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Modify existing app...can anyone tell me how to do this?

Hello Guys...
I want to programm an android app for my school project.
It needs to detect DTMF Sounds and decode it, and depending on which number was dialed, the whole screen should colorize in a specific colour.
I found an app in the playstore...a DTMF Decoder. https://play.google.com/store/apps/details?id=com.encapsystems.dtmfd&hl=de
so this app already detects and decodes the DTMF signals, and shows which numbers were dialed.
Unfortunately it forcecloses when there's an active call in the background. I guess because both apps want to access the microphone at the same moment?
Can someone tell me, if it's possible to use this app as a fundament, and make my desired app based on it? And maybe stop forceclosing it?
I would be very grateful for any help!
Best Regards, Alex

CSC changing without having to root the phone?

Hello there,
I am new to these issues regarding Samsung phones but hope you can help me out.
My friend from Australia gave me his Samsung Galaxy S6 Edge, SM-G925I from Optus Australia, G925IDVU4FRD3. It has no default recording calls; I tried to add to the CSC file:
( <CscFeature_VoiceCall_ConfigRecording>RecordingAllowed</CscFeature_VoiceCall_ConfigRecording> ) but I am not able to do it because that file ( others.xml at the system folder ) is only read attribute and I can not change it to a readable/written one, without rooting.
I have no idea about rooting the phone and checked on internet but looks way too complicated for me, so I am trying to change the CSC without rooting, is that possible??
Tried this code using the phone dialer: *#243203855# that's to change the country sales code, but nothing happened :crying: .
Tried this another also: *#272*<IMEI># but it's not possible either .
What should I do? I just need to be able to record calls; I know I could install some apps but I would rather use the default Samsung recording calls feature.
I thought installing another firmware from another country but then not sure which country allows recording calls, plus it looks really complex to follow the instructions there :laugh::laugh:
Thank you for your help,
Regards!!
Fras

Recording call root

Hello
I want to activate the call recording on my rooted note 10
I wanted to do like my s8+
https://forum.xda-developers.com/showpost.php?p=72358064&postcount=16
But there is no omc directory in system
Someone know how to do that?
Thank you very much.

Enable built-in call recorder with CSC for DBT (2020-03-01)

Hello, everyone,
i would like to unlock the build-in functionality of the Call Recorder on my Samsung Galaxy S7 (DBT, 2020-03-01).
I have read that this should be possible by modifying the CSC, for example
On the Note 8 we had to edit the cscfeatures.xml with
<CscFeature_VoiceCall_ConfigRecording>RecordingAllowed</CscFeature_VoiceCall_ConfigRecording>
Is this also possible with the S7; if so how?

add in system\csc\other.xml the line u posted.

thanks, it works!

Firmware compatibility

Hello everyone
I've recently receive my note 20 ultra smn986u1
I would like to know if there's any other original firmware that I can download that will have a native call recorder and/or full compatibility with Hebrew language
Thanks

itay81088 said:
Hello everyone
I've recently receive my note 20 ultra smn986u1
I would like to know if there's any other original firmware that I can download that will have a native call recorder and/or full compatibility with Hebrew language
Thanks
Click to expand...
Click to collapse
For that model , I'm affraid not.
Currently the only avenues to explore would be to root and then use a custom rom with call recording functionality perhaps. Or install a 3rd party call recording app.