How to use new Dialogflow SDK V2 in Android

Question

I'm a bit confused about the migration to Dialogflow V2: I have an Android app using https://github.com/dialogflow/dialogflow-android-client (1) that makes voice recognition via "AIService" and request to my Dialogflow Agent V1.

Now with the release of Dialogflow V2, the docs point me to use: https://github.com/GoogleCloudPlatform/google-cloud-java/tree/master/google-cloud-dialogflow

But I can not see correspondence to AIService in this new SDK for Java... all I've found is this: https://googlecloudplatform.github.io/google-cloud-java/latest/apidocs/index.html?com/google/cloud/dialogflow/v2/package-summary.html

My question is: Does actual dialogflow Android client (1) works with V2 Agents? If the answer is "yes", why Google put this in the docs?:

Dialogflow's legacy V1 SDKs can be found below. If you are starting a new project please use Dialogflow's V2 and V2 SDKs listed above, as Dialogflow's V1 API will be turned down on April 10, 2019.

Help will be appreciated, Cheers