Android Native alternative to AirPlay I want to give my old apple TV to my parents because my dad wants to stream files from his ipad to his tv. 2 Months ago I made the Switch from iOS to Android, 1.5 Years ago the switch from MAc to Linux.

So I am now looking for a great alternative to Stream all that Media contents, but at least the Audio/Music from my Android Phone around my small flat (TV, Sound System in Living Room and some small Speakers in my bathroom) 

Is there a native way to do that, such as airplay in the apple world? Would be great, when the receivers would not be as expensive as an apple TV so less then ~100€ and would also work with pulseaudio (ubuntu)

Ah, forgot to mention: It should be weather built in to the core android system or be a future of poweramp to save battery life and not messing around with another daemon.
Google uses Miracast for its media streaming and most recent devices can use it. As for the receiver, recent TVs have Miracast built in. If your TV doesn't have it, there are some adapters on Amazon.