Question [Q] Loud Speaker Detection Android App

Hey Folks.

I want to know is their any app on Google Play that helps you to detect that other other turned on loud speaker while calling ?

Can any one give me an idea, if we program app like this, how do we detect that other person turned on loud speaker ?

Do we match audio frequency ? Detect Noise ? or any other idea that work good.

I am really thankful if any one can help me.

Thanks
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