Android - How to stop other apps playing audio?

I need play some audio through internal speaker.

audioManager.setMode(AudioManager.MODE_IN_CALL);
audioManager.setSpeakerphoneOn(true);

My problem - when i do this, if another app play audio, he start playing too through internal speaker. How i can event it?

I read this topic: How to stop other apps playing music from my current activity? but in my case i want force closing any audio playing.