Guys, thanks for replaying. It really help.
So here what I did.
Note: I took in consideration of all the following before doing any test: By example: Car battery must full charged, Car is off for few hours so all the electronics goes off, door switch is depressed, etc.

1) I removed the fuses one by one and I found one which is seem to be the cause of the draining the battery. A 15 amp (Multimedia) fuse which for my radio.
2) I then verified all the setting in the radio and turned OFF, some settings. There was one setting that seem to be the cause, which is "Sleep mode setting" -------> "Sleep mode when ACC off", it was set to ON by default. So I turned OFF.
Note: I knew this setting was set to ON by default when I installed the radio back in 2017. And I'm sure I had the draining since 2017 but never noticed because I use to drive to work everyday and alternator charged the battery. Now days I work from home so don't use the car that much. Try to use it everyday but only for 10-15 minutes which is not enough for battery to charge.
3) Shutdown the radio manually from android menu (not sleep, not standby).
4) Let the battery fully charged with Battery Tender Junior.
5) Now, most of the time my draining amps stay between 0.35 - 0.36 amp. When I first touch the multimeter probe, it goes to 0.77-0.80 but then it return quickly to 0.35 - 0.36 amps and stay there (holding for about a minute). Before it use to jump non stop within few seconds.
I think now it it should stop the draining. I will continue doing some tests by turning ON some other setting in my android radio (Except the "Sleep mode when ACC off" will stay OFF). Alternator test is now skipped.
6) I measured the battery voltage and its about 12.93 volts (removed from charge). Will do voltage test tomorrow morning or end of the day to see any drop.


Here is the answer of your questions:
Question: Before installing the 9" touch screen radio, GPS antenna, Backup/reverse camera, alarm system (done by friend). Was everything OK with car battery?
Answer: Probably yes, bought the car in 2014, installed the android radio in 2017. Never had issue until I changed to new battery in October 2020. As I said, I use to go to work everyday, so never had to do jump start. I changed the battery in 0ct 2020 because my old battery was not holding the charge. I removed the old battery from the car, fully charged (12.80 volts), next day it will come down to 7 to 8 Volts just by siting in the garage (nothing connected to the battery). I did all the test before purchasing the new battery.