I installed NIPPON NDROID 9PRO 9.1Inch Android 10.1(MCU:T3L) Car Multimedia Player and Alpine external speakers in my vehicle. But not able to control volume programmatically.
I used this code to control volume
audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, \_volume, if (showSystemUI) FLAG_SHOW_UI else 0)
But not able to control. Any specific code to control hardware volume?