Managed to solve this.
The problem was that android-support-v4.jar was in the libs folder, and it was also listed as a dependency in the build.gradle, thus creating a conflict.
Deleting the .jar file solved this error.
Google Analytics is working now. My build.gradle looks like this:
buildscript { repositories { jcenter() } dependencies { classpath 'com.android.tools.build:gradle:1.5.0' classpath 'com.google.gms:google-services:2.0.0-beta6' } } allprojects { repositories { jcenter() } } apply plugin: 'com.android.application' dependencies { compile fileTree(dir: 'libs', include: ['*.jar']) compile 'com.android.support:appcompat-v7:23.2.0' compile 'com.android.support:support-v4:23.2.0' compile 'com.google.android.gms:play-services-analytics:8.4.0' } android { /******************************************************* * The following variables: * - androidBuildToolsVersion, * - androidCompileSdkVersion * - qt5AndroidDir - holds the path to qt android files * needed to build any Qt application * on Android. * * are defined in gradle.properties file. This file is * updated by QtCreator and androiddeployqt tools. * Changing them manually might break the compilation! *******************************************************/ compileSdkVersion androidCompileSdkVersion.toInteger() buildToolsVersion androidBuildToolsVersion sourceSets { main { manifest.srcFile 'AndroidManifest.xml' java.srcDirs = [qt5AndroidDir + '/src', 'src', 'java'] aidl.srcDirs = [qt5AndroidDir + '/src', 'src', 'aidl'] res.srcDirs = [qt5AndroidDir + '/res', 'res'] resources.srcDirs = ['src'] renderscript.srcDirs = ['src'] assets.srcDirs = ['assets'] jniLibs.srcDirs = ['libs'] } } lintOptions { abortOnError false } } apply plugin: 'com.google.gms.google-services'