why android 6.0.1 can't hearing caller when i used call recorder

[AC Question]

I try to fix my code, it doesn't hearing caller when i used J2 Prime (or almost android 6). btw, this code is working fine with android 5 and 4. what we need to do more. thx.

 

[ManiacJoe]

What do you mean by "your code"?

Which call recorder app?

 

[Rukbat]

Samsung has gone back and forth over the years between feeding the incoming audio to the API and not feeding it - they're almost famous for that. (Sometimes all you get is a buzz.) It's probably not your code, it's probably Samsung.