Accessibility Service onKeyEvent

Question

I'm trying to mute all sounds threw Accessibility Service, is that possible?

if not can I manage the volume keys? I am currently using onKeyEvent to get all volume key events, and it is working fine but I would like to disable the volume keys in a certain condition and enable them in other condition. I have failed to make this happened because it behaves in a strange way which don't listen to my condition and either works or not. The following code is an example of what I got:

@Override public boolean onKeyEvent(KeyEvent event) { int action = event.getAction(); int keyCode = event.getKeyCode(); if(CONDITION) { if (action == KeyEvent.ACTION_UP) { if (keyCode == KeyEvent.KEYCODE_VOLUME_UP || keyCode == KeyEvent.KEYCODE_VOLUME_DOWN) { return false; // Volume key shouldn't work } return true; // execute key normally } } return true; // Volume key should work }

in this case the volume keys don't work no matter what the CONDITION is. and if I change one of the returns to return super.onKeyEvent(event) suddenly the volume key work all the time despite the CONDITION :( I don't know what to do

Please Help, Any advise would help.

Thanks in advance!:)

Your true/false condition is incorrect. From the official web, it said "If true then the event will be consumed and not delivered to applications, otherwise it will be delivered as usual." — Android Newbie A
– Android Newbie A, Commented Nov 15, 2022 at 1:30
So if you don't want the volume up/down events to be taken care by system, you shall return true to "consume" it. REF: developer.android.com/reference/android/accessibilityservice/… — Android Newbie A
– Android Newbie A, Commented Nov 15, 2022 at 1:31
@AndroidNewbieA Hey, I tried it both ways and it didn't work but after debugging I figured the problem was it running twice once on action = ACTION_UP and once on ACTION_DOWN so the volume keys always worked. after changing it to consume both actions it finally worked. Thanks so much for the help! — Kali C
– Kali C, Commented Nov 15, 2022 at 12:26

Kali C · Accepted Answer · 2022-11-15 12:30:46Z

Hey the problem was that the function only consumed the action = ACTION_UP while it triggers both action_up and action_down so the volume keys always worked, now I have changed it to consume both actions and it works! the code is:

@Override public boolean onKeyEvent(KeyEvent event) { int action = event.getAction(); int keyCode = event.getKeyCode(); if(CONDITION) { if (action == KeyEvent.ACTION_UP || action == KeyEvent.ACTION_DOWN) { if (keyCode == KeyEvent.KEYCODE_VOLUME_UP || keyCode == KeyEvent.KEYCODE_VOLUME_DOWN) { return true; // Volume key don't work } } } return false; // Volume keys work }

Hope it helps anyone. :)

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