首先物联网协议mqtt协议是基于tcp/ip协议的，使用了官方的mqttclient框架
代码语言：javascript复制/*
*初始化mqttclient
*/
private void init() {
try {
//MQTT的连接设置
options = new MqttConnectOptions();
//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(new Ip().host, username,
new MemoryPersistence());
//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(false);
//options.setWill(myTopic,null,2,false);
//设置连接的用户名
options.setUserName(login_token);
//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(60);
//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 {
byte[] message1 = message.getPayload();
// subscribe后得到的消息会执行到这里面
System.out.println("messageArrived----------" message1[0] Arrays.toString(message1));
System.out.println(message1[0] == 5);
String id = new String(subBytes(message1, 1, 16), "UTF-8");
System.out.print("mqtt收到的id" id);
DeviceList device = getBookById(id);
System.out.print("device" device.getName());
String name = device.getName();
String gName = device.getgName();
String type = device.getType();
System.out.print("名字为" name gName);
/**
* 使用handler发送matt接收的消息，格式为二进制数据
* */
Message msg = new Message();
msg.what = 1;
if (message1[0] == 1) {
// msg.obj = name "设备心跳";
// handler.sendMessage(msg);
return;
}
if (message1[0] == 2) {
msg.obj = gName "" name "报警";
msg.arg1 = Integer.parseInt(type);
handler.sendMessage(msg);
return;
}
if (message1[0] == 3) {
msg.obj = gName "" name "上线";
handler.sendMessage(msg);
return;
}
if (message1[0] == 4) {
msg.obj = gName "" name "离线";
handler.sendMessage(msg);
return;
}
if (message1[0] == 5) {
if (message1[17] == 0) {
msg.obj = gName "" name "关门";
} else {
msg.obj = gName "" name "开门";
}
handler.sendMessage(msg);
return;
}
if (message1[0] == 20 && message1[17] 0 && message1[17] < 20) {
msg.obj = name "电池电量: " message1[17] "%";
handler.sendMessage(msg);
System.out.println("电池:" name "电池电量: " message1[17] "%");
return;
}
if (message1[17] 0) {
SharedPreferences sp = getActivity().getSharedPreferences(id, getActivity().MODE_PRIVATE);
// 获得sp的编辑器
SharedPreferences.Editor ed = sp.edit();
// 以键值对的显示将用户名和密码保存到sp中
ed.putString("battery", String.valueOf(message1[17]));
// 提交用户名和密码
ed.commit();
}
}
});
} catch (Exception e) {
e.printStackTrace();
}
}
public byte[] subBytes(byte[] src, int begin, int count) {
byte[] bs = new byte[count];
System.arraycopy(src, begin, bs, 0, count);
return bs;
}
//根据id拿到属性为id的Book对象。
public static DeviceList getBookById(String id) {
DeviceList book = new DeviceList();
book.setId(id);//设置传入的id值
//books.indexOf()根据id比较对象是否相等
return deviceList1.get(deviceList1.indexOf(book));
//返回关联id的Book对象。
}
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();
}
protected boolean onKeyDown(int keyCode, KeyEvent event) {
if (client != null && keyCode == KeyEvent.KEYCODE_BACK) {
try {
client.disconnect();
} catch (Exception e) {
e.printStackTrace();
}
}
return super.getActivity().onKeyDown(keyCode, event);
}
@Override
public void onDestroy() {
super.onDestroy();
try {
scheduler.shutdown();
client.disconnect();
} catch (MqttException e) {
e.printStackTrace();
}
}
private void startReconnect() {
scheduler = Executors.newSingleThreadScheduledExecutor();
scheduler.scheduleAtFixedRate(new Runnable() {
@Override
public void run() {
if (!client.isConnected()) {
connect();
}
}
}, 0 * 1000, 10 * 1000, TimeUnit.MILLISECONDS);
}
其次使用handlermessage接收消息，并已notifacation的形式展示在通知栏页面
handler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
if (msg.what == 1) {
NotificationManager manager = (NotificationManager) getActivity().getSystemService(Context.NOTIFICATION_SERVICE);
Notification myNotify = new Notification();
myNotify.icon = R.drawable.logo;
myNotify.tickerText = "新消息";
myNotify.when = System.currentTimeMillis();
//使用默认的声音
myNotify.defaults |= Notification.DEFAULT_SOUND;
//使用默认的震动
myNotify.defaults |= Notification.DEFAULT_VIBRATE;
//使用默认的声音、振动、闪光
myNotify.defaults = Notification.DEFAULT_ALL;
// myNotify.flags=Notification.FLAG_AUTO_CANCEL;
// myNotify.flags = Notification.FLAG_NO_CLEAR;// 不能够自动清除
RemoteViews rv = new RemoteViews(getActivity().getPackageName(),
R.layout.activity_notification1);
rv.setTextViewText(R.id.tv_desc, (String) msg.obj);
myNotify.contentView = rv;
Intent intent = new Intent(getActivity(), MainActivity.class);
// intent.addCategory(Intent.CATEGORY_LAUNCHER);
// intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
android.app.PendingIntent contentIntent = android.app.PendingIntent.getActivity(getActivity(), 0,
intent, 0);
myNotify.contentIntent = contentIntent;
manager.notify(i1 , myNotify);
PowerManager pm = (PowerManager) getActivity().getSystemService(Context.POWER_SERVICE);
PowerManager.WakeLock wakeLock = pm.newWakeLock(PowerManager.ACQUIRE_CAUSES_WAKEUP |
PowerManager.SCREEN_DIM_WAKE_LOCK, "target");
boolean screen = pm.isScreenOn();
if (!screen) {//如果灭屏
wakeLock.acquire();
wakeLock.release();
}
refresh();
} else if (msg.what == 2) {
System.out.println("连接成功");
System.out.print("连接成功大小" listDatas2.size());
try {
client.subscribe(myTopic, 1);
client.subscribe(myTopic1, 1);
} catch (MqttException 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");
}
}
};以上这篇安卓开发之mqtt协议实例代码就是小编分享给大家的全部内容了，希望能给大家一个参考。
