gradle behind proxy in Android Studio 1.3
Perhaps you also need to configure the https settings
systemProp.https.proxyHost=www.somehost.org
systemProp.https.proxyPort=8080
systemProp.https.proxyUser=userid
systemProp.https.proxyPassword=password
systemProp.https.nonProxyHosts=*.nonproxyrepos.com|localhost
After finding an answer for days...
As Lance said, you need to set in the gradle.properties settings for https (I write details here for further visitors)
systemProp.https.proxyHost=some.proxy.adress.com
systemProp.https.proxyPort=3128
At the end, your gradle.properties file (on the root of the project) will be :
systemProp.http.proxyHost=some.proxy.adress.com
systemProp.http.proxyPort=3128
systemProp.https.proxyHost=some.proxy.adress.com
systemProp.https.proxyPort=3128