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I'm trying to use the Dialogflow v2 beta Java API in Android Studio, however, I'm getting an IOException stating that the Application Default Credentials are not available.

I've downloaded the service account keys with the credentials for accessing Dialogflow and have set the GOOGLE_APPLICATION_CREDENTIALS environmental variable from within the command prompt, in the control panel system settings, and from within the terminal window inside Android Studio. In the terminal (both inside and outside Android Studio), printing the GOOGLE_APPLICATION_CREDENTIALS displays the correct json file I set it to, however, when I use

System.getenv("GOOGLE_APPLICATION_CREDENTIALS") 

in my Java code, it returns null. If it is this that's causing my issue, how do I provide Java with the correct value?

I've tried restarting both my computer and Android Studio after setting the environmental variable. I've also tried starting Android Studio from the command prompt with the variable set.

The code I'm running is the sample code found here.

Here are my dependencies. I've tried updating them to all the latest versions but it seems to create incompatibility errors. I'm reluctant to spend too much time trying to solve these incompatibility errors if the problem is due to something else.

    //noinspection GradleCompatible

implementation 'com.android.support:design:28.0.0'

implementation 'com.github.bumptech.glide:glide:4.7.1'

implementation 'de.hdodenhof:circleimageview:1.3.0'

implementation 'com.android.support:appcompat-v7:28.0.0'



// Google

implementation 'com.google.android.gms:play-services-auth:15.0.1'

implementation 'com.google.android.gms:play-services-ads:15.0.0'



// Firebase

implementation 'com.google.firebase:firebase-analytics:15.0.2'

implementation 'com.google.firebase:firebase-database:15.0.1'

implementation 'com.google.firebase:firebase-storage:15.0.2'

implementation 'com.google.firebase:firebase-auth:15.1.0'

implementation 'com.google.firebase:firebase-config:15.0.2'

implementation 'com.google.android.gms:play-services-appinvite:15.0.2'

implementation 'com.google.firebase:firebase-messaging:15.0.2'

implementation 'com.google.android.gms:play-services-ads:15.0.1'

implementation 'com.google.firebase:firebase-appindexing:15.0.1'

implementation 'com.google.firebase:firebase-analytics:15.0.2'

implementation 'com.google.firebase:firebase-firestore:15.0.0'

implementation 'com.google.firebase:firebase-functions:15.0.0'



// version 17 is not compatible with FirebaseUI 3.3.1

implementation 'com.google.firebase:firebase-messaging:15.0.0'



// Dialogflow

implementation 'com.google.cloud:google-cloud-dialogflow:0.74.0-alpha'

implementation 'io.grpc:grpc-okhttp:1.16.1'

implementation 'ai.api:sdk:2.0.7@aar'

implementation 'ai.api:libai:1.6.12'



// Firebase UI

implementation "com.firebaseui:firebase-ui-firestore:3.3.1"



//Crashlytics

implementation 'com.crashlytics.sdk.android:crashlytics:2.9.5'



// Testing dependencies

androidTestImplementation 'junit:junit:4.12'

androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'

androidTestImplementation 'com.android.support.test:runner:1.0.2'

androidTestImplementation 'com.android.support:support-annotations:28.0.0'

Let me know if there's any other information that might be useful. I'm running Android Studio 3.2.1 on Windows 10.