If what you're after is WideVine DRM, it's installed by default on all (modern) Android devices, and media players can make use of it transparently. For example, if ExoPlayer bumps into a a DRM-protected MPEG-DASH presentation, it will automatically call into the platform's built-in MediaDrm implementation for license acquisition and for decryption. And this built-in implementation happens to be WideVine for most devices.
If you're after other DRM schemes such as PlayReady, you're out of luck with open-source solutions, and you need to go proprietary.