Verifying using V2 only

I'm sorry that the Deprecation Guide was not more helpful to you. The Guide is not meant to totally comprehensive, platform-specific migration guide, but is instead intended to give you a qualitative sense of how API v2 differs from API v1.

To answer your question, there is no easy way to toggle seamlessly between API v1 and API v2. Each version has an entirely separate set of endpoints that are queried by entirely separate SDKs. The Android SDK that you're currently using with your app, which queries v1 endpoints, will need to be entirely swapped out with an SDK that queries v2 endpoints.

The code in your app that interfaces with the v1 Android SDK will also need to change as well. Fortunately, the mapping between v1 and v2 endpoints is relatively tight and straightforward, so in most cases, the refactoring should not require significant overhaul to your codebase.

To upgrade your app to integrate with the new v2 Java SDK, you will want to follow this tutorial: https://www.dropbox.com/developers/documentation/java#tutorial.

For complete documentation for the v2 Java SDK, you can check out: https://dropbox.github.io/dropbox-sdk-java/api-docs/v2.1.x/.

Please reach out if you run into issues or need additional clarification.