502-STM32+Air724UG基本控制篇(自建物联网平台)-移植使用-移植AndroidMQTT底层包到自己的工程项目

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新建工程

 

 

安装MQTT的Jar包

1.第一种方式

implementation 'org.eclipse.paho:org.eclipse.paho.client.mqttv3:1.2.0'

2.第二种,我准备好了jar包,可以直接导入 jar包

拷贝到自己工程的libs里面

 

 

把MyMqttClient.java 文件放到自己的工程

1.修改MQTT信息

2,增加网络权限

<uses-permission android:name="android.permission.INTERNET" />

连接MQTT

该代码写一次即可,后期断线自动重连

MyMqttClient.sharedCenter().setConnect();

订阅主题

MyMqttClient.sharedCenter().setSubscribe("1111",0);//订阅主题1111,消息等级0

建议使用方式

public class MainActivity extends AppCompatActivity {
    //定时器用于轮训订阅主题
    private Timer timerSubscribeTopic = null;
    private TimerTask TimerTaskSubscribeTopic = null;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        MyMqttClient.sharedCenter().setConnect();

        /**
         * 订阅主题成功回调
         */
        MyMqttClient.sharedCenter().setOnServerSubscribeCallback(new MyMqttClient.OnServerSubscribeSuccessCallback() {
            @Override
            public void callback(String Topic, int qos) {
                if (Topic.equals("1111")){//订阅1111成功
                    stopTimerSubscribeTopic();//订阅到主题,停止订阅
                }
            }
        });
        startTimerSubscribeTopic();//定时订阅主题
    }

    /**
     * 定时器每隔1S尝试订阅主题
     */
    private void startTimerSubscribeTopic(){
        if (timerSubscribeTopic == null) {
            timerSubscribeTopic = new Timer();
        }
        if (TimerTaskSubscribeTopic == null) {
            TimerTaskSubscribeTopic = new TimerTask() {
                @Override
                public void run() {
                    MyMqttClient.sharedCenter().setSubscribe("1111",0);//订阅主题1111,消息等级0
                }
            };
        }
        if(timerSubscribeTopic != null && TimerTaskSubscribeTopic != null )
            timerSubscribeTopic.schedule(TimerTaskSubscribeTopic, 0, 1000);
    }

    private void stopTimerSubscribeTopic(){
        if (timerSubscribeTopic != null) {
            timerSubscribeTopic.cancel();
            timerSubscribeTopic = null;
        }
        if (TimerTaskSubscribeTopic != null) {
            TimerTaskSubscribeTopic.cancel();
            TimerTaskSubscribeTopic = null;
        }
    }

    //当活动不再可见时调用
    @Override
    protected void onStop()
    {
        super.onStop();
        stopTimerSubscribeTopic();//停止定时器订阅
    }

    /**
     * 当处于停止状态的活动需要再次展现给用户的时候，触发该方法
     */
    @Override
    protected void onRestart() {
        super.onRestart();
        startTimerSubscribeTopic();//定时订阅主题
    }

    @Override
    protected void onPause() {
        super.onPause();
        stopTimerSubscribeTopic();
    }
}

取消订阅

MyMqttClient.sharedCenter().setUnSubscribe("1111");//取消订阅主题1111

接收消息

哪个文件需要获取MQTT数据,只需要按照下面的方式写上即可!

MyMqttClient.sharedCenter().setOnServerReadStringCallback(new MyMqttClient.OnServerReadStringCallback() {
            @Override//Topic:主题  Msg.toString():接收的消息  MsgByte:16进制消息
            public void callback(String Topic, MqttMessage Msg, byte[] MsgByte) {
                Log.e("MqttMsg", "Topic: "+Topic+" Msg"+Msg.toString() );
            }
        });

发布消息

1.发布字符串消息

MyMqttClient.sharedCenter().setSendData("2222","msg",0,false);//发送字符串消息

2222:发布的主题 msg:发布的消息 0:消息等级 false:不需要服务器记录

2.发布16进制消息

byte[] bytes= new byte[2];

bytes[0] = 0x03;

bytes[1] = 0x55;

MyMqttClient.sharedCenter().setSendData("3333",bytes,0,false);

监听MQTT连接状态

/*连接上MQTT*/
        MyMqttClient.sharedCenter().setOnServerConnectedCallback(new MyMqttClient.OnServerConnectedCallback() {
            @Override
            public void callback() {

            }
        });
        /*和MQTT服务器断开连接*/
        MyMqttClient.sharedCenter().setOnServerDisConnectedCallback(new MyMqttClient.OnServerDisConnectedCallback() {
            @Override
            public void callback(Throwable e) {

            }
        });