Java MQTT Android Studio和Raspberry PI代理

我正在学习MQTT和Android Studio。 我想在Android Studio中制作一个简单的应用程序，但我已经奋斗了4天了，我无法应付

应用说明： 1按钮-->按下-->发送至mqtt主题/消息（“mqtt”/“测试”） 就这些

Mqtt Broker = rpi (IP: namerpibrok.ddns.net ) 

代理工作正常，不需要密码或用户名

问题在于应用——这是我第一次使用Android Studio

我做了页面上描述的所有事情：

现在，当我按下按钮。。。。什么也没发生

    MqttAndroidClient client;

    private static final String TAG = "LOG";

    // Used to load the 'native-lib' library on application startup.
static {
    System.loadLibrary("native-lib");
}

    private Object bytes;

    @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


    String clientId = MqttClient.generateClientId();
    client = new MqttAndroidClient(this.getApplicationContext(), "rpidomwroled.ddns.net:1883", clientId);

        MqttConnectOptions options = new MqttConnectOptions();

    try {
        IMqttToken token = client.connect(options);
        token.setActionCallback(new IMqttActionListener() {
            @Override
            public void onSuccess(IMqttToken asyncActionToken) {
                // We are connected
                                    Toast.makeText(MainActivity.this,"Połączono", Toast.LENGTH_LONG).show();

            }

            @Override
            public void onFailure(IMqttToken asyncActionToken, Throwable exception) {
                // Something went wrong e.g. connection timeout or firewall problems
                Toast.makeText(MainActivity.this,"Połączono", Toast.LENGTH_LONG).show();

            }
        });
    } catch (MqttException e) {
        e.printStackTrace();
    }
}



    MqttAndroidClient client;

    private static final String TAG = "LOG";

    // Used to load the 'native-lib' library on application startup.
static {
    System.loadLibrary("native-lib");
}

    private Object bytes;

    @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


    String clientId = MqttClient.generateClientId();
    client = new MqttAndroidClient(this.getApplicationContext(), "rpidomwroled.ddns.net:1883", clientId);

        MqttConnectOptions options = new MqttConnectOptions();

    try {
        IMqttToken token = client.connect(options);
        token.setActionCallback(new IMqttActionListener() {
            @Override
            public void onSuccess(IMqttToken asyncActionToken) {
                // We are connected
                                    Toast.makeText(MainActivity.this,"Połączono", Toast.LENGTH_LONG).show();

            }

            @Override
            public void onFailure(IMqttToken asyncActionToken, Throwable exception) {
                // Something went wrong e.g. connection timeout or firewall problems
                Toast.makeText(MainActivity.this,"Połączono", Toast.LENGTH_LONG).show();

            }
        });
    } catch (MqttException e) {
        e.printStackTrace();
    }
}

公共作废发布（视图五）
{
字符串topic=“mqtt”；
String payload=“mqtt”；
字节[]encodedPayload=新字节[0]；
试一试{
encodedPayload=payload.getBytes（“UTF-8”）；
MqttMessage=新MqttMessage（encodedPayload）；
发布（主题、消息）；
}捕获（不支持编码异常| MqttException e）{
e、 printStackTrace（）；
}
}
}

此代码为我工作

String topic = "mqtt";
MqttMessage message = new MqttMessage();
message.setPayload("Message from IoT dev".getBytes());
client.publish(topic, message);

你可以在家里接到回电

client.setCallback(new IoTCallbacks() {
                @Override
                public void connectionLost(Throwable cause) {

                }

                @Override
                public void messageArrived(String topic, MqttMessage message) throws Exception {

                }

                @Override
                public void deliveryComplete(IMqttDeliveryToken token) {

                }
            });

---

这个代码是为我工作的

String topic = "mqtt";
MqttMessage message = new MqttMessage();
message.setPayload("Message from IoT dev".getBytes());
client.publish(topic, message);

你可以在家里接到回电

client.setCallback(new IoTCallbacks() {
                @Override
                public void connectionLost(Throwable cause) {

                }

                @Override
                public void messageArrived(String topic, MqttMessage message) throws Exception {

                }

                @Override
                public void deliveryComplete(IMqttDeliveryToken token) {

                }
            });

---

修正了一些拼写错误并重新编写了一点。日志显示了什么？修正了一些拼写错误并重新编写了一点。日志显示了什么？