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The app should include 2 screens:
first screen will capture the index finger touch gesture, similar to the "process" of putting your finger on fingerprint scanner.
You need to press with your index finger pad for few sec.
The result of this screen should give you the height and width of this finger pad press. the height should be more than the width as we are looking for the entire finger pad and not the finger tip only.
second screen should have a test button, that should be recognized as pressed only if pressed by the index finger pad and nothing else.
pressing with the thumb should do nothing.
pressing with the index finder tip should do nothing.
pressing with the index finger pad horizontally should do nothing as well (only vertically press are valid in our test app).
if possible, pressing with other fingers should do nothing as well, but i assume it is difficult as the ring finger and the rest might be very similar to the index finger so this is nice to have request only.
pressing with something else than the finger should do nothing as well.
The UI isn't important here as I will use the logic itself for my own screens, so it doesn't matter how you implement the UI part.