We applaud new and interesting open source developments that look to find novel ways to solve a problem—things like the Xposed framework and OpenPDroid. It is these sort of projects that exemplify what open source is, and why we at XDA embrace it. It is also for that very same reason why we’re excited about a new open source project, HALO from the creators of the Paranoid Android ROM.
HALO, as previously discussed, brings notifications (conceptually derived from Facebook’s Chat Heads feature) from applications into a floating window and allows you to interact with that application. While this is similar to the Samsung Multi-window functionality, it differs in one key point: It is now open source! Any source-based ROM is able to make use of what the Paranoid Android team has done and bring this functionality to their users with minimal changes. From PA’s Google+ post, the developer of the ROM needs to look at these two commits:
HALO extends Android as it is based on the AOSP source, while also granting app developers the ability to bring the visual aspect to their application. Below is a nice overview of the project and if you like what you see, definitely head on over to the github commits and get involved._________