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Library Used

PinView

<com.HP.Verification.PinVerificationView

pinView.setOnPinCompleteListener(new PinVerificationView.OnPinCompleteListener() { @Override public void onPinComplete(String pin) { Toast.makeText(MainActivity.this, "Pin entered: " + pin, Toast.LENGTH_SHORT).show();

    // Example: Check if pin is correct
    if (pin.equals("1234")) {
        Toast.makeText(MainActivity.this, "Correct PIN!", Toast.LENGTH_SHORT).show();
    } else {
        pinView.shake(); // Shake animation on wrong PIN
    }
}

});

https://github.com/oyin25/PinViewLib