[英]Android Studio - MQTT not connecting
我剛剛開始學習在 Android Studio 中使用 MQTT 協議。 使用mosquitto代理,我能夠在發布/訂閱窗口之間交換消息。 但是,當我通過 android studio 向代理發送消息時,應用程序構建成功,但代理端沒有任何顯示,系統打印連接失敗。 相同的代碼在 eclipse java 應用程序上運行良好,但在 android 上不起作用,盡管已添加所需的庫和依賴項。
請幫助,我在這個基本步驟中缺少什么,以便我可以繼續學習。 謝謝!
app-build.gradle
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:25.2.0'
compile 'com.android.support.constraint:constraint-layout:1.0.2'
testCompile 'junit:junit:4.12'
// have added following dependencies
provided 'com.google.android.things:androidthings:0.2-devpreview'
provided 'com.google.android.things:androidthings:0.1-devpreview'
compile 'org.eclipse.paho:org.eclipse.paho.client.mqttv3:1.0.2'
}
項目-build.gradle
repositories {
jcenter()
maven {
url "https://repo.eclipse.org/content/repositories/paho-snapshots/"
}
}
AndroidManifest.xml
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.zoha.mqttandroidiot">
<!-- Permissions the Application Requires -->
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".HomeActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
<!-- Launch activity automatically on boot -->
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.IOT_LAUNCHER"/>
<category android:name="android.intent.category.DEFAULT"/>
</intent-filter>
</activity>
<service android:name="org.eclipse.paho.android.service.MqttService"/>
</application>
</manifest>
家庭活動
public class HomeActivity extends AppCompatActivity{
MqttAndroidClient client;
// private static final MemoryPersistence persistence = new MemoryPersistence();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final MqttAndroidClient mqttAndroidClient = new MqttAndroidClient(this.getApplicationContext(), "tcp://localhost:1883", "androidSampleClient");
mqttAndroidClient.setCallback(new MqttCallback() {
@Override
public void connectionLost(Throwable cause) {
System.out.println("Connection was lost!");
}
@Override
public void messageArrived(String topic, MqttMessage message) throws Exception {
System.out.println("Message Arrived!: " + topic + ": " + new String(message.getPayload()));
}
@Override
public void deliveryComplete(IMqttDeliveryToken token) {
System.out.println("Delivery Complete!");
}
});
try {
mqttAndroidClient.connect(null, new IMqttActionListener() {
@Override
public void onSuccess(IMqttToken asyncActionToken) {
System.out.println("Connection Success!");
try {
System.out.println("Subscribing to /test");
mqttAndroidClient.subscribe("/test", 0);
System.out.println("Subscribed to /test");
System.out.println("Publishing message..");
mqttAndroidClient.publish("/test", new MqttMessage("Hello world testing..!".getBytes()));
} catch (MqttException ex) {
}
}
@Override
public void onFailure(IMqttToken asyncActionToken, Throwable exception) {
System.out.println("Connection Failure!");
}
});
} catch (MqttException ex) {
}
}
}
好的,所以您需要兩個庫才能在 Android 中使用 MQTT。 一個是 mqtt paho 客戶端,另一個是 Android 服務庫。
compile 'org.eclipse.paho:org.eclipse.paho.android.service:1.0.2'
compile 'org.eclipse.paho:org.eclipse.paho.client.mqttv3:1.0.2'
然后,使用MqttAndroidClient
而不是MqttClient
。
new MqttAndroidClient(...)
。
如果有幫助,我在這里發布了一個完整的 Android MQTT 服務示例。
編輯:完整活動示例
(1) MemoryPersistence
創建新加入時MqttAndroidClient
。
(2) MqttAndroidClient
( .connect()
方法中添加了兩個參數( mqttConnectOptions
和null
)。
(3) 另外,在onFailure()
上打印錯誤
public class HomeActivity extends AppCompatActivity {
private MqttAndroidClient client;
private final MemoryPersistence persistence = new MemoryPersistence();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final MqttAndroidClient mqttAndroidClient = new MqttAndroidClient(this.getApplicationContext(), "tcp://localhost:1883", "androidSampleClient", persistence);
mqttAndroidClient.setCallback(new MqttCallback() {
@Override
public void connectionLost(Throwable cause) {
System.out.println("Connection was lost!");
}
@Override
public void messageArrived(String topic, MqttMessage message) throws Exception {
System.out.println("Message Arrived!: " + topic + ": " + new String(message.getPayload()));
}
@Override
public void deliveryComplete(IMqttDeliveryToken token) {
System.out.println("Delivery Complete!");
}
});
MqttConnectOptions mqttConnectOptions = new MqttConnectOptions();
mqttConnectOptions.setCleanSession(true);
try {
mqttAndroidClient.connect(mqttConnectOptions, null, new IMqttActionListener() {
@Override
public void onSuccess(IMqttToken asyncActionToken) {
System.out.println("Connection Success!");
try {
System.out.println("Subscribing to /test");
mqttAndroidClient.subscribe("/test", 0);
System.out.println("Subscribed to /test");
System.out.println("Publishing message..");
mqttAndroidClient.publish("/test", new MqttMessage("Hello world testing..!".getBytes()));
} catch (MqttException ex) {
}
}
@Override
public void onFailure(IMqttToken asyncActionToken, Throwable exception) {
System.out.println("Connection Failure!");
System.out.println("throwable: " + exception.toString());
}
});
} catch (MqttException ex) {
System.out.println(ex.toString());
}
}
}
我只想添加評論,但我的代表太低了...所以我將其發布為答案。
你說你一切正常,但由於IllegalArgumentException
無法連接。 我遇到了同樣的問題,發現您還需要定義協議。 所以不要嘗試"192.168.0.103:1883"
:
String serverURI = "tcp://192.168.0.103:1883"
從我讀到的你已經做了其他必要的步驟,但為了給出一個完整的答案:
編輯AndroidManifest.xml
以包括:
<service android:name="org.eclipse.paho.android.service.MqttService" />
(從application
標簽內部)
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
編輯build.gradle
以包含(在dependencies
部分):
compile 'org.eclipse.paho:org.eclipse.paho.client.mqttv3:1.1.1'
compile 'org.eclipse.paho:org.eclipse.paho.android.service:1.1.1'
使用MqttAndroidClient
(不是MqttClient
)
將您的代碼放在“onSuccess”回調中,以避免由於方法異步而導致的任何問題(如 THEPATEL 的回答所示):
MqttConnectOptions mqttConnectOptions = new MqttConnectOptions(); mqttConnectOptions.setKeepAliveInterval(60);//seconds mqttConnectOptions.setCleanSession(true); mqttConnectOptions.setAutomaticReconnect(true); mqttAndroidClient.connect(mqttConnectOptions, null, new IMqttActionListener() { @Override public void onSuccess(IMqttToken asyncActionToken) { //Treat success here (subscribe, publish etc) } @Override public void onFailure(IMqttToken asyncActionToken, Throwable exception) { //Treat failure here } });
我在 Android 設備上遇到了 MQTT 發布者同樣的問題。 在從 android 模擬器引用tcp://localhost:1883
,我必須使用http://10.0.2.2:1883
因為模擬器在其自己的 VM 上運行,而 localhost 將是模擬器自己的環回地址。
我遇到了同樣的錯誤,但我已經解決了。 這是工作代碼。
在 gradle 中:
compile 'org.eclipse.paho:org.eclipse.paho.client.mqttv3:1.1.0'
compile 'org.eclipse.paho:org.eclipse.paho.android.service:1.1.0'
在清單中:
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
應用程序內的服務標簽:
<service android:name="org.eclipse.paho.android.service.MqttService" >
</service>
活動代碼:
MqttAndroidClient client;
Button btnsub,btnpublish;
連接 Mqtt 客戶端:
String clientId = MqttClient.generateClientId();
client = new MqttAndroidClient(getApplicationContext(), "tcp://www.domain.in/ip:11883",clientId);
client.connect().setActionCallback(new IMqttActionListener() {
@Override
public void onSuccess(IMqttToken asyncActionToken) {
// We are connected
}
@Override
public void onFailure(IMqttToken asyncActionToken, Throwable exception) {
}
});
要訂閱按鈕單擊:
client.subscribe("topic", 0, null, new IMqttActionListener() {
@Override
public void onSuccess(IMqttToken asyncActionToken) {
}
@Override
public void onFailure(IMqttToken asyncActionToken, Throwable exception) {
}
});
client.subscribe("topic", 0, new IMqttMessageListener() {
@Override
public void messageArrived(String topic, MqttMessage message) throws Exception {
}
});
點擊按鈕發布:
MqttMessage message = new MqttMessage();
message.setPayload("message".getBytes());
client.publish("topic", message);
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