According to a recent commit in the Android Open Source Project tracker, Android smartphones and tablets may gain the ability to stream media between multiple Bluetooth hands-free devices at the same time in Android P – so long as the commit is accepted and merged, that is. It's currently a work in progress, and should be merged at a later stage if all goes according to plan.
In the latest version of Android, Android Oreo, it's impossible to connect to multiple Bluetooth hands-free devices simultaneously, which presents a real challenge for folks who want to stream audio to more than one Bluetooth headset from a single device. There are a lot of use cases (for example, watching a movie or listening to music with another person, or synchronizing music across multiple speakers in different rooms), but it's impossible in AOSP Android.
Source: AOSP Gerrit
If the commit is merged, you can expect support for simultaneous Bluetooth hands-free pairing to make its way to Android P, which in theory will let you listen to two headsets or speakers at the same time on an Android device.
It's the first time we've seen mention of multi-device audio streaming in AOSP, but Samsung implemented a version of it last year in the dual audio feature that launched alongside the Samsung Galaxy S8. It works similarly, letting users connect two different Bluetooth audio devices to the phone and stream audio to both at the same time while letting them control the volume independently of one another. It may sound like something of a niche feature, but it's one of those conveniences you didn't know you needed until you try it.
Right now, it's unclear if Google's take on multi-device Bluetooth streaming will require special hardware, or if current Bluetooth chips in flagship devices will support it. We'll have to wait and see.
from xda-developers https://www.xda-developers.com/android-smartphones-connecting-multiple-bluetooth-hands-free-devices/
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