I am writing a straightforward mqtt client. For some strange reason Android studio 3.1.1 can't resolve any member function of MqttConnectOptions.
None of the members functions of MqttConnectOptions are recognized by the compiler.
All the examples I can find on the web use the MqttConnectOptions members. I'm baffled!
What simple thing am I missing?
package com.grayraven.garage; import android.content.Context; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.util.Log; import org.eclipse.paho.android.service.MqttAndroidClient; import org.eclipse.paho.client.mqttv3.IMqttActionListener; import org.eclipse.paho.client.mqttv3.IMqttToken; import org.eclipse.paho.client.mqttv3.MqttClient; import org.eclipse.paho.client.mqttv3.MqttConnectOptions; import org.eclipse.paho.client.mqttv3.MqttException; public class MainActivity extends AppCompatActivity { final String TAG = "Garage_Main"; private static Context mContext = GarageApp.getAppContext(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mContext = this.getApplicationContext(); setContentView(R.layout.activity_main); } final String broker = "10.211.1.127:1883"; final String password = "monkey123"; final String subscriptionTopic = "garage_door"; MqttConnectOptions options = new MqttConnectOptions(); options.setUserName("pi"); //cannot resolve setUserName!!! options.setPassword(password.toCharArray()); //cannot resolve setPassword!!!! String clientId = MqttClient.generateClientId(); MqttAndroidClient client = new MqttAndroidClient(mContext, broker, clientId); /// rest of code works so omitted for clarity app build.gradle:
apply plugin: 'com.android.application' android { compileSdkVersion 26 defaultConfig { applicationId "com.grayraven.garage" minSdkVersion 22 targetSdkVersion 26 versionCode 1 versionName "1.0" testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" } buildTypes { release { minifyEnabled false proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' } } } repositories { maven { url "https://repo.eclipse.org/content/repositories/paho-releases/" } } dependencies { implementation fileTree(dir: 'libs', include: ['*.jar']) implementation 'com.android.support:appcompat-v7:26.1.0' implementation 'com.android.support.constraint:constraint-layout:1.1.0' testImplementation 'junit:junit:4.12' androidTestImplementation 'com.android.support.test:runner:1.0.1' androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1' implementation('org.eclipse.paho:org.eclipse.paho.android.service:1.0.2') { exclude module: 'support-v4' } } 2 Answers
Answers 1
Your code to import MQTT dependencies for Android are not correct. Please try this one.
Step 1: Remove these lines from your build.gradle file
repositories { maven { url "https://repo.eclipse.org/content/repositories/paho-releases/" } } implementation('org.eclipse.paho:org.eclipse.paho.android.service:1.0.2') { exclude module: 'support-v4' } Step 2: Add these lines to build.gradle file of your Android Studio project. This is top-level build.gradle file not the one in app forder where you declare all dependencies of your project.
repositories { maven { url "https://repo.eclipse.org/content/repositories/paho-snapshots/" } } Step 3: Add these lines to build.gradle file of your Android app
dependencies { compile 'org.eclipse.paho:org.eclipse.paho.client.mqttv3:1.1.0' compile 'org.eclipse.paho:org.eclipse.paho.android.service:1.1.1' } Finally Clean, Sync then Build your project.
Answers 2
It was just a rookie mistake, I was trying to set the options outside the code section of the main activity.
Never mind.
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