在app中的build.gradle中加入如下代码，
configurations {
all*.exclude group: ‘com.google.code.gson‘
all*.exclude group: ‘com.squareup.okhttp3‘
all*.exclude group: ‘com.squareup.okio‘
all*.exclude group: ‘com.android.support‘,module:‘support-v13‘
}
如图
Error: Program type already present: okhttp3.Authenticator$1
原文：https://www.cnblogs.com/sea-stream/p/10596895.html