I found the problem :
AppProject/settings.gradle
include ':libraries:facebook', ':app'
AppProject/libraries/facebook/build.gradle
apply plugin: 'android-library'
dependencies {
compile 'com.android.support:support-v4:18.0.0'
}
AppProject/app/build.gradle
apply plugin: 'android'
dependencies {
compile 'com.android.support:support-v4:18.0.0'
compile 'com.android.support:appcompat-v7:18.0.+'
compile 'com.google.android.gms:play-services:3.1.36'
compile project(':libraries:facebook')
compile files('libs/android-async-http-1.4.3.jar')
compile files('libs/gson-2.2.4.jar')
compile files('libs/libGoogleAnalyticsV2.jar')
compile files('libs/universal-image-loader-1.8.4.jar')
compile files('libs/urbanairship-lib-3.0.0.jar')
}