Why doesn't MediaPlayer work on android 9?

Question

Java

Music streaming won't start on android 9

if (isOnline()) {
            mediaPlayer = new MediaPlayer();
            mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
            try {
                Log.d("STATE_STREAM", "PLAY");
                mediaPlayer.setDataSource(stream);
                mediaPlayer.prepare(); // might take long! (for buffering, etc)
                mediaPlayer.start();
                state = true;
            } catch (IOException e) {
                e.printStackTrace();
            }
        } else {
            Toast.makeText(getApplicationContext(), "Проверьте подключение к интернерту!", Toast.LENGTH_SHORT).show();
        }

Gives an error message