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It doesn’t send a yes/no signal it sends the fingerprint to be compared to the stored one

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https://developer.android.com/identity/sign-in/biometric-auth#display-login-prompt

The app gets either the onAuthenticationSucceeded or onAuthenticationFailed callback. It doesn’t get the fingerprint.

Edit: I think we are misunderstanding each other, I’m saying that apps never see the fingerprint. The OS does, depending on the device.

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I think we are misunderstanding each other

Exactly

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