);                    MqttMessage message = new MqttMessage(msg.getBytes());                    temperatureTopic.publish(message);                    client.disconnect();                    textView.setText(textView.getText().toString() + "\n"                            + "===>本地增加---" + Constant.CLIENT_ID + "：" + msg);                    editText.setText("");                } catch (MqttException e) {                    // TODO Auto-generated catch block                    e.printStackTrace();                }

由于是简易demo，这里有一点要注意的是，用两个模拟器测试的时候，demo里面的Constant.java类需要进行根据不同的模拟器有选择去注释
public static String MQTT_SERVERURL = “tcp://192.168.0.79:1883”;

/***************************用户二安装的时候注释掉************************************/public static String CLIENT_ID = "用户一";public static String CLIENT_TOPIC = "接受用户二信息";public static String SERVER_ID = "用户二";public static String SERVER_TOPIC = "接受用户一信息";/***************************用户一安装的时候注释掉***********************************/

// public static String CLIENT_ID = “用户二”;
// public static String CLIENT_TOPIC = “接受用户一信息”;
//
// public static String SERVER_ID = “用户一”;
// public static String SERVER_TOPIC = “接受用户二信息”;

代码里面如果有不合理的地方敬请见谅，毕竟是个简易Demo，各位看官别太在意

这里写图片描述

下载地址：项目代码

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