A2DP Sink was not supported in Android 4.4. We implemented this feature which can be applied in the scenarios below.

You can get the code from https://android-review.googlesource.com/#/c/98161/. We tested the solution on Nexus 5. Our solution includes 3 modules: Bluetooth Stack, SBC Decoder and Audio System which is dependent on the device. If you want to integrate this solution, maybe you have to port Audio System module on your phone. For example, Xperia phone‘s Audio System is different from Nexus 5, so we had to adapt our code in Audio System for Xperia phone.

    If you are interested in A2DP Sink and need support, welcome to discuss with me.

The Implementation of A2DP Sink in Android 4.4