How to fix Proguard issue with Google Drive REST API

Question

I\'m using the Google Rest API v3 to connect my android app to Google Drive. When I run without Proguard (minifyEnabled=false), all is well. However, when I enable proguard

Answer 1

This one worked for me:

-keepclassmembers class * {
  @com.google.api.client.util.Key ;
}

As seen in the official google sample:

https://github.com/google/google-api-java-client-samples/blob/master/tasks-android-sample/proguard-google-api-client.txt